We develop Attenuated ProPagation of Local Earthquake Shaking (APPLES), a new configuration for the United States West Coast version of the Propagation of Local Undamped Motion (PLUM) earthquake early warning (EEW) algorithm that incorporates attenuation into its ground-motion prediction procedures. Under APPLES, instead of using a fixed radius to forward-predict observed peak ground shaking to the area surrounding a seismic station, the forward-predicted intensity at a location depends on the distance from the station using an intensity prediction relationship. We conduct conceptual tests of maximum intensity distribution predictions in APPLES and PLUM using a catalog of ShakeMaps to confirm that the attenuation relationship in APPLES is appropriately modeling shaking distributions for West Coast earthquakes. Then, we run APPLES and PLUM in simulated real-time tests to determine warning time performance. Finally, we compare real-time alert behavior during the 2022 M6.4 Ferndale, California, earthquake and other recent events. We find that APPLES presents two potential improvements to PLUM by reducing over-alerting during smaller magnitude earthquakes and by increasing warning times in some locations during larger earthquakes. APPLES can produce missed and late alerts in locations that experience shaking intensities close to the level used to issue alerts, so preferred alerting strategies with APPLES would use alert thresholds that are lower than the intensities targeted for EEW alerts. We find alerts using APPLES are also similar to those for the source-based approaches currently used in the ShakeAlert EEW system, which will make APPLES easier to integrate into the system.
\nWe test the behavior of the United States (US) West Coast ShakeAlert earthquake early warning (EEW) system during temporally close earthquake pairs to understand current performance and limitations. We consider performance metrics based on source parameter and ground-motion forecast accuracy, as well as on alerting timeliness. We generate ground-motion times series for synthesized earthquake sequences from real data by combining the signals from pairs of well-recorded earthquakes (4.4≤M≤7.1) using time shifts ranging from −60 to +180 s. We examine fore- and aftershock sequences, near-simultaneous events in different source regions, and simulated out-of-network and offshore earthquakes. We find that the operational ShakeAlert algorithms Earthquake Point-source Integrated Code (EPIC) and Finite-Fault Rupture Detector (FinDer) and the Propagation of Local Undamped Motion (PLUM) method perform largely as expected: EPIC provides the best source location estimates and is often fastest but can underestimate magnitudes or, in extreme cases, miss large earthquakes; FinDer provides real-time line-source models and unsaturated magnitude estimates for large earthquakes but currently cannot process concurrent events and may mislocate offshore earthquakes; PLUM identifies pockets of strong ground motion, but can overestimate alert areas. Implications for system performance are: (1) spatially and temporally close events are difficult to identify separately; (2) challenging scenarios with foreshocks that are close in space and time can lead to missed alerts for large earthquakes; and (3) in these situations the algorithms can often estimate ground motion better than source parameters. To improve EEW, our work suggests revisiting the current algorithm weighting in ShakeAlert, to continue developments that focus on using ground-motion data to aggregate alerts from multiple algorithms, and to investigate methods to optimally leverage algorithm ground-motion estimates. For testing and certification of EEW performance in ShakeAlert and other EEW systems where applicable, we also suggest that 25 of our 73 scenarios become part of the baseline data set.
", "doi": "10.1785/0220220088", "issn": "0895-0695", "publisher": "Seismological Society of America", "publication": "Seismological Research Letters", "publication_date": "2023-01", "series_number": "1", "volume": "94", "issue": "1", "pages": "243-259" }, { "id": "authors:r8k57-m8t03", "collection": "authors", "collection_id": "r8k57-m8t03", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191115-160214215", "type": "article", "title": "CSN-LAUSD Network: A Dense Accelerometer Network in Los Angeles Schools", "author": [ { "family_name": "Clayton", "given_name": "Robert W.", "orcid": "0000-0003-3323-3508", "clpid": "Clayton-R-W" }, { "family_name": "Kohler", "given_name": "Monica D.", "orcid": "0000-0002-4703-190X", "clpid": "Kohler-M-D" }, { "family_name": "Guy", "given_name": "Richard", "orcid": "0000-0002-8651-5608", "clpid": "Guy-Richard" }, { "family_name": "Bunn", "given_name": "Julian J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Heaton", "given_name": "Thomas H.", "orcid": "0000-0003-3363-2197", "clpid": "Heaton-T-H" }, { "family_name": "Chandy", "given_name": "Mani", "orcid": "0000-0001-9190-1290", "clpid": "Chandy-K-M" } ], "abstract": "The Community Seismic Network\u2010Los Angeles Unified School District is a network of 300 low\u2010cost microelectromechanical systems accelerometers located in schools in the Los Angeles, California, region. They are capable of accurately recording strong motion up to \u00b12g and are sufficiently spatially dense that they provide unaliased measurements of strong motions up to 1 Hz following a major earthquake. They are used to provide state\u2010of\u2010health monitoring for the schools and surrounding communities to guide the emergency response. As a research tool, they can be used to provide estimates of the site response at the schools and, therefore, provide a much denser set of site responses for ground\u2010motion prediction than is currently available.", "doi": "10.1785/0220190200", "issn": "0895-0695", "publisher": "Seismological Society of America", "publication": "Seismological Research Letters", "publication_date": "2020-03-01", "series_number": "2A", "volume": "91", "issue": "2A", "pages": "622-630" }, { "id": "authors:a96vj-jnp08", "collection": "authors", "collection_id": "a96vj-jnp08", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190621-152419604", "type": "article", "title": "Event Detection Performance of the PLUM Earthquake Early Warning Algorithm in Southern California", "author": [ { "family_name": "Cochran", "given_name": "Elizabeth S.", "orcid": "0000-0003-2485-4484", "clpid": "Cochran-E-S" }, { "family_name": "Bunn", "given_name": "Julian", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Minson", "given_name": "Sarah E.", "orcid": "0000-0001-5869-3477", "clpid": "Minson-S-E" }, { "family_name": "Baltay", "given_name": "Annemarie S.", "clpid": "Baltay-A-S" }, { "family_name": "Kilb", "given_name": "Deborah L.", "clpid": "Kilb-D-L" }, { "family_name": "Kodera", "given_name": "Yuki", "clpid": "Kodera-Yuki" }, { "family_name": "Hoshiba", "given_name": "Mitsuyuki", "clpid": "Hoshiba-Mitsuyuki" } ], "abstract": "We test the Japanese ground\u2010motion\u2010based earthquake early warning (EEW) algorithm, propagation of local undamped motion (PLUM), in southern California with application to the U.S. ShakeAlert system. In late 2018, ShakeAlert began limited public alerting in Los Angeles to areas of expected modified Mercalli intensity (\u2060I_(MMI\u2060)) 4.0+ for magnitude 5.0+ earthquakes. Most EEW systems, including ShakeAlert, use source\u2010based methods: they estimate the location, magnitude, and origin time of an earthquake from P waves and use a ground\u2010motion prediction equation to identify regions of expected strong shaking. The PLUM algorithm uses observed ground motions directly to define alert areas and was developed to address deficiencies in the Japan Meteorological Agency source\u2010based EEW system during the 2011 Mw 9.0 Tohoku earthquake sequence. We assess PLUM using (a) a dataset of 193 magnitude 3.5+ earthquakes that occurred in southern California between 2012 and 2017 and (b) the ShakeAlert testing and certification suite of 49 earthquakes and other seismic signals. The latter suite includes events that challenge the current ShakeAlert algorithms. We provide a first\u2010order performance assessment using event\u2010based metrics similar to those used by ShakeAlert. We find that PLUM can be configured to successfully issue alerts using I_(MMI) trigger thresholds that are lower than those implemented in Japan. Using two stations, a trigger threshold of I_(MMI) 4.0 for the first station and a threshold of I_(MMI) 2.5 for the second station PLUM successfully detect 12 of 13 magnitude 5.0+ earthquakes and issue no false alerts. PLUM alert latencies were similar to and in some cases faster than source\u2010based algorithms, reducing area that receives no warning near the source that generally have the highest ground motions. PLUM is a simple, independent seismic method that may complement existing source\u2010based algorithms in EEW systems, including the ShakeAlert system, even when alerting to light (\u2060I_(MMI) 4.0) or higher ground\u2010motion levels.", "doi": "10.1785/0120180326", "issn": "0037-1106", "publisher": "Seismological Society of America", "publication": "Bulletin of the Seismological Society of America", "publication_date": "2019-08-01", "series_number": "4", "volume": "109", "issue": "4", "pages": "1524-1541" }, { "id": "authors:v7ep2-5na49", "collection": "authors", "collection_id": "v7ep2-5na49", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190620-083908383", "type": "article", "title": "Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at \u221as = 8 and 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The results of a search for a standard model-like Higgs boson in the mass range between 70 and 110\u202fGeV decaying into two photons are presented. The analysis uses the data set collected with the CMS experiment in proton-proton collisions during the 2012 and 2016 LHC running periods. The data sample corresponds to an integrated luminosity of 19.7 (35.9)fb^(\u22121) at \u221as = 8 (13)\u202fTeV. The expected and observed 95% confidence level upper limits on the product of the cross section and branching fraction into two photons are presented. The observed upper limit for the 2012 (2016) data set ranges from 129 (161) fb to 31 (26) fb. The statistical combination of the results from the analyses of the two data sets in the common mass range between 80 and 110\u202fGeV yields an upper limit on the product of the cross section and branching fraction, normalized to that for a standard model-like Higgs boson, ranging from 0.7 to 0.2, with two notable exceptions: one in the region around the Z boson peak, where the limit rises to 1.1, which may be due to the presence of Drell\u2013Yan dielectron production where electrons could be misidentified as isolated photons, and a second due to an observed excess with respect to the standard model prediction, which is maximal for a mass hypothesis of 95.3\u202fGeV with a local (global) significance of 2.8 (1.3) standard deviations.", "doi": "10.1016/j.physletb.2019.03.064", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2019-06-10", "volume": "793", "pages": "320-347" }, { "id": "authors:4cy3z-0cj24", "collection": "authors", "collection_id": "4cy3z-0cj24", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190530-071443758", "type": "article", "title": "Measurement of inclusive very forward jet cross sections in proton-lead collisions at \u221as_(NN) = 5.02 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of differential cross sections for inclusive very forward jet production in proton-lead collisions as a function of jet energy are presented. The data were collected with the CMS experiment at the LHC in the laboratory pseudorapidity range \u22126.6 < \u03b7 < \u22125.2. Asymmetric beam energies of 4 TeV for protons and 1.58 TeV per nucleon for Pb nuclei were used, corresponding to a center-of-mass energy per nucleon pair of \u221as_(NN) = 5.02 TeV. Collisions with either the proton (p+Pb) or the ion (Pb+p) traveling towards the negative \u03b7 hemisphere are studied. The jet cross sections are unfolded to stable-particle level cross sections with p_T \u2273 3 GeV, and compared to predictions from various Monte Carlo event generators. In addition, the cross section ratio of p+Pb and Pb+p data is presented. The results are discussed in terms of the saturation of gluon densities at low fractional parton momenta. None of the models under consideration describes all the data over the full jet-energy range and for all beam configurations. Discrepancies between the differential cross sections in data and model predictions of more than two orders of magnitude are observed.", "doi": "10.1007/JHEP05(2019)043", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2019-05", "series_number": "5", "volume": "2019", "issue": "5", "pages": "Art. No. 43" }, { "id": "authors:qsx2n-wx288", "collection": "authors", "collection_id": "qsx2n-wx288", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190321-073101150", "type": "article", "title": "Measurement of nuclear modification factors of \u03d2(1S), \u03d2(2S), and \u03d2(3S) mesons in PbPb collisions at \u221as_(NN) = 5.02 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Dutta", "given_name": "I.", "clpid": "Dutta-I" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The cross sections for \u03d2(1S), \u03d2(2S), and \u03d2(3S) production in lead\u2013lead (PbPb) and proton\u2013proton (pp) collisions at \u221as_(NN) = 5.02 TeV have been measured using the CMS detector at the LHC. The nuclear modification factors, R_(AA), derived from the PbPb-to-pp ratio of yields for each state, are studied as functions of meson rapidity and transverse momentum, as well as PbPb collision centrality. The yields of all three states are found to be significantly suppressed, and compatible with a sequential ordering of the suppression, R_(AA)(\u03d2(1S)) > R_(AA)(\u03d2(2S)) > R_(AA)(\u03d2(3S)). The suppression of \u03d2(1S) is larger than that seen at \u221as_(NN) = 2.76 TeV, although the two are compatible within uncertainties. The upper limit on the R_(AA) of \u03d2(3S) integrated over p_T, rapidity and centrality is 0.096 at 95% confidence level, which is the strongest suppression observed for a quarkonium state in heavy ion collisions to date.", "doi": "10.1016/j.physletb.2019.01.006", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2019-03-10", "volume": "790", "pages": "270-293" }, { "id": "authors:ekmtm-5j947", "collection": "authors", "collection_id": "ekmtm-5j947", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190321-081246207", "type": "article", "title": "Measurement of prompt \u03c8(2S) production cross sections in proton\u2013lead and proton\u2013proton collisions at \u221as_(NN) = 5.02 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of prompt \u03c8(2S) meson production cross sections in proton\u2013lead (pPb) and proton\u2013proton (pp) collisions at a nucleon\u2013nucleon center-of-massenergy of \u221as_(NN) = 5.02 TeV are reported. The results are based on pPb and pp data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 34.6 nb^(\u22121) and 28.0 pb^(\u22121), respectively. The nuclear modification factor RpPb is measured for prompt \u03c8(2S) in the transverse momentum range 4 < p_T < 30 GeV/c and the center-of-mass rapidity range \u22122.4 < yCM < 1.93. The results on \u03c8(2S) RpPb are compared to the corresponding modification factor for prompt J/\u03c8 mesons. The results point to different nuclear effects at play in the production of the excited charmonium state compared to the ground state, in the region of backward rapidity and for p_T < 10 GeV/c.", "doi": "10.1016/j.physletb.2019.01.058", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2019-03-10", "volume": "790", "pages": "509-532" }, { "id": "authors:4gwje-q4083", "collection": "authors", "collection_id": "4gwje-q4083", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190204-102500767", "type": "article", "title": "Search for the Higgs Boson Decaying to Two Muons in Proton-Proton Collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the Higgs boson decaying to two oppositely charged muons is presented using data recorded by the CMS experiment at the CERN LHC in 2016 at a center-of-mass energy \u221as = 13\u2009\u2009TeV, corresponding to an integrated luminosity of 35.9\u2009\u2009fb^(-1). Data are found to be compatible with the predicted background. For a Higgs boson with a mass of 125.09 GeV, the 95% confidence level observed (background-only expected) upper limit on the production cross section times the branching fraction to a pair of muons is found to be 3.0 (2.5) times the standard model expectation. In combination with data recorded at center-of-mass energies \u221as = 7 and 8 TeV, the background-only expected upper limit improves to 2.2 times the standard model value with a standard model expected significance of 1.0 standard deviation. The corresponding observed upper limit is 2.9 with an observed significance of 0.9 standard deviation. This corresponds to an observed upper limit on the standard model Higgs boson branching fraction to muons of 6.4\u00d710^(-4) and to an observed signal strength of 1.0\u00b11.0(stat)\u00b10.1(syst).", "doi": "10.1103/PhysRevLett.122.021801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2019-01-18", "series_number": "2", "volume": "122", "issue": "2", "pages": "Art. No. 021801" }, { "id": "authors:3apem-dpj66", "collection": "authors", "collection_id": "3apem-dpj66", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190204-081358683", "type": "article", "title": "Search for Higgs boson pair production in the \u03b3\u03b3bb final state in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Dutta", "given_name": "I.", "clpid": "Dutta-I" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for the production of a pair of Higgs bosons, where one decays into two photons and the other one into a bottom quark\u2013antiquark pair. The analysis is performed using proton\u2013proton collision data at \u221as = 13 TeV recorded in 2016 by the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9fb^(-1). The results are in agreement with standard model (SM) predictions. In a search for resonant production, upper limits are set on the cross section for new spin-0 or spin-2 particles. For the SM-like nonresonant production hypothesis, the data exclude a product of cross section and branching fraction larger than 2.0fb at 95% confidence level (CL), corresponding to about 24 times the SM prediction. Values of the effective Higgs boson self-coupling \u03ba_\u03bb are constrained to be within the range \u221211 < \u03ba_\u03bb < 17 at 95% CL, assuming all other Higgs boson couplings are at their SM value. The constraints on \u03ba_\u03bb are the most restrictive to date.", "doi": "10.1016/j.physletb.2018.10.056", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2019-01-10", "volume": "788", "pages": "7-36" }, { "id": "authors:2fgkt-qpt32", "collection": "authors", "collection_id": "2fgkt-qpt32", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190207-132345046", "type": "article", "title": "Search for heavy resonances decaying into two Higgs bosons or into a Higgs boson and a W or Z boson in proton-proton collisions at 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for massive narrow resonances decaying either into two Higgs bosons, or into a Higgs boson and a W or Z boson. The decay channels considered are HH\u2192bb \u03c4^+\u03c4^\u2212 and VH\u2192qq \u03c4^+\u03c4^\u2212 , where H denotes the Higgs boson, and V denotes the W or Z boson. This analysis is based on a data sample of proton-proton collisions collected at a center-of-mass energy of 13 TeV by the CMS Collaboration, corresponding to an integrated luminosity of 35.9 fb^(\u22121). For the TeV-scale mass resonances considered, substructure techniques provide ways to differentiate among the hadronization products from vector boson decays to quarks, Higgs boson decays to bottom quarks, and quark- or gluon-induced jets. Reconstruction techniques are used that have been specifically optimized to select events in which the tau lepton pair is highly boosted. The observed data are consistent with standard model expectations and upper limits are set at 95% confidence level on the product of cross section and branching fraction for resonance masses between 0.9 and 4.0 TeV. Exclusion limits are set in the context of bulk radion and graviton models:spin-0 radion resonances are excluded below a mass of 2.7 TeV at 95% confidence level. In the spin-1 heavy vector triplet framework, mass-degenerate W\u2032 and Z\u2032 resonances with dominant couplings to the standard model gauge bosons are excluded below a mass of 2.8 TeV at 95% confidence level. These are the first limits for massive resonances at the TeV scale with these decay channels at \u221as = 13 TeV.", "doi": "10.1007/JHEP01(2019)051", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2019-01", "series_number": "1", "volume": "2019", "issue": "1", "pages": "Art. No. 51" }, { "id": "authors:8jq65-4sn37", "collection": "authors", "collection_id": "8jq65-4sn37", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190103-130033571", "type": "article", "title": "Observation of Medium-Induced Modifications of Jet Fragmentation in Pb-Pb Collisions at \u221as_(NN) = 5.02\u2009\u2009TeV Using Isolated Photon-Tagged Jets", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Dutta", "given_name": "I.", "clpid": "Dutta-I" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of fragmentation functions for jets associated with an isolated photon are presented for the first time in pp and Pb-Pb collisions. The analysis uses data collected with the CMS detector at the CERN LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Fragmentation functions are obtained for jets with p^(jet)_T > 30\u2009\u2009GeV/c in events containing an isolated photon with p^\u03b3_T > 60\u2009\u2009GeV/c, using charged tracks with transverse momentum p^(trk)_T > 1\u2009\u2009GeV/c in a cone around the jet axis. The association with an isolated photon constrains the initial pT and azimuthal angle of the parton whose shower produced the jet. For central Pb-Pb collisions, modifications of the jet fragmentation functions are observed when compared to those measured in pp collisions, while no significant differences are found in the 50% most peripheral collisions. Jets in central Pb-Pb events show an excess (depletion) of low (high) p_T particles, with a transition around 3\u2009\u2009GeV/c. This measurement shows for the first time the in-medium shower modifications of partons (quark dominated) with well-defined initial kinematics. It constitutes a new well-controlled reference for testing theoretical models of the parton passage through the quark-gluon plasma.", "doi": "10.1103/PhysRevLett.121.242301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2018-12-14", "series_number": "24", "volume": "121", "issue": "24", "pages": "Art. No. 242301" }, { "id": "authors:d7f15-yd082", "collection": "authors", "collection_id": "d7f15-yd082", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190107-083931961", "type": "article", "title": "Measurements of Higgs boson properties in the diphoton decay channel in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of Higgs boson properties in the H \u2192 \u03b3\u03b3 decay channel are reported. The analysis is based on data collected by the CMS experiment in proton-proton collisions at \u221as = 13 TeV during the 2016 LHC running period, corresponding to an integrated luminosity of 35.9 fb^(\u22121). Allowing the Higgs mass to float, the measurement yields a signal strength relative to the standard model prediction of 1.18_(\u2212\u20090.14)^(+\u20090.17) \u2009=\u20091.18_(\u2212\u20090.11)^(+\u20090.12)(stat)_(\u2212\u20090.07)^(+\u20090.09)(syst)_(\u2212\u20090.06)^(+\u20090.07)(theo), which is largely insensitive to the exact Higgs mass around 125 GeV. Signal strengths associated with the different Higgs boson production mechanisms, couplings to bosons and fermions, and effective couplings to photons and gluons are also measured.", "doi": "10.1007/JHEP11(2018)185", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-11", "series_number": "11", "volume": "2018", "issue": "11", "pages": "Art. No. 185" }, { "id": "authors:38z5b-cn112", "collection": "authors", "collection_id": "38z5b-cn112", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181221-100009150", "type": "article", "title": "Measurement of differential cross sections for Z boson production in association with jets in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of a Z boson, decaying to two charged leptons, in association with jets in proton-proton collisions at a centre-of-mass energy of 13 TeV is measured. Data recorded with the CMS detector at the LHC are used that correspond to an integrated luminosity of 2.19fb^(-1). The cross section is measured as a function of the jet multiplicity and its dependence on the transverse momentum of the Z boson, the jet kinematic variables (transverse momentum and rapidity), the scalar sum of the jet momenta, which quantifies the hadronic activity, and the balance in transverse momentum between the reconstructed jet recoil and the Z boson. The measurements are compared with predictions from four different calculations. The first two merge matrix elements with different parton multiplicities in the final state and parton showering, one of which includes one-loop corrections. The third is a fixed-order calculation with next-to-next-to-leading order accuracy for the process with a Z boson and one parton in the final state. The fourth combines the fully differential next-to-next-to-leading order calculation of the process with no parton in the final state with next-to-next-to-leading logarithm resummation and parton showering.", "doi": "10.1140/epjc/s10052-018-6373-0", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2018-11", "series_number": "11", "volume": "78", "issue": "11", "pages": "Art. No. 965" }, { "id": "authors:9zvwn-npr98", "collection": "authors", "collection_id": "9zvwn-npr98", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181115-074352323", "type": "article", "title": "Precision measurement of the structure of the CMS inner tracking system using nuclear interactions", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The structure of the CMS inner tracking system has been studied using nuclear interactions of hadrons striking its material. Data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded in 2015 at the LHC are used to reconstruct millions of secondary vertices from these nuclear interactions. Precise positions of the beam pipe and the inner tracking system elements, such as the pixel detector support tube, and barrel pixel detector inner shield and support rails, are determined using these vertices. These measurements are important for detector simulations, detector upgrades, and to identify any changes in the positions of inactive elements.", "doi": "10.1088/1748-0221/13/10/P10034", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2018-10", "series_number": "10", "volume": "13", "issue": "10", "pages": "Art. No. P10034" }, { "id": "authors:6ttfa-c5w05", "collection": "authors", "collection_id": "6ttfa-c5w05", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181108-152018821", "type": "article", "title": "Measurement of the production cross section for single top quarks in association with W bosons in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the associated production of a single top quark and a W boson in proton-proton collisions at \u221as = 13 TeV by the CMS Collaboration at the CERN LHC. The data collected corresponds to an integrated luminosity of 35.9 fb^(-1). The measurement is performed using events with one electron and one muon in the final state along with at least one jet originated from a bottom quark. A multivariate discriminant, exploiting the kinematic properties of the events, is used to separate the signal from the dominant tttt background. The measured cross section of 63.1 \u00b1 1.8(stat) \u00b1 6.4(syst) \u00b1 2.1 (lumi) pb is in agreement with the standard model expectation.", "doi": "10.1007/JHEP10(2018)117", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-10", "series_number": "10", "volume": "2018", "issue": "10", "pages": "Art. No. 117" }, { "id": "authors:70avk-azn53", "collection": "authors", "collection_id": "70avk-azn53", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180921-080352644", "type": "article", "title": "Search for additional neutral MSSM Higgs bosons in the \u03c4\u03c4 final state in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for additional neutral Higgs bosons in the \u03c4\u03c4 final state in proton-proton collisions at the LHC. The search is performed in the context of the minimal supersymmetric extension of the standard model (MSSM), using the data collected with the CMS detector in 2016 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb^(\u22121). To enhance the sensitivity to neutral MSSM Higgs bosons, the search includes production of the Higgs boson in association with b quarks. No significant deviation above the expected background is observed. Model-independent limits at 95% confidence level (CL) are set on the product of the branching fraction for the decay into \u03c4 leptons and the cross section for the production via gluon fusion or in association with b quarks. These limits range from 18 pb at 90 GeV to 3.5 fb at 3.2 TeV for gluon fusion and from 15 pb (at 90 GeV) to 2.5 fb (at 3.2 TeV) for production in association with b quarks, assuming a narrow width resonance. In the m_h^(hod\u2009+) scenario these limits translate into a 95% CL exclusion of tan \u03b2 > 6 for neutral Higgs boson masses below 250 GeV, where tan \u03b2 is the ratio of the vacuum expectation values of the neutral components of the two Higgs doublets. The 95% CL exclusion contour reaches 1.6 TeV for tan \u03b2= 60.", "doi": "10.1007/JHEP09(2018)007", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-09", "series_number": "9", "volume": "2018", "issue": "9", "pages": "Art. No. 007" }, { "id": "authors:0mpjp-3q106", "collection": "authors", "collection_id": "0mpjp-3q106", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180920-090424497", "type": "article", "title": "Measurement of charged particle spectra in minimum-bias events from proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Pseudorapidity, transverse momentum, and multiplicity distributions are measured in the pseudorapidity range |\u03b7| < 2.4 for charged particles with transverse momenta satisfying p_T > 0.5 GeV in proton\u2013proton collisions at a center-of-mass energy of \u221as = 13 TeV. Measurements are presented in three different event categories. The most inclusive of the categories corresponds to an inelastic pp data set, while the other two categories are exclusive subsets of the inelastic sample that are either enhanced or depleted in single diffractive dissociation events. The measurements are compared to predictions from Monte Carlo event generators used to describe high-energy hadronic interactions in collider and cosmic-ray physics.", "doi": "10.1140/epjc/s10052-018-6144-y", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2018-09", "series_number": "9", "volume": "78", "issue": "9", "pages": "Art. No. 697" }, { "id": "authors:fp7sh-z2v32", "collection": "authors", "collection_id": "fp7sh-z2v32", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181011-132404084", "type": "article", "title": "Search for a heavy resonance decaying into a Z boson and a Z or W boson in 2\u21132q final states at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search has been performed for heavy resonances decaying to ZZ or ZW in 2\u21132q final states, with two charged leptons (\u2113 = e, \u03bc) produced by the decay of a Z boson, and two quarks produced by the decay of a W or Z boson. The analysis is sensitive to resonances with masses in the range from 400 to 4500 GeV. Two categories are defined based on the merged or resolved reconstruction of the hadronically decaying vector boson, optimized for high- and low-mass resonances, respectively. The search is based on data collected during 2016 by the CMS experiment at the LHC in proton-proton collisions with a center-of-mass energy of \u221as = 13 TeV, corresponding to an integrated luminosity of 35.9 fb^(\u22121). No excess is observed in the data above the standard model background expectation. Upper limits on the production cross section of heavy, narrow spin-1 and spin-2 resonances are derived as a function of the resonance mass, and exclusion limits on the production of W\u2032 bosons and bulk graviton particles are calculated in the framework of the heavy vector triplet model and warped extra dimensions, respectively.", "doi": "10.1007/JHEP09(2018)101", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-09", "series_number": "9", "volume": "2018", "issue": "9", "pages": "Art. No. 101" }, { "id": "authors:w84c5-8h290", "collection": "authors", "collection_id": "w84c5-8h290", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180927-074347560", "type": "article", "title": "Measurement of the Z/\u03b3\u2217 \u2192 \u03c4\u03c4 cross section in pp collisions at \u221as = 13 TeV and validation of \u03c4 lepton analysis techniques", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the Z/\u03b3\u2217 \u2192 \u03c4\u03c4 cross section in pp collisions at \u221as = 13 TeV, using data recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 2.3 fb^(\u22121). The product of the inclusive cross section and branching fraction is measured to be \u03c3(pp \u2192 Z/\u03b3\u2217 + X)B(Z/\u03b3\u2217 \u2192 \u03c4\u03c4) = 1848 \u00b1 12(stat) \u00b1 67 (syst \\,+\\,lumi) pb, in agreement with the standard model expectation, computed at next-to-next-to-leading order accuracy in perturbative quantum chromodynamics. The measurement is used to validate new analysis techniques relevant for future measurements of \u03c4 lepton production. The measurement also provides the reconstruction efficiency and energy scale for \u03c4 decays to hadrons + \u03bd_\u03c4 final states, determined with respective relative uncertainties of 2.2 and 0.9%.", "doi": "10.1140/epjc/s10052-018-6146-9", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2018-09", "series_number": "9", "volume": "78", "issue": "9", "pages": "Art. No. 708" }, { "id": "authors:9x4af-etb74", "collection": "authors", "collection_id": "9x4af-etb74", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180928-082959021", "type": "article", "title": "Search for third-generation scalar leptoquarks decaying to a top quark and a \u03c4 lepton at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair production of heavy scalar leptoquarks (LQs), each decaying into a top quark and a \u03c4 lepton, is presented. The search considers final states with an electron or a muon, one or two \u03c4 leptons that decayed to hadrons, and additional jets. The data were collected in 2016 in proton\u2013proton collisions at \u221as = 13 TeV with the CMS detector at the LHC, and correspond to an integrated luminosity of 35.9fb^(\u22121). No evidence for pair production of LQs is found. Assuming a branching fraction of unity for the decay LQ \u2192 t\u03c4, upper limits on the production cross section are set as a function of LQ mass, excluding masses below 900GeV at 95% confidence level. These results provide the most stringent limits to date on the production of scalar LQs that decay to a top quark and a \u03c4 lepton.", "doi": "10.1140/epjc/s10052-018-6143-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2018-09", "series_number": "9", "volume": "78", "issue": "9", "pages": "Art. No. 707" }, { "id": "authors:zk9xh-w3395", "collection": "authors", "collection_id": "zk9xh-w3395", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180920-091856019", "type": "article", "title": "Measurement of the weak mixing angle using the forward\u2013backward asymmetry of Drell\u2013Yan events in pp collisions at 8 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the effective leptonic weak mixing angle (sin^2\u03b8^\u2113_(eff) using the forward\u2013backward asymmetry of Drell\u2013Yan lepton pairs (\u03bc\u03bc and ee) produced in proton\u2013proton collisions at \u221as = 8 TeV at the CMS experiment of the LHC. The data correspond to integrated luminosities of 18.8 and 19.6fb^(-1) in the dimuon and dielectron channels, respectively, containing 8.2 million dimuon and 4.9 million dielectron events. With more events and new analysis techniques, including constraints obtained on the parton distribution functions from the measured forward\u2013backward asymmetry, the statistical and systematic uncertainties are significantly reduced relative to previous CMS measurements. The extracted value of sin^2\u03b8^\u2113_(eff) from the combined dilepton data is sin^2\u03b8^\u2113_(eff) = 0.23101 \u00b1 0.00036(stat) \u00b1 0.00018(syst) \u00b1 0.00016(theo) \u00b1 0.00031(parton distributions in proton) = 0.23101 \u00b1 0.00053.", "doi": "10.1140/epjc/s10052-018-6148-7", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2018-09", "series_number": "9", "volume": "78", "issue": "9", "pages": "Art. No. 701" }, { "id": "authors:a41kv-pz143", "collection": "authors", "collection_id": "a41kv-pz143", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181018-082702498", "type": "article", "title": "Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the pair production of the lightest supersymmetric partner of the top quark (t_1) is presented. The search focuses on a compressed scenario where the mass difference between the top squark and the lightest supersymmetric particle, often considered to be the lightest neutralino (\u03c7^0_1), is smaller than the mass of the W boson. The proton-proton collision data were recorded by the CMS experiment at a centre-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 35.9 fb^(\u22121). In this search, two decay modes of the top squark are considered: a four-body decay into a bottom quark, two additional fermions, and a \u03c7^0_1; and a decay via an intermediate chargino. Events are selected using the presence of a high-momentum jet, significant missing transverse momentum, and a low transverse momentum electron or muon. Two analysis techniques are used, targeting different decay modes of the t_1: a sequential selection and a multivariate technique. No evidence for the production of top squarks is found, and mass limits at 95% confidence level are set that reach up to 560 GeV, depending on the m(t_1)\u2212m(\u03c7^0_1) mass difference and the decay mode.", "doi": "10.1007/JHEP09(2018)065", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-09", "series_number": "9", "volume": "2018", "issue": "9", "pages": "Art. No. 065" }, { "id": "authors:h9hdz-80n48", "collection": "authors", "collection_id": "h9hdz-80n48", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180920-074101293", "type": "article", "title": "Search for R-parity violating supersymmetry in pp collisions at \u221as = 13 TeV using b jets in a final state with a single lepton, many jets, and high sum of large-radius jet masses", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Dutta", "given_name": "I.", "clpid": "Dutta-I" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported from a search for physics beyond the standard model in proton\u2013proton collisions at a center-of-mass energy of \u221as = 13 TeV. The search uses a signature of a single lepton, large jet and bottom quark jet multiplicities, and high sum of large-radius jet masses, without any requirement on the missing transverse momentum in an event. The data sample corresponds to an integrated luminosity of 35.9\u2009fb^(\u22121) recorded by the CMS experiment at the LHC. No significant excess beyond the prediction from standard model processes is observed. The results are interpreted in terms of upper limits on the production cross section for R-parity violating supersymmetric extensions of the standard model using a benchmark model of gluino pair production, in which each gluino decays promptly via g\u02dc\u2192 tbs. Gluinos with a mass below 1610\u202fGeV are excluded at 95% confidence level.", "doi": "10.1016/j.physletb.2018.06.028", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2018-08-10", "volume": "783", "pages": "114-139" }, { "id": "authors:0d5jz-jyd79", "collection": "authors", "collection_id": "0d5jz-jyd79", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180921-091956769", "type": "article", "title": "Search for narrow and broad dijet resonances in proton-proton collisions at \u221as = 13 TeV and constraints on dark matter mediators and other new particles", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Searches for resonances decaying into pairs of jets are performed using proton-proton collision data collected at \u221as = 13 TeV corresponding to an integrated luminosity of up to 36 fb^(\u22121). A low-mass search, for resonances with masses between 0.6 and 1.6 TeV, is performed based on events with dijets reconstructed at the trigger level from calorimeter information. A high-mass search, for resonances with masses above 1.6 TeV, is performed using dijets reconstructed offline with a particle-flow algorithm. The dijet mass spectrum is well described by a smooth parameterization and no evidence for the production of new particles is observed. Upper limits at 95% confidence level are reported on the production cross section for narrow resonances with masses above 0.6 TeV. In the context of specific models, the limits exclude string resonances with masses below 7.7 TeV, scalar diquarks below 7.2 TeV, axigluons and colorons below 6.1 TeV, excited quarks below 6.0 TeV, color-octet scalars below 3.4 TeV, W\u2032 bosons below 3.3 TeV, Z\u2032 bosons below 2.7 TeV, Randall-Sundrum gravitons below 1.8 TeV and in the range 1.9 to 2.5 TeV, and dark matter mediators below 2.6 TeV. The limits on both vector and axial-vector mediators, in a simplified model of interactions between quarks and dark matter particles, are presented as functions of dark matter particle mass and coupling to quarks. Searches are also presented for broad resonances, including for the first time spin-1 resonances with intrinsic widths as large as 30% of the resonance mass. The broad resonance search improves and extends the exclusions of a dark matter mediator to larger values of its mass and coupling to quarks.", "doi": "10.1007/JHEP08(2018)130", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-08", "series_number": "8", "volume": "2018", "issue": "8", "pages": "Art. No. 130" }, { "id": "authors:xb54y-6cp33", "collection": "authors", "collection_id": "xb54y-6cp33", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180921-105609097", "type": "article", "title": "Search for vector-like T and B quark pairs in final states with leptons at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for pair production of heavy vector-like T and B quarks in proton-proton collisions at \u221as = 13 TeV. The data sample corresponds to an integrated luminosity of 35.9 fb^(\u22121), collected with the CMS detector at the CERN LHC in 2016. Pair production of T quarks would result in a wide range of final states, since vector-like T quarks of charge 2e/3 are predicted to decay to bW, tZ, and tH. Likewise, vector-like B quarks are predicted to decay to tW, bZ, and bH. Three channels are considered, corresponding to final states with a single lepton, two leptons with the same sign of the electric charge, or at least three leptons. The results exclude T quarks with masses below 1140\u20131300 GeV and B quarks with masses below 910\u20131240 GeV for various branching fraction combinations, extending the reach of previous CMS searches by 200\u2013600 GeV.", "doi": "10.1007/JHEP08(2018)177", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-08", "series_number": "8", "volume": "2018", "issue": "8", "pages": "Art. No. 177" }, { "id": "authors:pkjff-4yy47", "collection": "authors", "collection_id": "pkjff-4yy47", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180920-084214611", "type": "article", "title": "Evidence for associated production of a Higgs boson with a top quark pair in final states with electrons, muons, and hadronically decaying \u03c4 leptons at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results of a search for the standard model Higgs boson produced in association with a top quark pair (tt\u00afHtt\u00afH) in final states with electrons, muons, and hadronically decaying \u03c4 leptons are presented. The analyzed data set corresponds to an integrated luminosity of 35.9 fb^(\u22121) recorded in proton-proton collisions at \u221as = 13 TeV by the CMS experiment in 2016. The sensitivity of the search is improved by using matrix element and machine learning methods to separate the signal from backgrounds. The measured signal rate amounts to 1.23_(\u2212\u20090.43)^(+\u20090.45) times the production rate expected in the standard model, with an observed (expected) significance of 3.2\u03c3 (2.8\u03c3), which represents evidence for tt\u00afH production in those final states. An upper limit on the signal rate of 2.1 times the standard model production rate is set at 95% confidence level.", "doi": "10.1007/JHEP08(2018)066", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-08", "series_number": "8", "volume": "2018", "issue": "8", "pages": "Art. No. 66" }, { "id": "authors:f1jcz-96s48", "collection": "authors", "collection_id": "f1jcz-96s48", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180921-100005052", "type": "article", "title": "Search for resonant pair production of Higgs bosons decaying to bottom quark-antiquark pairs in proton-proton collisions at 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a narrow-width resonance decaying into two Higgs bosons, each decaying into a bottom quark-antiquark pair, is presented. The search is performed using proton-proton collision data corresponding to an integrated luminosity of 35.9 fb^(\u22121) at \u221as = 13 TeV recorded by the CMS detector at the LHC. No evidence for such a signal is observed. Upper limits are set on the product of the production cross section for the resonance and the branching fraction for the selected decay mode in the resonance mass range from 260 to 1200 GeV.", "doi": "10.1007/JHEP08(2018)152", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-08", "series_number": "8", "volume": "2018", "issue": "8", "pages": "Art. No. 152" }, { "id": "authors:fzwfx-dk975", "collection": "authors", "collection_id": "fzwfx-dk975", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180921-084411770", "type": "article", "title": "Search for beyond the standard model Higgs bosons decaying into a bb pair in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for Higgs bosons that decay into a bottom quark-antiquark pair and are accompanied by at least one additional bottom quark is performed with the CMS detector. The data analyzed were recorded in proton-proton collisions at a centre-of-mass energy of \u221as = 13 TeV at the LHC, corresponding to an integrated luminosity of 35.7 fb^(\u22121). The final state considered in this analysis is particularly sensitive to signatures of a Higgs sector beyond the standard model, as predicted in the generic class of two Higgs doublet models (2HDMs). No signal above the standard model background expectation is observed. Stringent upper limits on the cross section times branching fraction are set for Higgs bosons with masses up to 1300 GeV. The results are interpreted within several MSSM and 2HDM scenarios.", "doi": "10.1007/JHEP08(2018)113", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-08", "series_number": "8", "volume": "2018", "issue": "8", "pages": "Art. No. 113" }, { "id": "authors:5qkge-5d584", "collection": "authors", "collection_id": "5qkge-5d584", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180802-083728551", "type": "article", "title": "Search for new physics in events with two soft oppositely charged leptons and missing transverse momentum in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Dutta", "given_name": "I.", "clpid": "Dutta-I" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for new physics in events with two low-momentum, oppositely charged leptons (electrons or muons) and missing transverse momentum in proton-proton collisions at a centre-of-mass energy of 13\u202fTeV. The data collected using the CMS detector at the LHC correspond to an integrated luminosity of 35.9fb^(-1). The observed event yields are consistent with the expectations from the standard model. The results are interpreted in terms of pair production of charginos and neutralinos (\u03c7\u02dc_1^\u00b1 and \u03c7\u02dc_2^0) with nearly degenerate masses, as expected in natural supersymmetry models with light higgsinos, as well as in terms of the pair production of top squarks (t\u02dc), when the lightest neutralino and the top squark have similar masses. At 95% confidence level, wino-like \u03c7\u02dc_1^\u00b1/\u03c7\u02dc_2^0 masses are excluded up to 230\u202fGeV for a mass difference of 20\u202fGeV relative to the lightest neutralino. In the higgsino-like model, masses are excluded up to 168\u202fGeV for the same mass difference. For t\u02dc pair production, top squark masses up to 450\u202fGeV are excluded for a mass difference of 40\u202fGeV relative to the lightest neutralino.", "doi": "10.1016/j.physletb.2018.05.062", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2018-07-10", "volume": "782", "pages": "440-467" }, { "id": "authors:kvhz5-4nn86", "collection": "authors", "collection_id": "kvhz5-4nn86", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180817-074447576", "type": "article", "title": "Measurement of the inelastic proton-proton cross section at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the inelastic proton-proton cross section with the CMS detector at a center-of-mass energy of \u221as = 13 TeV is presented. The analysis is based on events with energy deposits in the forward calorimeters, which cover pseudorapidities of \u22126.6 < \u03b7 < \u22123.0 and +3.0 < \u03b7 < +5.2. An inelastic cross section of 68.6 \u00b1 0.5(syst) \u00b1 1.6(lumi) mb is obtained for events with M_X > 4.1 GeV and/or M_Y > 13 GeV, where M_X and M_Y are the masses of the diffractive dissociation systems at negative and positive pseudorapidities, respectively. The results are compared with those from other experiments as well as to predictions from high-energy hadron-hadron interaction models.", "doi": "10.1007/JHEP07(2018)161", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-07", "series_number": "7", "volume": "2018", "issue": "7", "pages": "Art. No. 161" }, { "id": "authors:9tt20-0z688", "collection": "authors", "collection_id": "9tt20-0z688", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180817-100431335", "type": "article", "title": "Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" }, { "literal": "TOTEM Collaboration" } ], "abstract": "The process pp \u2192 p\u2113^+\u2113^\u2212p(*), with \u2113^+\u2113^\u2212 a muon or an electron pair produced at midrapidity with mass larger than 110 GeV, has been observed for the first time at the LHC in pp collisions at \u221as = 13 TeV. One of the two scattered protons is measured in the CMS-TOTEM precision proton spectrometer (CT-PPS), which operated for the first time in 2016. The second proton either remains intact or is excited and then dissociates into a low-mass state p*, which is undetected. The measurement is based on an integrated luminosity of 9.4 fb^(\u22121) collected during standard, high-luminosity LHC operation. A total of 12 \u03bc^+\u03bc^\u2212 and 8 e^+e^\u2212 pairs with m(\u2113^+\u2113^\u2212) > 110 GeV, and matching forward proton kinematics, are observed, with expected backgrounds of 1.49 \u00b1 0.07 (stat) \u00b1 0.53 (syst) and 2.36 \u00b1 0.09 (stat) \u00b1 0.47 (syst), respectively. This corresponds to an excess of more than five standard deviations over the expected background. The present result constitutes the first observation of proton-tagged \u03b3\u03b3 collisions at the electroweak scale. This measurement also demonstrates that CT-PPS performs according to the design specifications.", "doi": "10.1007/JHEP07(2018)153", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-07", "series_number": "7", "volume": "2018", "issue": "7", "pages": "Art. No. 153" }, { "id": "authors:5a9fa-wwx46", "collection": "authors", "collection_id": "5a9fa-wwx46", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180809-091716764", "type": "article", "title": "Electroweak production of two jets in association with a Z boson in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the electroweak (EW) production of two jets in association with a Z boson in proton-proton collisions at \u221as = 13TeV is presented, based on data recorded in 2016 by the CMS experiment at the LHC corresponding to an integrated luminosity of 35.9fb^(-1). The measurement is performed in the \u2113\u2113jj final state with \u2113 including electrons and muons, and the jets j corresponding to the quarks produced in the hard interaction. The measured cross section in a kinematic region defined by invariant masses m_(\u2113\u2113) > 50GeV, m_(jj) > 120GeV, and transverse momenta p_(Tj) > 25GeV is \u03c3_(EW)(\u2113\u2113jj) = 534\u00b120(stat)\u00b157(syst) fb, in agreement with leading-order standard model predictions. The final state is also used to perform a search for anomalous trilinear gauge couplings. No evidence is found and limits on anomalous trilinear gauge couplings associated with dimension-six operators are given in the framework of an effective field theory. The corresponding 95% confidence level intervals are \u22122.6", "doi": "10.1140/epjc/s10052-018-6049-9", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2018-07", "series_number": "7", "volume": "78", "issue": "7", "pages": "Art. No. 589" }, { "id": "authors:fjxgn-a7449", "collection": "authors", "collection_id": "fjxgn-a7449", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180802-094947173", "type": "article", "title": "Search for a heavy resonance decaying into a Z boson and a vector boson in the \u03bd\u03bdqq final state", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for a heavy resonance decaying into either a pair of Z bosons or a Z boson and a W boson (ZZ or WZ), with a Z boson decaying into a pair of neutrinos and the other boson decaying hadronically into two collimated quarks that are reconstructed as a highly energetic large-cone jet. The search is performed using the data collected with the CMS detector at the CERN LHC during 2016 in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to a total integrated luminosity of 35.9 fb^(\u22121). No excess is observed in data with regard to background expectations. Results are interpreted in scenarios of physics beyond the standard model. Limits at 95% confidence level on production cross sections are set at 0.9 fb (63 fb) for spin-1 W\u2032 bosons, included in the heavy vector triplet model, with mass 4.0 TeV (1.0 TeV), and at 0.5 fb (40 fb) for spin-2 bulk gravitons with mass 4.0 TeV (1.0 TeV). Lower limits are set on the masses of W\u2032 bosons in the context of two versions of the heavy vector triplet model of 3.1TeV and 3.4 TeV, respectively.", "doi": "10.1007/JHEP07(2018)075", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-07", "series_number": "7", "volume": "2018", "issue": "7", "pages": "Art. No. 75" }, { "id": "authors:aq2e9-drm38", "collection": "authors", "collection_id": "aq2e9-drm38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180628-075746332", "type": "article", "title": "Search for Physics Beyond the Standard Model in Events with High-Momentum Higgs Bosons and Missing Transverse Momentum in Proton-Proton Collisions at 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for physics beyond the standard model in events with one or more high-momentum Higgs bosons, H, decaying to pairs of b quarks in association with missing transverse momentum is presented. The data, corresponding to an integrated luminosity of 35.9\u2009\u2009fb^(-1), were collected with the CMS detector at the LHC in proton-proton collisions at the center-of-mass energy \u221as = 13\u2009\u2009TeV. The analysis utilizes a new b quark tagging technique based on jet substructure to identify jets from H \u2192 bb. Events are categorized by the multiplicity of H-tagged jets, jet mass, and the missing transverse momentum. No significant deviation from standard model expectations is observed. In the context of supersymmetry (SUSY), limits on the cross sections of pair-produced gluinos are set, assuming that gluinos decay to quark pairs, H (or Z), and the lightest SUSY particle, LSP, through an intermediate next-to-lightest SUSY particle, NLSP. With large mass splitting between the NLSP and LSP, and 100% NLSP branching fraction to H, the lower limit on the gluino mass is found to be 2010 GeV.", "doi": "10.1103/PhysRevLett.120.241801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2018-06-15", "series_number": "24", "volume": "120", "issue": "24", "pages": "Art. No. 241801" }, { "id": "authors:t8yfp-51a35", "collection": "authors", "collection_id": "t8yfp-51a35", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180614-075433060", "type": "article", "title": "Search for Heavy Neutral Leptons in Events with Three Charged Leptons in Proton-Proton Collisions at \u221as = 13\u2009\u2009TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a heavy neutral lepton N of Majorana nature decaying into a W boson and a charged lepton is performed using the CMS detector at the LHC. The targeted signature consists of three prompt charged leptons in any flavor combination of electrons and muons. The data were collected in proton-proton collisions at a center-of-mass energy of 13 TeV, with an integrated luminosity of 35.9\u2009\u2009fb^(\u22121). The search is performed in the N mass range between 1 GeV and 1.2 TeV. The data are found to be consistent with the expected standard model background. Upper limits are set on the values of |V_(eN)|^2and |V_(\u03bcN)|^2, where V_(\u2113N) is the matrix element describing the mixing of N with the standard model neutrino of flavor \u2113. These are the first direct limits for N masses above 500 GeV and the first limits obtained at a hadron collider for N masses below 40 GeV.", "doi": "10.1103/PhysRevLett.120.221801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2018-06-01", "series_number": "22", "volume": "120", "issue": "22", "pages": "Art. No. 221801" }, { "id": "authors:0d1ws-s2368", "collection": "authors", "collection_id": "0d1ws-s2368", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180706-125857247", "type": "article", "title": "Measurement of differential cross sections for the production of top quark pairs and of additional jets in lepton + jets events from pp collisions at \u221as = 13\u2009\u2009TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Differential and double-differential cross sections for the production of top quark pairs in proton-proton collisions at \u221as = 13\u2009\u2009TeV are measured as a function of kinematic variables of the top quarks and the top quark-antiquark (tt) system. In addition, kinematic variables and multiplicities of jets associated with the tt production are measured. This analysis is based on data collected by the CMS experiment at the LHC in 2016 corresponding to an integrated luminosity of 35.8\u2009\u2009fb^(-1). The measurements are performed in the lepton+jets decay channels with a single muon or electron and jets in the final state. The differential cross sections are presented at the particle level, within a phase space close to the experimental acceptance, and at the parton level in the full phase space. The results are compared to several standard model predictions that use different methods and approximations. The kinematic variables of the top quarks and the tt system are reasonably described in general, though none predict all the measured distributions. In particular, the transverse momentum distribution of the top quarks is more steeply falling than predicted. The kinematic distributions and multiplicities of jets are adequately modeled by certain combinations of next-to-leading-order calculations and parton shower models.", "doi": "10.1103/PhysRevD.97.112003", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2018-06-01", "series_number": "11", "volume": "97", "issue": "11", "pages": "Art. No. 112003" }, { "id": "authors:k4cdm-67y95", "collection": "authors", "collection_id": "k4cdm-67y95", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180719-075548059", "type": "article", "title": "Search for a new scalar resonance decaying to a pair of Z bosons in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a new scalar resonance decaying to a pair of Z bosons is performed in the mass range from 130 GeV to 3 TeV, and for various width scenarios. The analysis is based on proton-proton collisions recorded by the CMS experiment at the LHC in 2016, corresponding to an integrated luminosity of 35.9 fb^(\u22121) at a center-of-mass energy of 13 TeV. The Z boson pair decays are reconstructed using the 4\u2113, 2\u21132q, and 2\u21132\u03bd final states, where \u2113 = e or \u03bc. Both gluon fusion and electroweak production of the scalar resonance are considered, with a free parameter describing their relative cross sections. A dedicated categorization of events, based on the kinematic properties of associated jets, and matrix element techniques are employed for an optimal signal and background separation. A description of the interference between signal and background amplitudes for a resonance of an arbitrary width is included. No significant excess of events with respect to the standard model expectation is observed and limits are set on the product of the cross section for a new scalar boson and the branching fraction for its decay to ZZ for a large range of masses and widths.", "doi": "10.1007/JHEP06(2018)127", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-06", "series_number": "6", "volume": "2018", "issue": "6", "pages": "Art. No. 127" }, { "id": "authors:m46fh-dby25", "collection": "authors", "collection_id": "m46fh-dby25", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180716-110259346", "type": "article", "title": "Search for ttH production in the all-jet final state in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for the associated production of a Higgs boson with a top quark pair in the all-jet final state. Events containing seven or more jets are selected from a sample of proton-proton collisions at \u221as = 13 TeV collected with the CMS detector at the LHC in 2016, corresponding to an integrated luminosity of 35.9 fb^(\u22121). To separate the ttH signal from the irreducible tt + bb background, the analysis assigns leading order matrix element signal and background probability densities to each event. A likelihood-ratio statistic based on these probability densities is used to extract the signal. The results are provided in terms of an observed ttH signal strength relative to the standard model production cross section \u03bc = \u03c3/\u03c3_(SM), assuming a Higgs boson mass of 125 GeV. The best fit value is \u03bc = 0.9 \u00b1 0.7(stat) \u00b1 1.3(syst) = 0.9 \u00b1 1.5(tot) and the observed and expected upper limits are, respectively, \u03bc < 3.8 and < 3.1 at 95% confidence levels.", "doi": "10.1007/JHEP06(2018)101", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-06", "series_number": "6", "volume": "2018", "issue": "6", "pages": "Art. No. 101" }, { "id": "authors:scwbr-14746", "collection": "authors", "collection_id": "scwbr-14746", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180628-110611589", "type": "article", "title": "Search for single production of vector-like quarks decaying to a b quark and a Higgs boson", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Dutta", "given_name": "I.", "clpid": "Dutta-I" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for single production of heavy vector-like quarks (B) that decay to a Higgs boson and a b quark, with the Higgs boson decaying to a highly boosted bb pair reconstructed as a single collimated jet. The analysis is based on data collected by the CMS experiment in proton-proton collisions at \u221as = 13 TeV, corresponding to an integrated luminosity of 35.9 fb^(\u22121). The data are consistent with background expectations, and upper limits at 95% confidence level on the product of the B quark cross section and the branching fraction are obtained in the range 1.28\u20130.07 pb, for a narrow B quark with a mass between 700 and 1800 GeV. The production of B quarks with widths of 10, 20 and 30% of the resonance mass is also considered, and the sensitivities obtained are similar to those achieved in the narrow width case. This is the first search at the CERN LHC for the single production of a B quark through its fully hadronic decay channel, and the first study considering finite resonance widths of the B quark.", "doi": "10.1007/JHEP06(2018)031", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-06", "series_number": "6", "volume": "2018", "issue": "6", "pages": "Art. No. 31" }, { "id": "authors:6gzed-00h73", "collection": "authors", "collection_id": "6gzed-00h73", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180719-122559236", "type": "article", "title": "Search for high-mass resonances in dilepton final states in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for new high-mass resonances decaying into electron or muon pairs. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2016, corresponding to an integrated luminosity of 36 fb^(\u22121). Observations are in agreement with standard model expectations. Upper limits on the product of a new resonance production cross section and branching fraction to dileptons are calculated in a model-independent manner. This permits the interpretation of the limits in models predicting a narrow dielectron or dimuon resonance. A scan of different intrinsic width hypotheses is performed. Limits are set on the masses of various hypothetical particles. For the Z\u2032_(SSM)(Z\u2032\u03c8)ZSSM\u2032(Z\u03c8\u2032) particle, which arises in the sequential standard model (superstring-inspired model), a lower mass limit of 4.50 (3.90) TeV is set at 95% confidence level. The lightest Kaluza-Klein graviton arising in the Randall-Sundrum model of extra dimensions, with coupling parameters k/M_(Pl) of 0.01, 0.05, and 0.10, is excluded at 95% confidence level below 2.10, 3.65, and 4.25 TeV, respectively. In a simplified model of dark matter production via a vector or axial vector mediator, limits at 95% confidence level are obtained on the masses of the dark matter particle and its mediator.", "doi": "10.1007/JHEP06(2018)120", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-06", "series_number": "6", "volume": "2018", "issue": "6", "pages": "Art. No. 120" }, { "id": "authors:2jsp8-1px87", "collection": "authors", "collection_id": "2jsp8-1px87", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180718-153017283", "type": "article", "title": "Search for high-mass resonances in final states with a lepton and missing transverse momentum at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new high-mass resonances in proton-proton collisions having final states with an electron or muon and missing transverse momentum is presented. The analysis uses proton-proton collision data collected in 2016 with the CMS detector at the LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb^(\u22121). The transverse mass distribution of the charged lepton-neutrino system is used as the discriminating variable. No significant deviation from the standard model prediction is found. The best limit, from the combination of electron and muon channels, is 5.2 TeV at 95% confidence level for the mass of a W\u2032 boson with the same couplings as those of the standard model W boson. Exclusion limits of 2.9 TeV are set on the inverse radius of the extra dimension in the framework of split universal extra dimensions. In addition, model-independent limits are set on the production cross section and coupling strength of W\u2032 bosons decaying into this final state. An interpretation is also made in the context of an R parity violating supersymmetric model with a slepton as a mediator and flavor violating decay.", "doi": "10.1007/JHEP06(2018)128", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-06", "series_number": "6", "volume": "2018", "issue": "6", "pages": "Art. No. 128" }, { "id": "authors:cda9d-thp08", "collection": "authors", "collection_id": "cda9d-thp08", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180620-154840560", "type": "article", "title": "Measurements of differential cross sections of top quark pair production as a function of kinematic event variables in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of differential tt production cross sections are presented in the single-lepton decay channel, as a function of a number of kinematic event variables. The measurements are performed with proton-proton collision data at \u221as = 13 TeV, collected by the CMS experiment at the LHC during 2016, with an integrated luminosity of 35.9 fb^(\u22121). The data are compared to a variety of state-of-the-art leading-order and next-to-leading-order tt simulations.", "doi": "10.1007/JHEP06(2018)002", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-06", "series_number": "6", "volume": "2018", "issue": "6", "pages": "Art. No. 2" }, { "id": "authors:eghkc-yq949", "collection": "authors", "collection_id": "eghkc-yq949", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180717-073300470", "type": "article", "title": "Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Dutta", "given_name": "I.", "clpid": "Dutta-I" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS muon detector system, muon reconstruction software, and high-level trigger underwent significant changes in 2013\u20132014 in preparation for running at higher LHC collision energy and instantaneous luminosity. The performance of the modified system is studied using proton-proton collision data at center-of-mass energy \u221as = 13 TeV, collected at the LHC in 2015 and 2016. The measured performance parameters, including spatial resolution, efficiency, and timing, are found to meet all design specifications and are well reproduced by simulation. Despite the more challenging running conditions, the modified muon system is found to perform as well as, and in many aspects better than, previously. We dedicate this paper to the memory of Prof. Alberto Benvenuti, whose work was fundamental for the CMS muon detector.", "doi": "10.1088/1748-0221/13/06/P06015", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2018-06", "series_number": "6", "volume": "13", "issue": "6", "pages": "Art. No. P06015" }, { "id": "authors:cpr3k-ze244", "collection": "authors", "collection_id": "cpr3k-ze244", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180730-144328979", "type": "article", "title": "Search for the flavor-changing neutral current interactions of the top quark and the Higgs boson which decays into a pair of b quarks at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Dutta", "given_name": "I.", "clpid": "Dutta-I" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for flavor-changing neutral currents (FCNC) in events with the top quark and the Higgs boson is presented. The Higgs boson decay to a pair of b quarks is considered. The data sample corresponds to an integrated luminosity of 35.9 fb^(\u22121) recorded by the CMS experiment at the LHC in proton-proton collisions at \u221as = 13 TeV. Two channels are considered: single top quark FCNC production in association with the Higgs boson (pp \u2192 tH), and top quark pair production with FCNC decay of the top quark (t \u2192 qH). Final states with one isolated lepton and at least three reconstructed jets, among which at least two are associated with b quarks, are studied. No significant deviation is observed from the predicted background. Observed (expected) upper limits at 95% confidence level are set on the branching fractions of top quark decays, \u212c(t\u2009\u2192 uH)\u2009< 0.47% (0.34%) and \u212c(t \u2192 cH)\u2009< 0.47% (0.44%), assuming a single nonzero FCNC coupling.", "doi": "10.1007/JHEP06(2018)102", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-06", "series_number": "6", "volume": "2018", "issue": "6", "pages": "Art. No. 102" }, { "id": "authors:jc4jq-zdz97", "collection": "authors", "collection_id": "jc4jq-zdz97", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180611-111244517", "type": "article", "title": "Search for Narrow Resonances in the b-Tagged Dijet Mass Spectrum in Proton-Proton Collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for narrow resonances decaying to bottom quark-antiquark pairs is presented, using a data sample of proton-proton collisions at \u221as = 8\u2009\u2009TeV corresponding to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121). The search is extended to masses lower than those reached in typical searches for resonances decaying into jet pairs at the LHC, by taking advantage of triggers that identify jets originating from bottom quarks. No significant excess of events is observed above the background predictions. Limits are set on the product of cross section and branching fraction to bottom quarks for spin 0, 1, and 2 resonances in the mass range of 325\u20131200 GeV. These results improve on the limits for resonances decaying into jet pairs in the 325\u2013500 GeV mass range.", "doi": "10.1103/PhysRevLett.120.201801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2018-05-18", "series_number": "20", "volume": "120", "issue": "20", "pages": "Art. No. 201801" }, { "id": "authors:sp3dz-3ze94", "collection": "authors", "collection_id": "sp3dz-3ze94", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180613-140328064", "type": "article", "title": "Search for new physics in final states with an energetic jet or a hadronically decaying W or Z boson and transverse momentum imbalance at \u221as = 13\u2009\u2009TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics using events containing an imbalance in transverse momentum and one or more energetic jets arising from initial-state radiation or the hadronic decay of W or Z bosons is presented. A data sample of proton-proton collisions at \u221as = 13\u2009\u2009TeV, collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 35.9\u2009\u2009fb^(\u22121), is used. The observed data are found to be in agreement with the expectation from standard model processes. The results are interpreted as limits on the dark matter production cross section in simplified models with vector, axial-vector, scalar, and pseudoscalar mediators. Interpretations in the context of fermion portal and nonthermal dark matter models are also provided. In addition, the results are interpreted in terms of invisible decays of the Higgs boson and set stringent limits on the fundamental Planck scale in the Arkani-Hamed, Dimopoulos, and Dvali model with large extra spatial dimensions.", "doi": "10.1103/PhysRevD.97.092005", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2018-05-01", "series_number": "9", "volume": "97", "issue": "9", "pages": "Art. No. 092005" }, { "id": "authors:cyps8-s5092", "collection": "authors", "collection_id": "cyps8-s5092", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180607-135950599", "type": "article", "title": "Search for natural and split supersymmetry in proton-proton collisions at \u221as = 13 TeV in final states with jets and missing transverse momentum", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for supersymmetry (SUSY) is performed in final states comprising one or more jets and missing transverse momentum using data from proton-proton collisions at a centre-of-mass energy of 13 TeV. The data were recorded with the CMS detector at the CERN LHC in 2016 and correspond to an integrated luminosity of 35.9 fb^(\u22121). The number of signal events is found to agree with the expected background yields from standard model processes. The results are interpreted in the context of simplified models of SUSY that assume the production of gluino or squark pairs and their prompt decay to quarks and the lightest neutralino. The masses of bottom, top, and mass-degenerate light-flavour squarks are probed up to 1050, 1000, and 1325 GeV, respectively. The gluino mass is probed up to 1900, 1650, and 1650 GeV when the gluino decays via virtual states of the aforementioned squarks. The strongest mass bounds on the neutralinos from gluino and squark decays are 1150 and 575 GeV, respectively. The search also provides sensitivity to simplified models inspired by split SUSY that involve the production and decay of long-lived gluinos. Values of the proper decay length c\u03c4_0 from 10^(\u22123) to 10^5 mm are considered, as well as a metastable gluino scenario. Gluino masses up to 1750 and 900 GeV are probed for c\u03c4_0 = 1 mm and for the metastable state, respectively. The sensitivity is moderately dependent on model assumptions for c\u03c4_0 \u2273 1 m. The search provides coverage of the c\u03c40parameter space for models involving long-lived gluinos that is complementary to existing techniques at the LHC.", "doi": "10.1007/JHEP05(2018)025", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-05", "series_number": "5", "volume": "2018", "issue": "5", "pages": "Art. No. 25" }, { "id": "authors:xecwn-z4203", "collection": "authors", "collection_id": "xecwn-z4203", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180608-082740372", "type": "article", "title": "Search for a heavy resonance decaying to a pair of vector bosons in the lepton plus merged jet final state at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a new heavy particle decaying to a pair of vector bosons (WW or WZ) is presented using data from the CMS detector corresponding to an integrated luminosity of 35.9 fb^(\u22121) collected in proton-proton collisions at a centre-of-mass energy of 13 TeV in 2016. One of the bosons is required to be a W boson decaying to e\u03bd or \u03bc\u03bd, while the other boson is required to be reconstructed as a single massive jet with substructure compatible with that of a highly-energetic quark pair from a W or Z boson decay. The search is performed in the resonance mass range between 1.0 and 4.4 TeV. The largest deviation from the background-only hypothesis is observed for a mass near 1.4 TeV and corresponds to a local significance of 2.5 standard deviations. The result is interpreted as an upper bound on the resonance production cross section. Comparing the excluded cross section values and the expectations from theoretical calculations in the bulk graviton and heavy vector triplet models, spin-2 WW resonances with mass smaller than 1.07 TeV and spin-1 WZ resonances lighter than 3.05 TeV, respectively, are excluded at 95% confidence level.", "doi": "10.1007/JHEP05(2018)088", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-05", "series_number": "5", "volume": "2018", "issue": "5", "pages": "Art. No. 88" }, { "id": "authors:k7ypg-qew85", "collection": "authors", "collection_id": "k7ypg-qew85", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180607-073821354", "type": "article", "title": "Jet properties in PbPb and pp collisions at \u221as_(NN) = 5.02 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Modifications of the properties of jets in PbPb collisions, relative to those in pp collisions, are studied at a nucleon-nucleon center-of-mass energy of \u221as_(NN) = 5.02 TeV via correlations of charged particles with the jet axis in relative pseudorapidity (\u0394\u03b7), relative azimuth (\u0394\u03d5), and relative angular distance from the jet axis \u0394r = \u221a(\u0394\u03b7)^2 + (\u0394\u03d5)^2. This analysis uses data collected with the CMS detector at the LHC, corresponding to integrated luminosities of 404 \u03bcb^(\u22121) and 27.4 pb^(\u22121) for PbPb and pp collisions, respectively. Charged particle number densities, jet fragmentation functions, and jet shapes are presented as a function of PbPb collision centrality and charged-particle track transverse momentum, providing a differential description of jet modifications due to interactions with the quark-gluon plasma.", "doi": "10.1007/JHEP05(2018)006", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-05", "series_number": "5", "volume": "2018", "issue": "5", "pages": "Art. No. 6" }, { "id": "authors:k191w-p4m09", "collection": "authors", "collection_id": "k191w-p4m09", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180613-132815062", "type": "article", "title": "Search for a heavy right-handed W boson and a heavy neutrino in events with two same-flavor leptons and two jets at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a heavy right-handed W boson (W_R) decaying to a heavy right-handed neutrino and a charged lepton in events with two same-flavor leptons (e or \u03bc) and two jets, is presented. The analysis is based on proton-proton collision data, collected by the CMS Collaboration at the LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb^(\u22121). No significant excess above the standard model expectation is seen in the invariant mass distribution of the dilepton plus dijet system. Assuming that couplings are identical to those of the standard model, and that only one heavy neutrino flavor N_R contributes significantly to the W_R decay width, the region in the two-dimensional (m_W_R,m_N_R) mass plane excluded at 95% confidence level extends to approximately m_W_R=4.4 TeV and covers a large range of right-handed neutrino masses below the W_R boson mass. This analysis provides the most stringent limits on the W_R mass to date.", "doi": "10.1007/JHEP05(2018)148", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-05", "series_number": "5", "volume": "2018", "issue": "5", "pages": "Art. No. 148" }, { "id": "authors:4fppf-jy770", "collection": "authors", "collection_id": "4fppf-jy770", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190222-065948797", "type": "article", "title": "Search for decays of stopped exotic long-lived particles produced in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for the decays of heavy exotic long-lived particles (LLPs) that are produced in proton-proton collisions at a center-of-mass energy of 13 TeV at the CERN LHC and come to rest in the CMS detector. Their decays would be visible during periods of time well separated from proton-proton collisions. Two decay scenarios of stopped LLPs are explored: a hadronic decay detected in the calorimeter and a decay into muons detected in the muon system. The calorimeter (muon) search covers a period of sensitivity totaling 721 (744) hours in 38.6 (39.0) fb^(\u22121) of data collected by the CMS detector in 2015 and 2016. The results are interpreted in several scenarios that predict LLPs. Production cross section limits are set as a function of the mean proper lifetime and the mass of the LLPs, for lifetimes between 100 ns and 10 days. These are the most stringent limits to date on the mass of hadronically decaying stopped LLPs, and this is the first search at the LHC for stopped LLPs that decay to muons.", "doi": "10.1007/JHEP05(2018)127", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-05", "series_number": "5", "volume": "2018", "issue": "5", "pages": "Art. No. 127" }, { "id": "authors:5794t-5h066", "collection": "authors", "collection_id": "5794t-5h066", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180502-143209591", "type": "article", "title": "Measurement of the associated production of a single top quark and a Z boson in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Dutta", "given_name": "I.", "clpid": "Dutta-I" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the associated production of a single top quark and a Z boson. The study uses data from proton\u2013proton collisions at \u221as = 13 TeV recorded by the CMS experiment, corresponding to an integrated luminosity of 35.9 fb^(\u22121). Using final states with three leptons (electrons or muons), the tZq production cross section is measured to be \u03c3(pp\u2192tZq\u2192Wb\u2113^+\u2113^\u2212q)=123_(\u221231)^(+33)(stat)_(\u221223)^(+29)(syst)fb, where \u2113 stands for electrons, muons, or \u03c4 leptons, with observed and expected significances of 3.7 and 3.1 standard deviations, respectively.", "doi": "10.1016/j.physletb.2018.02.025", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2018-04-10", "volume": "779", "pages": "358-384" }, { "id": "authors:8gmg7-tdq55", "collection": "authors", "collection_id": "8gmg7-tdq55", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180420-075933176", "type": "article", "title": "Suppression of Excited Y States Relative to the Ground State in Pb-Pb Collisions at \u221as_(NN) = 5.02\u2009\u2009TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The relative yields of \u03a5 mesons produced in pp and Pb-Pb collisions at \u221as_(NN) = 5.02\u2009\u2009TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, \u03a5(2S) and \u03a5(3S), to the ground state, \u03a5(1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [\u03a5(nS)/\u03a5(1S)]_(Pb\u2212Pb)/[\u03a5(nS)/\u03a5(1S)]_(pp), are measured to be 0.308\u00b10.055(stat)\u00b10.019(syst) for the \u03a5(2S) and less than 0.26 at 95% confidence level for the \u03a5(3S). No significant \u03a5(3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as \u03a5 transverse momentum and rapidity. No significant dependencies are observed.", "doi": "10.1103/PhysRevLett.120.142301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2018-04-06", "series_number": "14", "volume": "120", "issue": "14", "pages": "Art. No. 142301" }, { "id": "authors:a0nmg-86641", "collection": "authors", "collection_id": "a0nmg-86641", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180504-081557597", "type": "article", "title": "Measurement of the \u039b_b polarization and angular parameters in \u039b_b \u2192 J/\u03c8\u039b decays from pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "An analysis of the bottom baryon decay \u039b_b \u2192 J/\u03c8(\u2192 \u03bc^+\u03bc^\u2212)\u039b(\u2192 p\u03c0^\u2212) is performed to measure the \u039b_b polarization and three angular parameters in data from pp collisions at \u221as = 7 and 8 TeV, collected by the CMS experiment at the Large Hadron Collider. The \u039b_b polarization is measured to be 0.00\u00b10.06(stat)\u00b10.06(syst) and the parity-violating asymmetry parameter is determined to be 0.14\u00b10.14(stat)\u00b10.10(syst). The measurements are compared to various theoretical predictions, including those from perturbative quantum chromodynamics.", "doi": "10.1103/PhysRevD.97.072010", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2018-04-01", "series_number": "7", "volume": "97", "issue": "7", "pages": "Art. No. 072010" }, { "id": "authors:3fb9s-3bc37", "collection": "authors", "collection_id": "3fb9s-3bc37", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180413-081708955", "type": "article", "title": "Search for vectorlike light-flavor quark partners in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for heavy vectorlike quarks (VLQs) that couple only to light quarks in proton-proton collisions at \u221as = 8\u2009\u2009TeV at the LHC. The data were collected by the CMS experiment during 2012 and correspond to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121). Both single and pair production of VLQs are considered. The single-production search is performed for down-type VLQs (electric charge of magnitude 1/3), while the pair-production search is sensitive to up-type (charge of magnitude 2/3) and down-type VLQs. Final states with at least one muon or one electron are considered. No significant excess over standard model expectations is observed, and lower limits on the mass of VLQs are derived. The lower limits range from 400 to 1800 GeV, depending on the single-production cross section and the VLQ branching fractions B to W, Z, and Higgs bosons. When considering pair production alone, VLQs with masses below 845 GeV are excluded for B(W)=1.0, and below 685 GeV for B(W)=0.5, B(Z)=B(H)=0.25. The results are more stringent than those previously obtained for single and pair production of VLQs coupled to light quarks.", "doi": "10.1103/PhysRevD.97.072008", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2018-04-01", "series_number": "7", "volume": "97", "issue": "7", "pages": "Art. No. 072008" }, { "id": "authors:fn5he-0e366", "collection": "authors", "collection_id": "fn5he-0e366", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180530-133443136", "type": "article", "title": "Combination of inclusive and differential tt charge asymmetry measurements using ATLAS and CMS data at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Aaboud", "given_name": "M.", "clpid": "Aaboud-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "ATLAS Collaboration" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper presents combinations of inclusive and differential measurements of the charge asymmetry (A_C) in top quark pair (tt) events with a lepton+jets signature by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. The data correspond to integrated luminosities of about 5 and 20 fb^(\u22121) for each experiment, respectively. The resulting combined LHC measurements of the inclusive charge asymmetry are A_C^(CHC7) \u2009=\u20090.005\u2009\u00b1 0.007 (stat)\u2009\u00b1 0.006(syst) at 7 TeV and A_C^(CHC8) \u2009=\u20090.0055\u2002\u00b1\u20020.0023\u2002(stat)\u2002\u00b1\u20020.0025\u2002(syst) at 8 TeV. These values, as well as the combination of ACmeasurements as a function of the invariant mass of the tt system at 8 TeV, are consistent with the respective standard model predictions.", "doi": "10.1007/JHEP04(2018)033", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-04", "series_number": "4", "volume": "2018", "issue": "4", "pages": "Art. No. 33" }, { "id": "authors:mkkhz-z3q24", "collection": "authors", "collection_id": "mkkhz-z3q24", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180606-131118398", "type": "article", "title": "Search for lepton-flavor violating decays of heavy resonances and quantum black holes to e\u03bc final states in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is reported for heavy resonances decaying into e\u03bc final states in proton-proton collisions recorded by the CMS experiment at the CERN LHC at \u221as = 13 TeV, corresponding to an integrated luminosity of 35.9 fb^(\u22121). The search focuses on resonance masses above 200 GeV. With no evidence found for physics beyond the standard model in the e\u03bc mass spectrum, upper limits are set at 95% confidence level on the product of the cross section and branching fraction for this lepton-flavor violating signal. Based on these results, resonant \u03c4 sneutrino production in R-parity violating supersymmetric models is excluded for masses below 1.7 TeV, for couplings \u03bb_(132)\u2009= \u03bb_(231)\u2009=\u2009\u03bb'_(311) =\u20090.01. Heavy Z' gauge bosons with lepton-flavor violating transitions are excluded for masses up to 4.4 TeV. The e\u03bc mass spectrum is also interpreted in terms of non-resonant contributions from quantum black-hole production in models with one to six extra spatial dimensions, and lower mass limits are found between 3.6 and 5.6 TeV. In all interpretations used in this analysis, the results of this search improve previous limits by about 1 TeV. These limits correspond to the most sensitive values obtained at colliders.", "doi": "10.1007/JHEP04(2018)073", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-04", "series_number": "4", "volume": "2018", "issue": "4", "pages": "Art. No. 73" }, { "id": "authors:8kexx-zbg79", "collection": "authors", "collection_id": "8kexx-zbg79", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180509-135716338", "type": "article", "title": "Search for natural supersymmetry in events with top quark pairs and photons in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for natural gauge-mediated supersymmetry (SUSY) in a scenario in which the top squark is the lightest squark, the next-to-lightest SUSY particle is a bino-like neutralino, and the lightest SUSY particle is the gravitino. The strong production of top squark pairs can produce events with pairs of top quarks and neutralinos, with each bino-like neutralino decaying to a photon and a gravitino. The search is performed using a sample of pp collision data accumulated by the CMS experiment at \u221as = 8 TeV, corresponding to an integrated luminosity of 19.7 fb^(\u22121). The final state consists of a lepton (electron or muon), jets, and one or two photons. The imbalance in transverse momentum in the events is compared with the expected spectrum from standard model processes. No excess event yield is observed beyond the expected background, and the result is interpreted in the context of a general model of gauge-mediated SUSY breaking that leads to exclusion of top squark masses below 650\u2013730 GeV.", "doi": "10.1007/JHEP03(2018)167", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-03", "series_number": "3", "volume": "2018", "issue": "3", "pages": "Art. No. 167" }, { "id": "authors:hb247-8bn92", "collection": "authors", "collection_id": "hb247-8bn92", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180510-084207460", "type": "article", "title": "Comparing transverse momentum balance of b jet pairs in pp and PbPb collisions at \u221as_(NN) = 5.02 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The transverse momentum balance of pairs of back-to-back b quark jets in PbPb and pp collisions recorded with the CMS detector at the LHC is reported. The center-of-mass energy in both collision systems is 5.02 TeV per nucleon pair. Compared to the pp collision baseline, b quark jets have a larger imbalance in the most central PbPb collisions, as expected from the jet quenching effect. The data are also compared to the corresponding measurement with inclusive dijets. In the most central collisions, the imbalance of b quark dijets is comparable to that of inclusive dijets.", "doi": "10.1007/JHEP03(2018)181", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-03", "series_number": "3", "volume": "2018", "issue": "3", "pages": "Art. No. 181" }, { "id": "authors:ays5x-n7054", "collection": "authors", "collection_id": "ays5x-n7054", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180330-135752584", "type": "article", "title": "Search for ZZ resonances in the 2\u21132\u03bd final state in proton-proton collisions at 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for heavy resonances decaying to a pair of Z bosons is performed using data collected with the CMS detector at the LHC. Events are selected by requiring two oppositely charged leptons (electrons or muons), consistent with the decay of a Z boson, and large missing transverse momentum, which is interpreted as arising from the decay of a second Z boson to two neutrinos. The analysis uses data from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb^(\u22121). The hypothesis of a spin-2 bulk graviton (X) decaying to a pair of Z bosons is examined for 600 \u2264 m_X \u2264 2500 GeV and upper limits at 95% confidence level are set on the product of the production cross section and branching fraction of X \u2192 ZZ ranging from 100 to 4 fb. For bulk graviton models characterized by a curvature scale parameter k~=0.5 in the extra dimension, the region m_X < 800 GeV is excluded, providing the most stringent limit reported to date. Variations of the model considering the possibility of a wide resonance produced exclusively via gluon-gluon fusion or qq annihilation are also examined.", "doi": "10.1007/JHEP03(2018)003", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2018-03", "series_number": "3", "volume": "2018", "issue": "3", "pages": "Art. No. 003" }, { "id": "authors:j1d8n-ezp37", "collection": "authors", "collection_id": "j1d8n-ezp37", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180124-085543414", "type": "article", "title": "Structural Health Monitoring of Buildings Using Smartphone Sensors", "author": [ { "family_name": "Kong", "given_name": "Qingkai", "orcid": "0000-0002-7399-0661", "clpid": "Kong-Qingkai" }, { "family_name": "Allen", "given_name": "Richard M.", "orcid": "0000-0003-4293-9772", "clpid": "Allen-R-M" }, { "family_name": "Kohler", "given_name": "Monica D.", "orcid": "0000-0002-4703-190X", "clpid": "Kohler-M-D" }, { "family_name": "Heaton", "given_name": "Thomas H.", "orcid": "0000-0003-3363-2197", "clpid": "Heaton-T-H" }, { "family_name": "Bunn", "given_name": "Julian J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" } ], "abstract": "This article presents the results of a shaker test of the Millikan Library in Pasadena, California, using sensors inside smartphones to demonstrate their potential usage as a way to monitor health states of buildings. This approach to structural health monitoring could allow many more commercial and residential buildings to be monitored because it removes the cost prohibitive nature of traditional seismic arrays and the complexity of deploying the instruments. Recordings from the smartphones during the shaking show high correlation with those from a reference sensor in the building, illustrating that the phones can capture the shaking even when not fully coupled to the floor. The fundamental translational frequencies for the east\u2013west and north\u2013south directions and the torsional frequencies of the building can be extracted from single phone recordings. As we compare the displacement derived from the phone recording by double integration to that from the reference sensor, both phase and amplitude match well. Signal\u2010to\u2010noise ratio is improved further by stacking records from multiple phones. These test results demonstrate the ability to extract the fundamental translational and torsional frequencies, and absolute displacements from upper levels of buildings shaken by small local earthquakes. This work builds on the ongoing MyShake project\u2014a global smartphone seismic network.", "doi": "10.1785/0220170111", "issn": "0895-0695", "publisher": "Seismological Society of America", "publication": "Seismological Research Letters", "publication_date": "2018-03", "series_number": "2A", "volume": "89", "issue": "2A", "pages": "594-602" }, { "id": "authors:3pe0g-dnf38", "collection": "authors", "collection_id": "3pe0g-dnf38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180427-132811728", "type": "article", "title": "Study of dijet events with a large rapidity gap between the two leading jets in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Events with no charged particles produced between the two leading jets are studied in proton-proton collisions at \u221as = 7 TeV. The jets were required to have transverse momentum p^(jet)_T > 40 GeV and pseudorapidity 1.5 < |\u03b7^(jet) | < 4.7, and to have values of \u03b7^(jet) with opposite signs. The data used for this study were collected with the CMS detector during low-luminosity running at the LHC, and correspond to an integrated luminosity of 8pb^(\u22121). Events with no charged particles with p_T > 0.2 GeV in the interval \u22121 < \u03b7 <1 between the jets are observed in excess of calculations that assume no color-singlet exchange. The fraction of events with such a rapidity gap, amounting to 0.5\u20131% of the selected dijet sample, is measured as a function of the p_T of the second-leading jet and of the rapidity separation between the jets. The data are compared to previous measurements at the Tevatron, and to perturbative quantum chromodynamics calculations based on the Balitsky\u2013Fadin\u2013Kuraev\u2013Lipatov evolution equations, including different models of the non-perturbative gap survival probability.", "doi": "10.1140/epjc/s10052-018-5691-6", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2018-03", "series_number": "3", "volume": "78", "issue": "3", "pages": "Art. No. 242" }, { "id": "authors:203hr-svq87", "collection": "authors", "collection_id": "203hr-svq87", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180308-151616875", "type": "article", "title": "Search for standard model production of four top quarks with same-sign and multilepton final states in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Nguyen", "given_name": "T. Q.", "orcid": "0000-0003-3954-5131", "clpid": "Nguyen-Thong-Q" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhang", "given_name": "Z.", "orcid": "0000-0002-1630-0986", "clpid": "Zhang-Zhicai" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for standard model production of four top quarks (tttt) is reported using events containing at least three leptons (e,\u03bc) or a same-sign lepton pair. The events are produced in proton\u2013proton collisions at a center-of-mass energy of 13 TeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9 fb^(\u22121). Jet multiplicity and flavor are used to enhance signal sensitivity, and dedicated control regions are used to constrain the dominant backgrounds. The observed and expected signal significances are, respectively, 1.6 and 1.0 standard deviations, and the tttt cross section is measured to be 16.9^(+13.8)_(\u221211.4) fb, in agreement with next-to-leading-order standard model predictions. These results are also used to constrain the Yukawa coupling between the top quark and the Higgs boson to be less than 2.1 times its expected standard model value at 95% confidence level.", "doi": "10.1140/epjc/s10052-018-5607-5", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2018-02", "series_number": "78", "volume": "2018", "issue": "78", "pages": "Art. No. 140" }, { "id": "authors:nqhyq-ppf96", "collection": "authors", "collection_id": "nqhyq-ppf96", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180207-140915053", "type": "article", "title": "Azimuthal anisotropy of charged particles with transverse momentum up to 100GeV/c in PbPb collisions at \u221asNN = 5.02TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The Fourier coefficients v_2 and v_3 characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at \u221asNN = 5.02TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, 1 \u3008 p_T \u3008 100GeV/c. The analysis focuses on the p_T \u3009 10GeV/c range, where anisotropic azimuthal distributions should reflect the path-length dependence of parton energy loss in the created medium. Results are presented in several bins of PbPb collision centrality, spanning the 60% most central events. The v_2 coefficient is measured with the scalar product and the multiparticle cumulant methods, which have different sensitivities to initial-state fluctuations. The values from both methods remain positive up to p_T ~ 60-80GeV/c, in all examined centrality classes. The v_3 coefficient, only measured with the scalar product method, tends to zero for p_T \u2273 20GeV/c. Comparisons between theoretical calculations and data provide new constraints on the path-length dependence of parton energy loss in heavy ion collisions and highlight the importance of the initial-state fluctuations.", "doi": "10.1016/j.physletb.2017.11.041", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2018-01-10", "volume": "776", "pages": "195-216" }, { "id": "authors:j0ejw-q5y93", "collection": "authors", "collection_id": "j0ejw-q5y93", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171222-102204561", "type": "article", "title": "Measurement of charged pion, kaon, and proton production in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Transverse momentum spectra of charged pions, kaons, and protons are measured in proton-proton collisions at \u221as=13\u2009\u2009TeV with the CMS detector at the LHC. The particles, identified via their energy loss in the silicon tracker, are measured in the transverse momentum range of p_T \u2248 0.1\u20131.7\u2009\u2009GeV/c and rapidities |y| < 1. The pT spectra and integrated yields are compared to previous results at smaller \u221as and to predictions of Monte Carlo event generators. The average p_T increases with particle mass and charged particle multiplicity of the event. Comparisons with previous CMS results at \u221as = 0.9, 2.76, and 7 TeV show that the average p_T and the ratios of hadron yields feature very similar dependences on the particle multiplicity in the event, independently of the center-of-mass energy of the pp collision.", "doi": "10.1103/PhysRevD.96.112003", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2017-12-01", "series_number": "11", "volume": "96", "issue": "11", "pages": "Art. No. 112003" }, { "id": "authors:44z5x-vjg02", "collection": "authors", "collection_id": "44z5x-vjg02", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171220-152914061", "type": "article", "title": "Search for black holes and other new phenomena in high-multiplicity final states in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics in energetic, high-multiplicity final states has been performed using proton\u2013proton collision data collected with the CMS detector at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 2.3fb^(-1). The standard model background, dominated by multijet production, is determined exclusively from control regions in data. No statistically significant excess of events is observed. Model-independent limits on the product of the cross section and the acceptance of a new physics signal in these final states are set and further interpreted in terms of limits on the production of black holes. Semiclassical black holes and string balls with masses as high as 9.5 TeV, and quantum black holes with masses as high as 9.0 TeV are excluded by this search in the context of models with extra dimensions, thus significantly extending limits set at a center-of-mass energy of 8 TeV with the LHC Run 1 data.", "doi": "10.1016/j.physletb.2017.09.053", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-11-10", "volume": "774", "pages": "279-307" }, { "id": "authors:9w8yh-gp426", "collection": "authors", "collection_id": "9w8yh-gp426", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171204-141450125", "type": "article", "title": "Measurements of the associated production of a Z boson and b jets in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the associated production of a Z boson with at least one jet originating from a b quark in proton\u2013proton collisions at \u221as = 8 TeV are presented. Differential cross sections are measured with data collected by the CMS experiment corresponding to an integrated luminosity of 19.8fb^(-1). Z bosons are reconstructed through their decays to electrons and muons. Cross sections are measured as a function of observables characterizing the kinematics of the b jet and the Z boson. Ratios of differential cross sections for the associated production with at least one b jet to the associated production with any jet are also presented. The production of a Z boson with at least two b jets is investigated, and differential cross sections are measured for the dijet system. Results are compared to theoretical predictions, testing two different flavour schemes for the choice of initial-state partons.", "doi": "10.1140/epjc/s10052-017-5140-y", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-11", "volume": "77", "pages": "Art. No. 751" }, { "id": "authors:z4f5n-4pw82", "collection": "authors", "collection_id": "z4f5n-4pw82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171128-150432571", "type": "article", "title": "Measurement of the triple-differential dijet cross section in proton-proton collisions at \u221as = 8 TeV and constraints on parton distribution functions", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the triple-differential dijet cross section at a centre-of-mass energy of 8TeV using 19.7fb^(-1) of data collected with the CMS detector in proton-proton collisions at the LHC. The cross section is measured as a function of the average transverse momentum, half the rapidity separation, and the boost of the two leading jets in the event. The cross section is corrected for detector effects and compared to calculations in perturbative quantum chromodynamics at next-to-leading order accuracy, complemented with electroweak and nonperturbative corrections. New constraints on parton distribution functions are obtained and the inferred value of the strong coupling constant is \u03b1_S(M_Z) = 0.1199 \u00b1 0.0015(exp)^(+0.0031)_(\u22120.0020) (theo), where M_Z is the mass of the Z boson.", "doi": "10.1140/epjc/s10052-017-5286-7", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-11", "volume": "77", "pages": "Art. No. 746" }, { "id": "authors:0rqbp-84565", "collection": "authors", "collection_id": "0rqbp-84565", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171102-092520336", "type": "article", "title": "Search for new physics in the monophoton final state in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is conducted for new physics in a final state containing a photon and missing transverse momentum in proton-proton collisions at \u221as= 13 TeV. The data collected by the CMS experiment at the CERN LHC correspond to an integrated luminosity of 12.9 fb^(\u22121). No deviations are observed relative to the predictions of the standard model. The results are interpreted as exclusion limits on the dark matter production cross sections and parameters in models containing extra spatial dimensions. Improved limits are set with respect to previous searches using the monophoton final state. In particular, the limits on the extra dimension model parameters are the most stringent to date in this channel.", "doi": "10.1007/JHEP10(2017)073", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-10-11", "series_number": "10", "volume": "2017", "issue": "10", "pages": "Art. No. 73" }, { "id": "authors:2t9v8-54n19", "collection": "authors", "collection_id": "2t9v8-54n19", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171113-155534231", "type": "article", "title": "Search for leptophobic Z\u2032 bosons decaying into four-lepton final states in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for heavy narrow resonances decaying into four-lepton final states has been performed using proton\u2013proton collision data at \u221as = 8 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7fb^(\u22121). No excess of events over the standard model background expectation is observed. Upper limits for a benchmark model on the product of cross section and branching fraction for the production of these heavy narrow resonances are presented. The limit excludes leptophobic Z\u2032 bosons with masses below 2.5 TeV within the benchmark model. This is the first result to constrain a leptophobic Z\u2032 resonance in the four-lepton channel.", "doi": "10.1016/j.physletb.2017.08.069", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-10-10", "volume": "773", "pages": "563-584" }, { "id": "authors:fx6x7-28984", "collection": "authors", "collection_id": "fx6x7-28984", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171031-125452831", "type": "article", "title": "Search for Charged Higgs Bosons Produced via Vector Boson Fusion and Decaying into a Pair of W and Z Bosons Using pp Collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for charged Higgs bosons produced via vector boson fusion and decaying into W and Z bosons using proton-proton collisions at \u221as = 13 TeV is presented. The data sample corresponds to an integrated luminosity of 15.2\u2009\u2009fb^(\u22121) collected with the CMS detector in 2015 and 2016. The event selection requires three leptons (electrons or muons), two jets with large pseudorapidity separation and high dijet mass, and missing transverse momentum. The observation agrees with the standard model prediction. Limits on the vector boson fusion production cross section times branching fraction for new charged physical states are reported as a function of mass from 200 to 2000 GeV and interpreted in the context of Higgs triplet models.", "doi": "10.1103/PhysRevLett.119.141802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2017-10-06", "series_number": "14", "volume": "119", "issue": "14", "pages": "Art. No. 141802" }, { "id": "authors:xpfrq-bey53", "collection": "authors", "collection_id": "xpfrq-bey53", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171025-171722509", "type": "article", "title": "Measurement of the semileptonic t t-bar + \u03b3 production cross section in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the cross section for top quark-antiquark (t t-bar) pairs produced in association with a photon in proton-proton collisions at \u221as = 8 TeV is presented. The analysis uses data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.7 fb^1. The signal is defined as the production of a t t-bar pair in association with a photon having a transverse energy larger than 25 GeV and an absolute pseudorapidity smaller than 1.44. The measurement is performed in the fiducial phase space corresponding to the semileptonic decay chain of the t t-bar pair, and the cross section is measured relative to the inclusive t t-bar pair production cross section. The fiducial cross section for associated t t-bar pair and photon production is found to be 127\u00b127 (stat+syst) fb per semileptonic final state. The measured value is in agreement with the theoretical prediction.", "doi": "10.1007/JHEP10(2017)006", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-10-02", "series_number": "10", "volume": "2017", "issue": "10", "pages": "Art No. 6" }, { "id": "authors:7qawj-15p06", "collection": "authors", "collection_id": "7qawj-15p06", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171205-071203399", "type": "article", "title": "Search for Higgs boson pair production in the bb\u03c4\u03c4 final state in proton-proton collisions at \u221a(s) = 8\u2009\u2009TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for production of Higgs boson pairs (HH) where one boson decays to a pair of b quarks and the other to a \u03c4 lepton pair. This work is based on proton-proton collision data collected by the CMS experiment at \u221as = 8\u2009\u2009TeV, corresponding to an integrated luminosity of 18.3\u2009\u2009fb^(\u22121). Resonant and nonresonant modes of HH production have been probed and no significant excess relative to the background-only hypotheses has been found in either mode. Upper limits on cross sections of the two HH production modes have been set. The results have been combined with previously published searches at \u221as = 8\u2009\u2009TeV, in decay modes to two photons and two b quarks, as well as to four b quarks, which also show no evidence for a signal. Limits from the combination have been set on resonant HH production by an unknown particle X in the mass range m_X = 300\u2009\u2009GeV to m_X = 1000\u2009\u2009GeV. For resonant production of spin 0 (spin 2) particles, the observed 95% CL upper limit is 1.13 pb (1.09 pb) at m_X = 300\u2009\u2009GeV and to 21 fb (18 fb) at m_X = 1000\u2009\u2009GeV. For nonresonant HH production, a limit of 43 times the rate predicted by the standard model has been set.", "doi": "10.1103/PhysRevD.96.072004", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2017-10-01", "series_number": "7", "volume": "96", "issue": "7", "pages": "Art. No. 072004" }, { "id": "authors:22ssr-sha03", "collection": "authors", "collection_id": "22ssr-sha03", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171102-100548749", "type": "article", "title": "Measurements of the pp \u2192 W\u03b3\u03b3 and pp \u2192 Z\u03b3\u03b3 cross sections and limits on anomalous quartic gauge couplings at \u221as = 8 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements are presented of W\u03b3\u03b3 and Z\u03b3\u03b3 production in proton-proton collisions. Fiducial cross sections are reported based on a data sample corresponding to an integrated luminosity of 19.4 fb^(\u22121) collected with the CMS detector at a center-of-mass energy of 8 TeV. Signal is identified through the W \u2192 \u2113\u03bd and Z \u2192 \u2113\u2113 decay modes, where \u2113 is a muon or an electron. The production of W\u03b3\u03b3 and Z\u03b3\u03b3, measured with significances of 2.6 and 5.9 standard deviations, respectively, is consistent with standard model predictions. In addition, limits on anomalous quartic gauge couplings in W\u03b3\u03b3 production are determined in the context of a dimension-8 effective field theory.", "doi": "10.1007/JHEP10(2017)072", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-10", "series_number": "10", "volume": "2017", "issue": "10", "pages": "Art. No. 72" }, { "id": "authors:xx9e4-5dg73", "collection": "authors", "collection_id": "xx9e4-5dg73", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171114-085708129", "type": "article", "title": "Search for light bosons in decays of the 125 GeV Higgs boson in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for decays beyond the standard model of the 125 GeV Higgs bosons to a pair of light bosons, based on models with extended scalar sectors. Light boson masses between 5 and 62.5 GeV are probed in final states containing four \u03c4 leptons, two muons and two b quarks, or two muons and two \u03c4 leptons. The results are from data in proton-proton collisions corresponding to an integrated luminosity of 19.7 fb^(\u22121), accumulated by the CMS experiment at the LHC at a center-of-mass energy of 8 TeV. No evidence for such exotic decays is found in the data. Upper limits are set on the product of the cross section and branching fraction for several signal processes. The results are also compared to predictions of two-Higgs-doublet models, including those with an additional scalar singlet.", "doi": "10.1007/JHEP10(2017)076", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-10", "series_number": "10", "volume": "2017", "issue": "10", "pages": "Art. No. 076" }, { "id": "authors:z4xcr-53493", "collection": "authors", "collection_id": "z4xcr-53493", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171129-080521017", "type": "article", "title": "Particle-flow reconstruction and global event description with the CMS detector", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS apparatus was identified, a few years before the start of the LHC operation at CERN, to feature properties well suited to particle-flow (PF) reconstruction: a highly-segmented tracker, a fine-grained electromagnetic calorimeter, a hermetic hadron calorimeter, a strong magnetic field, and an excellent muon spectrometer. A fully-fledged PF reconstruction algorithm tuned to the CMS detector was therefore developed and has been consistently used in physics analyses for the first time at a hadron collider. For each collision, the comprehensive list of final-state particles identified and reconstructed by the algorithm provides a global event description that leads to unprecedented CMS performance for jet and hadronic \u03c4 decay reconstruction, missing transverse momentum determination, and electron and muon identification. This approach also allows particles from pileup interactions to be identified and enables efficient pileup mitigation methods. The data collected by CMS at a centre-of-mass energy of 8\\TeV show excellent agreement with the simulation and confirm the superior PF performance at least up to an average of 20 pileup interactions.", "doi": "10.1088/1748-0221/12/10/P10003", "issn": "1748-0221", "publisher": "IOP Publishing", "publication": "Journal of Instrumentation", "publication_date": "2017-10", "series_number": "10", "volume": "12", "issue": "10", "pages": "Art. No. P10003" }, { "id": "authors:7m65t-5j362", "collection": "authors", "collection_id": "7m65t-5j362", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171204-082842695", "type": "article", "title": "Search for associated production of dark matter with a Higgs boson decaying to bb or \u03b3\u03b3 at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for dark matter is performed looking for events with large missing transverse momentum and a Higgs boson decaying either to a pair of bottom quarks or to a pair of photons. The data from proton-proton collisions at a center-of-mass energy of 13 TeV, collected in 2015 with the CMS detector at the LHC, correspond to an integrated luminosity of 2.3 fb^(\u22121). Results are interpreted in the context of a Z\u2032-two-Higgs-doublet model, where the gauge symmetry of the standard model is extended by a U(1)_Z\u2009\u2032 group, with a new massive Z\u2032 gauge boson, and the Higgs sector is extended with four additional Higgs bosons. In this model, a high-mass resonance Z\u2032 decays into a pseudoscalar boson A and a light SM-like scalar Higgs boson, and the A decays to a pair of dark matter particles. No significant excesses are observed over the background prediction. Combining results from the two decay channels yields exclusion limits in the signal cross section in the m_Z\u2009\u2032 - m_A phase space. For example, the observed data exclude the Z\u2032 mass range from 600 to 1860 GeV, for Z\u2032 coupling strength g_Z\u2009\u2032\u2009=\u20090.8, the coupling of A with dark matter particles g_\u03c7 = 1, the ratio of the vacuum expectation values tan \u03b2 = 1, and m_A = 300 GeV. The results of this analysis are valid for any dark matter particle mass below 100 GeV.", "doi": "10.1007/JHEP10(2017)180", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-10", "series_number": "10", "volume": "2017", "issue": "10", "pages": "Art. No. 180" }, { "id": "authors:sh5gy-4m362", "collection": "authors", "collection_id": "sh5gy-4m362", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171115-083940537", "type": "article", "title": "Measurements of jet charge with dijet events in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Jet charge is an estimator of the electric charge of a quark, antiquark, or gluon initiating a jet. It is based on the momentum-weighted sum of the electric charges of the jet constituents. Measurements of three charge observables of the leading jet in transverse momentum p_T are performed with dijet events. The analysis is carried out with ata collected by the CMS experiment at the CERN LHC in proton-proton collisions at \u221as = 8 TeV corresponding to an integrated luminosity of 19.7fb^(\u22121). The results are presented as a function of the p_T of the leading jet and compared to predictions from leading- and next-to-leading-order event generators combined with parton showers. Measured jet charge distributions, unfolded for detector effects, are reported, which expand on previous measurements of the jet charge average and standard deviation in pp collisions.", "doi": "10.1007/JHEP10(2017)131", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-10", "series_number": "10", "volume": "2017", "issue": "10", "pages": "Art. No. 131" }, { "id": "authors:aga8s-79a22", "collection": "authors", "collection_id": "aga8s-79a22", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171026-160546612", "type": "article", "title": "Search for new phenomena with multiple charged leptons in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported from a search for physics beyond the standard model in final states with at least three charged leptons, in any combination of electrons or muons. The data sample corresponds to an integrated luminosity of 2.3 fb^(\u22121) of proton\u2013proton collisions at \u221as = 13 TeV, recorded by the CMS experiment at the LHC in 2015. Two jets are required in each event, providing good sensitivity to strong production of gluinos and squarks. The search regions, sensitive to a range of different new physics scenarios, are defined using the number of jets tagged as originating from bottom quarks, the sum of the magnitudes of the transverse momenta of the jets, the imbalance in the overall transverse momentum in the event, and the invariant mass of opposite-sign, same-flavor lepton pairs. The event yields observed in data are consistent with the expected background contributions from standard model processes. These results are used to derive limits in terms of R-parity conserving simplified models of supersymmetry that describe strong production of gluinos and squarks. Model-independent limits are presented to facilitate the reinterpretation of the results in a broad range of scenarios for physics beyond the standard model.", "doi": "10.1140/epjc/s10052-017-5182-1", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-09-22", "series_number": "9", "volume": "77", "issue": "9", "pages": "Art. No. 635" }, { "id": "authors:qr922-jej16", "collection": "authors", "collection_id": "qr922-jej16", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171012-115619479", "type": "article", "title": "Search for a heavy resonance decaying to a top quark and a vector-like top quark at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for massive spin-1 Z\u2032 resonances decaying to a top quark and a heavy vector-like top quark partner T. The search is based on a 2.6 fb^(\u22121) sample of proton-proton collisions at 13 TeV collected with the CMS detector at the LHC. The analysis is optimized for final states in which the T quark decays to a W boson and a bottom quark. The focus is on all-jet final states in which both the W boson and the top quark decay into quarks that evolve into jets. The decay products of the top quark and of the W boson are assumed to be highly Lorentz-boosted and cannot be reconstructed as separate jets, but are instead reconstructed as merged, wide jets. Techniques for the identification of jet substructure and jet flavour are used to distinguish signal from background events. Several models for Z\u2032 bosons decaying to T quarks are excluded at 95% confidence level, with upper limits on the cross section ranging from 0.13 to 10 pb, depending on the chosen hypotheses. This is the first search for a neutral spin-1 heavy resonance decaying to a top quark and a vector-like T quark in the all-hadronic final state.", "doi": "10.1007/JHEP09(2017)053", "issn": "1029-8479", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-09-13", "series_number": "09", "volume": "2017", "issue": "09", "pages": "Art. No. 053" }, { "id": "authors:w4fc0-nnh75", "collection": "authors", "collection_id": "w4fc0-nnh75", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171012-111121817", "type": "article", "title": "Measurement of the tt production cross section using events with one lepton and at least one jet in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the tt production cross section at \u221as = 13 TeV is presented using proton-proton collisions, corresponding to an integrated luminosity of 2.2 fb^(\u22121), collected with the CMS detector at the LHC. Final states with one isolated charged lepton (electron or muon) and at least one jet are selected and categorized according to the accompanying jet multiplicity. From a likelihood fit to the invariant mass distribution of the isolated lepton and a jet identified as coming from the hadronization of a bottom quark, the cross section is measured to be \u03c3_(tt) = 888 \u00b1 2,(stat)^(+26)_(\u221228)(syst)\u00b120(lumi)pb, in agreement with the standard model prediction. Using the expected dependence of the cross section on the pole mass of the top quark (m_t), the value of m_t is found to be 170.6 \u00b1 2.7 GeV.", "doi": "10.1007/JHEP09(2017)051", "issn": "1029-8479", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-09-13", "series_number": "09", "volume": "2017", "issue": "09", "pages": "Art. No. 051" }, { "id": "authors:w1wma-e7r05", "collection": "authors", "collection_id": "w1wma-e7r05", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171106-081424289", "type": "article", "title": "Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at \u221aS_(NN) = 5.02 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in proton\u2013lead (pPb) collisions at a nucleon\u2013nucleon center-of-mass energy of \u221as_(NN) = 5.02 TeV, as well as results from charm quark jets in proton\u2013proton (pp) collisions at \u221as =2 .76 and 5.02 TeV. By comparing the yields of the pPb and pp collision systems at the same energy, a nuclear modification factor for charm jets from 55 to 400 GeV/c in pPb collisions at \u221as_(NN) = 5.02 TeV of R _(pA) = 0.92 \u00b1 0.07(stat) \u00b1 0.11(syst) is obtained. This is consistent with an absence of final-state energy loss for charm quarks in pPb collisions. In addition, the fraction of jets coming from charm quarks is found to be consistent with that predicted by PYTHIA 6 for pp collisions at \u221as = 2.76 and 5.02 TeV, and is independent of the jet transverse momentum from 55 to 400 GeV/c.", "doi": "10.1016/j.physletb.2017.06.053", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-09-10", "volume": "772", "pages": "306-329" }, { "id": "authors:xcb0y-43r60", "collection": "authors", "collection_id": "xcb0y-43r60", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171006-112430527", "type": "article", "title": "Study of Jet Quenching with Z + jet Correlations in Pb-Pb and pp Collisions at \u221asNN =5.02 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of jets in association with Z bosons, reconstructed via the \u03bc^+\u03bc^\u2212 and e^+e^\u2212 decay channels, is studied in pp and, for the first time, in Pb-Pb collisions. Both data samples were collected by the CMS experiment at the LHC, at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The Pb-Pb collisions were analyzed in the 0%\u201330% centrality range. The back-to-back azimuthal alignment was studied in both pp and Pb-Pb collisions for Z bosons with transverse momentum p^Z_T > 60\u2009GeV/cand a recoiling jet with p^(jet)_T > 30\u2009GeV/c. The p_T imbalance x_jZ = p^(jet)_T/p^Z_T, as well as he average number of jet partners per Z, R_jZ, was studied in intervals of p^Z_T. The R_jZ is found to be smaller in Pb-Pb than in pp collisions, which suggests that in Pb-Pb collisions a larger fraction of partons associated with the Z bosons fall below the 30\u2009GeV/c p^(jet)_T threshold because hey lose energy.", "doi": "10.1103/PhysRevLett.119.082301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2017-08-25", "series_number": "8", "volume": "119", "issue": "8", "pages": "Art. No. 082301" }, { "id": "authors:nxdfc-ab647", "collection": "authors", "collection_id": "nxdfc-ab647", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171003-125040034", "type": "article", "title": "Measurement of the differential inclusive B^+ hadron cross sections in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The differential cross sections for inclusive production of B^+ hadrons are measured as a function of the B+ transverse momentum p_T^B and rapidity y^B in pp collisions at a centre-of-mass energy of 13\u2009TeV, using data collected by the CMS experiment that correspond to an integrated luminosity of 48.1\u2009pb^(\u22121). The measurement uses the exclusive decay channel B+\u2192J/\u03c8K^+, with J/\u03c8 mesons that decay to a pair of muons. The results show a reasonable agreement with theoretical calculations within the uncertainties.", "doi": "10.1016/j.physletb.2017.05.074", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-08-10", "volume": "771", "pages": "435-456" }, { "id": "authors:0maxx-8st07", "collection": "authors", "collection_id": "0maxx-8st07", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-111242723", "type": "article", "title": "Search for single production of a heavy vector-like T quark decaying to a Higgs boson and a top quark with a lepton and jets in the final state", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for single production of vector-like top quark partners (T) decaying into a Higgs boson and a top quark is performed using data from pp collisions at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 2.3 fb^(\u22121). The top quark decay includes an electron or a muon while the Higgs boson decays into a pair of b quarks. No significant excess over standard model backgrounds is observed. Exclusion limits on the product of the production cross section and the branching fraction are derived in the T quark mass range 700 to 1800 GeV. For a mass of 1000 GeV, values of the product of the production cross section and the branching fraction greater than 0.8 and 0.7 pb are excluded at 95% confidence level, assuming left- and right-handed coupling of the T quark to standard model particles, respectively. This is the first analysis setting exclusion limits on the cross section of singly produced vector-like T quarks at a centre-of-mass energy of 13 TeV.", "doi": "10.1016/j.physletb.2017.05.019", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-08-10", "volume": "771", "pages": "80-105" }, { "id": "authors:rbvfx-08782", "collection": "authors", "collection_id": "rbvfx-08782", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171005-063746716", "type": "article", "title": "Measurement of the top quark mass in the dileptonic tt decay channel using the mass observables M_(b\u2113), M_(T2), and M_(b\u2113\u03bd) in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the top quark mass (M_t) in the dileptonic \ntt decay channel is performed using data from proton-proton collisions at a center-of-mass energy of 8 TeV. The data was recorded by the CMS experiment at the LHC and corresponds to an integrated luminosity of 19.7 \u00b1 0.5 \u2009\nfb^(\u22121). Events are selected with two oppositely charged leptons (\u2113=e, \u03bc) and two jets identified as originating from b quarks. The analysis is based on three kinematic observables whose distributions are sensitive to the value of M_t. An invariant mass observable, M_(b\u2113), and a \"stransverse mass\" observable, M_(T2), are employed in a Simultaneous fit to determine the value of M_t and an overall jet energy scale factor (JSF). A complementary approach is used to construct an invariant mass observable, M_(b\u2113\u03bd), that is combined with M_(T2) to measure M_t. The shapes of the observables, along with their evolutions in Mt and JSF, are modeled by a nonparametric Gaussian process regression technique. The sensitivity of the observables to the value of M_t is investigated using a Fisher information density method. The top quark mass is measured to be \n172.22\u00b10.18(stat)^(+0.89)_(\u22120.93)(syst)GeV.", "doi": "10.1103/PhysRevD.96.032002", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2017-08-01", "series_number": "3", "volume": "96", "issue": "3", "pages": "Art. No. 032002" }, { "id": "authors:0fmyw-h4k02", "collection": "authors", "collection_id": "0fmyw-h4k02", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171020-143004868", "type": "article", "title": "Measurement of the inclusive energy spectrum in the very forward direction in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The differential cross section for inclusive particle production as a function of energy in proton-proton collisions at a center-of-mass energy of 13 TeV is measured in the very forward region of the CMS detector. The measurement is based on data collected with the CMS apparatus at the LHC, and corresponds to an integrated luminosity of 0.34 \u03bcb^(\u22121). The energy is measured in the CASTOR calorimeter, which covers the pseudorapidity region \u22126.6 < \u03b7 < \u22125.2. The results are given as a function of the total energy deposited in CASTOR, as well as of its electromagnetic and hadronic components. The spectra are sensitive to the modeling of multiparton interactions in pp collisions, and provide new constraints for hadronic interaction models used in collider and in high energy cosmic ray physics.", "doi": "10.1007/JHEP08(2017)046", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-08", "series_number": "8", "volume": "2017", "issue": "8", "pages": "Art No. 46" }, { "id": "authors:vjtrd-mhq27", "collection": "authors", "collection_id": "vjtrd-mhq27", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171019-105741113", "type": "article", "title": "Pseudorapidity dependence of long-range two-particle correlations in pPb collisions at \u221as_NN = 5.02 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Two-particle correlations in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are studied as a function of the pseudorapidity separation (\u25b3\u03b7) of the particle pair at small relative azimuthal angle (|\u25b3\u03d5| < \u03c0/3). The correlations are decomposed into a jet component that dominates the short-range correlations (|\u25b3\u03b7| < 1), and a component that persists at large \u25b3\u03b7 and may originate from collective behavior of the produced system. The events are classified in terms of the multiplicity of the produced particles. Finite azimuthal anisotropies are observed in high-multiplicity events. The second and third Fourier components of the particle-pair azimuthal correlations, V_2 and V_3, are extracted after subtraction of the jet component. The single-particle anisotropy parameters v_2 and v_3 are normalized by their laboratory frame midrapidity value and are studied as a function of \u03b7_c.m.. The normalized v_2 distribution is found to be asymmetric about \u03b7_c.m. = 0, with smaller values observed at forward pseudorapidity, corresponding to the direction of the proton beam, while no significant pseudorapidity dependence is observed for the normalized v_3 distribution within the statistical uncertainties.", "doi": "10.1103/PhysRevC.96.014915", "issn": "0556-2813", "publisher": "American Physical Society", "publication": "Physical Review C", "publication_date": "2017-07-31", "series_number": "1", "volume": "96", "issue": "1", "pages": "Art No. 014915" }, { "id": "authors:p6y7a-2zd07", "collection": "authors", "collection_id": "p6y7a-2zd07", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171102-105911665", "type": "article", "title": "Cross section measurement of t-channel single top quark production in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The cross section for the production of single top quarks in the t channel is measured in proton-proton collisions at 13 TeV with the CMS detector at the LHC. The analyzed data correspond to an integrated luminosity of 2.2 fb^(\u22121). The event selection requires one muon and two jets where one of the jets is identified as originating from a bottom quark. Several kinematic variables are then combined into a multivariate discriminator to distinguish signal from background events. A fit to the distribution of the discriminating variable yields a total cross section of 238 \u00b1 13 (stat) \u00b1 29 (syst) pb and a ratio of top quark and top antiquark production of R_(t-ch.) = 1.81 \u00b1 0.18 (stat) \u00b1 0.15 (syst). From the total cross section the absolute value of the CKM matrix element V_(tb) is calculated to be 1.05 \u00b1 0.07 (exp) \u00b1 0.02 (theo). All results are in agreement with the standard model predictions.", "doi": "10.1016/j.physletb.2017.07.047", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-07-29", "volume": "772", "pages": "752-776" }, { "id": "authors:kq37h-bzj72", "collection": "authors", "collection_id": "kq37h-bzj72", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171018-163402352", "type": "article", "title": "Search for third-generation scalar leptoquarks and heavy right-handed neutrinos in final states with two tau leptons and two jets in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for third-generation scalar leptoquarks and heavy right-handed neutrinos in events containing one electron or muon, one hadronically decaying \u03c4 lepton, and at least two jets, using a \u221as = 13 TeV pp collision data sample corresponding to an integrated luminosity of 12.9 fb^(-1) collected with the CMS detector at the LHC in 2016. The number of observed events is found to be in agreement with the standard model prediction. A limit is set at 95% confidence level on the product of the leptoquark pair production cross section and \u03b2^2, where \u03b2 is the branching fraction of leptoquark decay to a \u03c4 lepton and a bottom quark. Assuming \u03b2 = 1, third-generation leptoquarks with masses below 850 GeV are excluded at 95% confidence level. An additional search based on the same event topology involves heavy right-handed neutrinos, N_R, and right-handed W bosons, W_R, arising in a left-right symmetric extension of the standard model. In this search, W_R bosons are assumed to decay to a tau lepton and N_R followed by the decay of the N_R to a tau lepton and an off-shell W_R boson. Assuming the mass of the right-handed neutrino to be half of the mass of the right-handed W boson, W_R boson masses below 2.9 TeV are excluded at 95% confidence level. These results improve on the limits from previous searches for third-generation leptoquarks and heavy right-handed neutrinos with \u03c4 leptons in the final state.", "doi": "10.1007/JHEP07(2017)121", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-07-26", "series_number": "7", "volume": "2017", "issue": "7", "pages": "Art No. 121" }, { "id": "authors:v18a8-xdk37", "collection": "authors", "collection_id": "v18a8-xdk37", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171103-083610054", "type": "article", "title": "Search for single production of vector-like quarks decaying into a b quark and a W boson in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for a heavy vector-like quark, decaying into a b quark and a W boson, which is produced singly in association with a light flavor quark and a b quark. The analysis is performed using a data sample of proton\u2013proton collisions at a center-of-mass energy of \u221as = 13 TeV collected at the LHC in 2015. The data set used in the analysis corresponds to an integrated luminosity of 2.3 fb^(\u22121). The search is carried out using events containing one electron or muon, at least one b-tagged jet with large transverse momentum, at least one jet in the forward region of the detector, and missing transverse momentum. No excess over the standard model prediction is observed. Upper limits are placed on the production cross section of heavy exotic quarks: a T quark with a charge of 2/3, and a Y quark with a charge of \u22124/3. For Y quarks with coupling of 0.5 and \u212c(Y \u2192bW) =100%, the observed (expected) lower mass limits are 1.40 (1.0)TeV. This is the most stringent limit to date on the single production of the Y vector-like quark.", "doi": "10.1016/j.physletb.2017.07.022", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-07-15", "volume": "772", "pages": "634-656" }, { "id": "authors:hx8fd-bf963", "collection": "authors", "collection_id": "hx8fd-bf963", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171017-112515004", "type": "article", "title": "Measurement of double-differential cross sections for top quark pair production in pp collisions at \u221as = 8 TeV and impact on parton distribution functions", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Normalized double-differential cross sections for top quark pair (t t-bar) production are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7 fb^(\u22121). The measurement is performed in the dilepton e^\u00b1 \u03bc^\u2213 final state. The t t-bar cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and tt system. The data are compared to calculations using perturbative quantum chromodynamics at next-to-leading and approximate next-to-next-to-leading orders. They are also compared to predictions of Monte Carlo event generators that complement fixed-order computations with parton showers, hadronization, and multiple-parton interactions. Overall agreement is observed with the predictions, which is improved when the latest global sets of proton parton distribution functions are used. The inclusion of the measured t t-bar cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.", "doi": "10.1140/epjc/s10052-017-4984-5", "pmcid": "PMC5587255", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-07-11", "series_number": "7", "volume": "77", "issue": "7", "pages": "Art. No. 459" }, { "id": "authors:cach2-2d037", "collection": "authors", "collection_id": "cach2-2d037", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171003-124618464", "type": "article", "title": "Suppression of \u03d2(1S), \u03d2(2S), and \u03d2(3S) quarkonium states in PbPb collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The production yields of \u03d2(1S), \u03d2(2S), and \u03d2(3S) quarkonium states are measured through their decays into muon pairs in the CMS detector, in PbPb and pp collisions at the centre-of-mass energy per nucleon pair of 2.76\u2009TeV. The data correspond to integrated luminosities of 166 \u03bcb^(\u22121) and 5.4 pb^(\u22121) for PbPb and pp collisions, respectively. Differential production cross sections are reported as functions of \u03d2 rapidity y up to 2.4, and transverse momentum p_T up to 20 Ge V/c. A strong centrality-dependent suppression is observed in PbPb relative to pp collisions, by factors of up to \u22482 and 8, for the \u03d2(1S) and \u03d2(2S) states, respectively. No significant dependence of this suppression is observed as a function of y or p_T. The \u03d2(3S) state is not observed in PbPb collisions, which corresponds to a suppression for the centrality-integrated data by at least a factor of \u22487 at a 95% confidence level. The observed suppression is in agreement with theoretical scenarios modeling the sequential melting of quarkonium states in a quark gluon plasma.", "doi": "10.1016/j.physletb.2017.04.031", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-07-10", "volume": "770", "pages": "357-379" }, { "id": "authors:ptkzy-bbh29", "collection": "authors", "collection_id": "ptkzy-bbh29", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-082534414", "type": "article", "title": "Measurement of the cross section for electroweak production of Z\u03b3in association with two jets and constraints on anomalous quartic gauge couplings in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the cross section for the electroweak production of a Z boson and a photon in association with two jets in proton\u2013proton collisions at \u221as = 8 TeV. The Z bosons are identified through their decays to electron or muon pairs. The measurement is based on data collected with the CMS detector corresponding to an integrated luminosity of 19.7 fb^(\u22121). The electroweak contribution has a significance of 3.0 standard deviations, and the measured fiducial cross section is 1.86_(\u22120.75)^(+0.90) (stat)_(\u22120.26)^(+0.34) (syst)\u00b10.05(lumi) fb, while the summed electroweak and quantum chromodynamic total cross section in the same region is observed to be 5.94_(\u22121.35)^(+1.53) (stat) _(\u22120.37)^(+0.43) (syst) \u00b1 0.13(lumi) fb. Both measurements are consistent with the leading-order standard model predictions. Limits on anomalous quartic gauge couplings are set based on the Z\u03b3 mass distribution.", "doi": "10.1016/j.physletb.2017.04.071", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-07-10", "volume": "770", "pages": "380-402" }, { "id": "authors:76hzr-h8j06", "collection": "authors", "collection_id": "76hzr-h8j06", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-074641871", "type": "article", "title": "Search for heavy gauge W' bosons in events with an energetic lepton and large missing transverse momentum at \u221as = 13 TeV", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for W\u2032 bosons in events with an electron or muon and large missing transverse momentum, using proton\u2013proton collision data at \u221as = 13 TeV collected with the CMS detector in 2015 and corresponding to an integrated luminosity of 2.3 fb^(\u22121). No evidence of an excess of events relative to the standard model expectations is observed. For a W\u2032 boson described by the sequential standard model, upper limits at 95% confidence level are set on the product of the production cross section and branching fraction and lower limits are established on the new boson mass. Masses below 4.1 TeV are excluded combining electron and muon decay channels, significantly improving upon the results obtained with the 8 TeV data. Exclusion limits at 95% confidence level on the product of the W\u2032 production cross section and branching fraction are also derived in combination with the 8 TeV data. Finally, exclusion limits are set for the production of generic W\u2032 bosons decaying into this final state using a model-independent approach.", "doi": "10.1016/j.physletb.2017.04.043", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-07-10", "volume": "770", "pages": "278-301" }, { "id": "authors:1eck3-tjw82", "collection": "authors", "collection_id": "1eck3-tjw82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-071924553", "type": "article", "title": "Measurement of the mass difference between top quark and antiquark in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The invariance of the standard model (SM) under the CPT transformation predicts equality of particle and antiparticle masses. This prediction is tested by measuring the mass difference between the top quark and antiquark (\u0394m_t = m_t \u2212 m_t^\u203e) that are produced in pp collisions at a center-of-mass energy of 8 TeV, using events with a muon or an electron and at least four jets in the final state. The analysis is based on data corresponding to an integrated luminosity of 19.6 fb^(\u22121) collected by the CMS experiment at the LHC, and yields a value of \u0394m_t = \u22120.15 \u00b1 0.19 (stat) \u00b1 0.09 (syst) GeV, which is consistent with the SM expectation. This result is significantly more precise than previously reported measurements.", "doi": "10.1016/j.physletb.2017.04.028", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-07-10", "volume": "770", "pages": "50-71" }, { "id": "authors:fw71h-v3h64", "collection": "authors", "collection_id": "fw71h-v3h64", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171103-095034837", "type": "article", "title": "Coherent J/\u03c8 photoproduction in ultra-peripheral PbPb collisions at \u221as_NN = 2.76 TeV with the CMS experiment", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The cross section for coherent J/\u03c8 photoproduction accompanied by at least one neutron on one side of the interaction point and no neutron activity on the other side, X_(n)0_(n), is measured with the CMS experiment in ultra-peripheral PbPb collisions at \u221as_NN = 2.76 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159 \u03bcb^(\u22121), collected during the 2011 PbPb run. The J/\u03c8 mesons are reconstructed in the dimuon decay channel, while neutrons are detected using zero degree calorimeters. The measured cross section is d\u03c3^(coh)_(X_(n)0_(n))/dy(J/\u03c8) = 0.36 \u00b1 0.04 (stat) \u00b1 0.04 (syst) mb in the rapidity interval 1.8 < |y| < 2.3. Using a model for the relative rate of coherent photoproduction processes, this X_(n)0_(n) measurement gives a total coherent photoproduction cross section of d\u03c3^(coh)/dy(J/\u03c8) = 1.82 \u00b1 0.22 (stat) \u00b1 0.20 (syst) \u00b1 0.19 (theo) mb. The data strongly disfavor the impulse approximation model prediction, indicating that nuclear effects are needed to describe coherent J/\u03c8 photoproduction in \u03b3+Pb interactions. The data are found to be consistent with the leading twist approximation, which includes nuclear gluon shadowing.", "doi": "10.1016/j.physletb.2017.07.001", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-07-08", "volume": "772", "pages": "489-511" }, { "id": "authors:z5y4w-j9p49", "collection": "authors", "collection_id": "z5y4w-j9p49", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171009-133920919", "type": "article", "title": "Search for dark matter produced with an energetic jet or a hadronically decaying W or Z boson at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for dark matter particles is performed using events with large missing transverse momentum, at least one energetic jet, and no leptons, in proton-proton collisions at \u221as = 13 TeV collected with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 12.9 fb^(\u22121) . The search includes events with jets from the hadronic decays of a W or Z boson. The data are found to be in agreement with the predicted background contributions from standard model processes. The results are presented in terms of simplified models in which dark matter particles are produced through interactions involving a vector, axial-vector, scalar, or pseudoscalar mediator. Vector and axial-vector mediator particles with masses up to 1.95 TeV, and scalar and pseudoscalar mediator particles with masses up to 100 and 430 GeV respectively, are excluded at 95% confidence level. The results are also interpreted in terms of the invisible decays of the Higgs\nboson, yielding an observed (expected) 95% confidence level upper limit of 0.44 (0.56) on the corresponding branching fraction. The results of this search provide the strongest constraints on the dark matter pair production cross section through vector and axial-vector mediators at a particle collider. When compared to the direct detection experiments, the limits obtained from this search provide stronger constraints for dark matter masses less than 5, 9, and 550 GeV, assuming vector, scalar, and axial-vector mediators, respectively. The search yields stronger constraints for dark matter masses less than 200 GeV, assuming a pseudoscalar mediator, when compared to the indirect detection results from Fermi-LAT.", "doi": "10.1007/JHEP07(2017)014", "issn": "1029-8479", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-07-05", "series_number": "07", "volume": "2017", "issue": "07", "pages": "Art. No. 014" }, { "id": "authors:7ppx5-maz43", "collection": "authors", "collection_id": "7ppx5-maz43", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171005-074638152", "type": "article", "title": "Search for supersymmetry in the all-hadronic final state\n using top quark tagging in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for supersymmetry in all-hadronic events with missing transverse momentum and tagged top quarks. The data sample was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of \n2.3 fb^(\u22121) of proton-proton collisions at a center-of-mass energy of 13 TeV. Search regions are defined using the properties of reconstructed jets, the multiplicity of bottom and top quark candidates, and an imbalance in transverse momentum. With no statistically significant excess of events observed beyond the expected contributions from the standard model, we set exclusion limits at 95% confidence level on the masses of new particles in the context of simplified models of direct and gluino-mediated top squark production. For direct top squark production with decays to a top quark and a neutralino, top squark masses up to 740 GeV and neutralino masses up to 240 GeV are excluded. Gluino masses up to 1550 GeV and neutralino masses up to 900 GeV are excluded for a gluino-mediated production case, where each of the pair-produced gluinos decays to a top-antitop quark pair and a neutralino.", "doi": "10.1103/PhysRevD.96.012004", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2017-07-01", "series_number": "1", "volume": "96", "issue": "1", "pages": "Art. No. 012004" }, { "id": "authors:22b6d-p7464", "collection": "authors", "collection_id": "22b6d-p7464", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-113042217", "type": "article", "title": "Search for associated production of a Z boson with a single top quark and for tZ avour-changing interactions in pp collisions at at \u221as = 8 TeV", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the production of a single top quark in association with a Z boson is presented, both to identify the expected standard model process and to search for flavour-changing neutral current interactions. The data sample corresponds to an integrated luminosity of 19.7 fb^(\u22121) recorded by the CMS experiment at the LHC in proton-proton collisions at \u221as = 8 TeV. Final states with three leptons (electrons or muons) and at least one jet are investigated. An events yield compatible with tZq standard model production is observed, and the corresponding cross section is measured to be \u03c3(pp\u2009\u2192\u2009tZq\u2009\u2192\u2009\u2113\u03bdb\u2113^+\u2113^\u2212q)\u2009=\u200910_(\u22127)^(+8) fb with a significance of 2.4 standard deviations. No presence of flavour-changing neutral current production of tZq is observed. Exclusion limits at 95% confidence level on the branching fractions of a top quark decaying to a Z boson and an up or a charm quark are found to be \u212c(t\u2009\u2192\u2009Zu)\u2009<\u20090.022% and \u212c(t\u2009\u2192\u2009Zc)\u2009<\u20090.049%.", "doi": "10.1007/JHEP07(2017)003", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-07", "series_number": "7", "volume": "2017", "issue": "7", "pages": "Art. No. 3" }, { "id": "authors:kqnzm-q8907", "collection": "authors", "collection_id": "kqnzm-q8907", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171011-081230618", "type": "article", "title": "Search for new physics with dijet angular distributions in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for extra spatial dimensions, quantum black holes, and quark contact interactions in measurements of dijet angular distributions in proton-proton collisions at \u221as = 13 TeV. The data were collected with the CMS detector at the LHC and correspond to an integrated luminosity of 2.6 fb^(\u22121). The distributions are found to be in agreement with predictions from perturbative quantum chromodynamics that include electroweak corrections. Limits for different contact interaction models are obtained. In a benchmark model, valid to next-to-leading order in QCD and in which only left-handed quarks participate, quark contact interactions are excluded up to a scale of 11.5 and 14.7 TeV for destructive or constructive interference, respectively. The production of quantum black holes is excluded for masses below 7.8 or 5.3 TeV, depending on the model. The lower limits for the scales of virtual graviton exchange in the Arkani-Hamed-Dimopoulos-Dvali model of extra spatial dimensions are in the range 7.9\u201311.2 TeV, and are the most stringent set of limits available.", "doi": "10.1007/JHEP07(2017)013", "issn": "1029-8479", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-07", "series_number": "7", "volume": "2017", "issue": "7", "pages": "Art. No. 013" }, { "id": "authors:fhrgj-q4284", "collection": "authors", "collection_id": "fhrgj-q4284", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171017-094638917", "type": "article", "title": "Measurement of the jet mass in highly boosted t t-bar events from pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The first measurement of the jet mass m_jet of top quark jets produced in t t-bar events from pp collisions at \u221as = 8 TeV is reported for the jet with the largest transverse momentum p_T in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.7 fb^(\u22121). The measurement is performed in the lepton+jets channel in which the products of the semileptonic decay t \u2192 bW with W \u2192 \u2113v where \u2113 is an electron or muon, are used to select t t-bar events with large Lorentz boosts. The products of the fully hadronic decay t \u2192 bW with W \u2192 q q-bar' are reconstructed using a single Cambridge\u2013Aachen jet with distance parameter R = 1.2, and p_T > 400 GeV. The t t-bar cross section as a function of m_jet is unfolded at the particle level and is used to test the modelling of highly boosted top quark production. The peak position of the m_jet distribution is sensitive to the top quark mass m_t, and the data are used to extract a value of m_t to assess this sensitivity.", "doi": "10.1140/epjc/s10052-017-5030-3", "pmcid": "PMC5586970", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-07", "series_number": "7", "volume": "77", "issue": "7", "pages": "Art. No. 467" }, { "id": "authors:q6qxw-fet61", "collection": "authors", "collection_id": "q6qxw-fet61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171106-090616573", "type": "article", "title": "Search for high-mass Z\u03b3 resonances in proton-proton collisions at \u221as = 8 and 13 TeV using jet substructure techniques", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for massive resonances decaying to a Z boson and a photon is performed in events with a hadronically decaying Z boson candidate, separately in light-quark and b quark decay modes, identified using jet substructure and advanced b tagging techniques. Results are based on samples of proton-proton collisions collected with the CMS detector at the LHC at center-of-mass energies of 8 and 13 TeV, corresponding to integrated luminosities of 19.7 and 2.7 fb^(\u22121), respectively. The results of the search are combined with those of a similar search in the leptonic decay modes of the Z boson, based on the same data sets. Spin-0 resonances with various widths and with masses in a range between 0.2and 3.0 TeV are considered. No significant excess is observed either in the individual analyses or the combination. The results are presented in terms of upper limits on the production cross section of such resonances and constitute the most stringent limits to date for a wide range of masses.", "doi": "10.1016/j.physletb.2017.06.062", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-06-28", "volume": "772", "pages": "363-387" }, { "id": "authors:5v15n-nhr33", "collection": "authors", "collection_id": "5v15n-nhr33", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171103-120952011", "type": "article", "title": "Search for standard model production of four top quarks in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for events containing four top quarks (tt-bar tt-bar) is reported from proton\u2013proton collisions recorded by the CMS experiment at \u221as = 13 TeV and corresponding to an integrated luminosity of 2.6 fb^(\u22121). The analysis considers the single-lepton (e or \u03bc)+jets and the opposite-sign dilepton (\u03bc^+ \u03bc^\u2212, \u03bc^\u00b1 e^\u2213, or e^+ e^\u2212)+jets channels. It uses boosted decision trees to combine information on the global event and jet properties to distinguish between tt-bar tt-bar and tt-bar production. The number of events observed after all selection requirements is consistent with expectations from background and standard model signal predictions, and an upper limit is set on the cross section for tt-bar tt-bar production in the standard model of 94 fb at 95% confidence level (10.2 x the prediction), with an expected limit of 118 fb. This is combined with the results from the published CMS search in the same-sign dilepton channel, resulting in an improved limit of 69 fb at 95% confidence level (7.4 x the prediction), with an expected limit of 71 fb. These are the strongest constraints on the rate of tt-bar tt-bar production to date.", "doi": "10.1016/j.physletb.2017.06.064", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-06-28", "volume": "772", "pages": "336-358" }, { "id": "authors:mm3qj-7d561", "collection": "authors", "collection_id": "mm3qj-7d561", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171002-092736969", "type": "article", "title": "Search for supersymmetry in events with photons and missing transverse energy in pp collisions at 13 TeV", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The results of a search for new physics in final states with photons and missing transverse energy are reported. The study is based on a sample of proton\u2013proton collisions collected at a center-of-mass energy of 13 TeV with the CMS detector in 2015, corresponding to an integrated luminosity of 2.3 fb\u22121. Final states with two photons and significant missing transverse energy are used to search for supersymmetric particles in models of supersymmetry (SUSY) with general gauge-mediated (GGM) supersymmetry breaking. No excess is observed with respect to the standard model expectation, and the results are used to set limits on gluino pair production and squark pair production in the GGM SUSY framework. Gluino masses below 1.65 TeV and squark masses below 1.37 TeV are excluded at a 95% confidence level.", "doi": "10.1016/j.physletb.2017.04.005", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-06-10", "volume": "769", "pages": "391-412" }, { "id": "authors:n4pek-tw318", "collection": "authors", "collection_id": "n4pek-tw318", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171003-073051758", "type": "article", "title": "Search for dijet resonances in proton\u2013proton collisions at \u221as = 13 TeV and constraints on dark matter and other models", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for narrow resonances decaying to dijet final states in proton\u2013proton collisions at \u221as = 13 TeV using data corresponding to an integrated luminosity of 12.9\u2009fb^(\u22121). The dijet mass spectrum is well described by a smooth parameterization and no significant evidence for the production of new particles is observed. Upper limits at 95% confidence level are reported on the production cross section for narrow resonances with masses above 0.6\u2009TeV. In the context of specific models, the limits exclude string resonances with masses below 7.4\u2009TeV, scalar diquarks below 6.9\u2009TeV, axigluons and colorons below 5.5\u2009TeV, excited quarks below 5.4\u2009TeV, color-octet scalars below 3.0\u2009TeV, W\u2032 bosons below 2.7\u2009TeV, Z\u2032 bosons below 2.1\u2009TeV and between 2.3 and 2.6\u2009TeV, and RS gravitons below 1.9\u2009TeV. These extend previous limits in the dijet channel. Vector and axial-vector mediators in a simplified model of interactions between quarks and dark matter are excluded below 2.0\u2009TeV. The first limits in the dijet channel on dark matter mediators are presented as functions of dark matter mass and are compared to the exclusions of dark matter in direct detection experiments.", "doi": "10.1016/j.physletb.2017.02.012", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-06-10", "volume": "769", "pages": "520-542" }, { "id": "authors:8v9j4-4ce61", "collection": "authors", "collection_id": "8v9j4-4ce61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171011-131216560", "type": "article", "title": "Measurement of electroweak-induced production of W\u03b3 with two jets in pp collisions at \u221as = 8 TeV and constraints on anomalous quartic gauge couplings", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of electroweak-induced production of W\u03b3 and two jets is performed, where the W boson decays leptonically. The data used in the analysis correspond to an integrated luminosity of 19.7 fb^(\u22121) collected by the CMS experiment in \u221as = 8 TeV proton-proton collisions produced at the LHC. Candidate events are selected with exactly one muon or electron, missing transverse momentum, one photon, and two jets with large rapidity separation. An excess over the hypothesis of the standard model without electroweak production of W\u03b3 with two jets is observed with a significance of 2.7 standard deviations. The cross section measured in the fiducial region is 10.8 \u00b1 4.1(stat) \u00b1 3.4(syst) \u00b1 0.3(lumi) fb, which is consistent with the standard model electroweak prediction. The total cross section for W\u03b3 in association with two jets in the same fiducial region is measured to be 23.2 \u00b1 4.3(stat) \u00b1 1.7(syst) \u00b1 0.6(lumi) fb, which is consistent with the standard model prediction from the combination of electroweak and quantum chromodynamics-induced processes. No deviations are observed from the standard model predictions and experimental limits on anomalous quartic gauge couplings fM,0\u22127/\u039b^4, fT,0\u22122/\u039b^4, and fT,5\u22127/\u039b^4 are set at 95% confidence level.", "doi": "10.1007/JHEP06(2017)106", "issn": "1029-8479", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-06", "series_number": "06", "volume": "2017", "issue": "06", "pages": "Art. No. 106" }, { "id": "authors:s3e97-mt428", "collection": "authors", "collection_id": "s3e97-mt428", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171011-154928078", "type": "article", "title": "Measurement of the top quark mass using single top quark events in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the top quark mass is reported in events containing a single top quark produced via the electroweak t channel. The analysis is performed using data from proton-proton collisions collected with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb^(\u22121). Top quark candidates are reconstructed from their decay to a W boson and a b quark, with the W boson decaying leptonically to a muon and a neutrino. The final state signature and kinematic properties of single top quark events in the t channel are used to enhance the purity of the sample, suppressing the contribution from top quark pair production. Afit to the invariant mass distribution of reconstructed top quark candidates yields a value of the top quark mass of 172.95 \u00b1 0.77 (stat)^(+0.97)_(\u22120.93) (syst) GeV. This result is in agreement with the current world average, and represents the first measurement of the top quark mass in event topologies not dominated by top quark pair production, therefore contributing to future averages with partially uncorrelated systematic uncertainties and a largely uncorrelated statistical uncertainty.", "doi": "10.1140/epjc/s10052-017-4912-8", "pmcid": "PMC5586548", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-05-29", "series_number": "5", "volume": "77", "issue": "5", "pages": "Art. No. 354" }, { "id": "authors:mq45s-jmh19", "collection": "authors", "collection_id": "mq45s-jmh19", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171013-164932553", "type": "article", "title": "Searches for pair production of third-generation squarks in \u221as = 13 TeV pp collisions", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Searches are presented for direct production of top or bottom squark pairs in proton\u2013proton collisions at the CERN LHC. Two searches, based on complementary techniques, are performed in all-jet final states that are characterized by a significant imbalance in transverse momentum. An additional search requires the presence of a charged lepton isolated from other activity in the event. The data were collected in 2015 at a centre-of-mass energy of 13 TeV with the CMS detector and correspond to an integrated luminosity of 2.3 fb^(\u22121). No statistically significant excess of events is found beyond the expected contribution from standard model processes. Exclusion limits are set in the context of simplified models of top or bottom squark pair production. Models with top and bottom squark masses up to 830 and 890 GeV, respectively, are probed for light neutralinos. For models with top squark masses of 675 GeV, neutralino masses up to 260 GeV are excluded at 95% confidence level.", "doi": "10.1140/epjc/s10052-017-4853-2", "pmcid": "PMC5586332", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-05-18", "series_number": "5", "volume": "77", "issue": "5", "pages": "Art. No. 327" }, { "id": "authors:knztv-ztv80", "collection": "authors", "collection_id": "knztv-ztv80", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171002-132748120", "type": "article", "title": "Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.-C.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for heavy resonances decaying to a Higgs boson and a vector boson is presented. The analysis is performed using data samples collected in 2015 by the CMS experiment at the LHC in proton\u2013proton collisions at a center-of-mass energy of 13\u2009TeV, corresponding to integrated luminosities of 2.2\u20132.5\u2009fb^(\u22121). The search is performed in channels in which the vector boson decays into leptonic final states (Z\u2192\u03bd\u03bd, W\u2192\u2113\u03bd, and Z\u2192\u2113\u2113, with \u2113=e,\u03bc), while the Higgs boson decays to collimated b quark pairs detected as a single massive jet. The discriminating power of a jet mass requirement and a b jet tagging algorithm are exploited to suppress the standard model backgrounds. The event yields observed in data are consistent with the background expectation. In the context of a theoretical model with a heavy vector triplet, a resonance with mass less than 2\u2009TeV is excluded at 95% confidence level. The results are also interpreted in terms of limits on the parameters of the model, improving on the reach of previous searches.", "doi": "10.1016/j.physletb.2017.02.040", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-05-10", "volume": "768", "pages": "137-162" }, { "id": "authors:xetsr-m3344", "collection": "authors", "collection_id": "xetsr-m3344", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171003-101113969", "type": "article", "title": "Search for narrow resonances in dilepton mass spectra in proton\u2013proton collisions at \u221as = 13 TeV and combination with 8 TeV data", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for narrow resonances in dielectron and dimuon invariant mass spectra has been performed using data obtained from proton\u2013proton collisions at \u221as = 13 TeV collected with the CMS detector. The integrated luminosity for the dielectron sample is 2.7 fb\u22121 and for the dimuon sample 2.9 fb^(\u22121). The sensitivity of the search is increased by combining these data with a previously analyzed set of data obtained at \u221as = 8 TeV and corresponding to a luminosity of 20 fb^(\u22121). No evidence for non-standard-model physics is found, either in the 13 TeV data set alone, or in the combined data set. Upper limits on the product of production cross section and branching fraction have also been calculated in a model-independent manner to enable interpretation in models predicting a narrow dielectron or dimuon resonance structure. Limits are set on the masses of hypothetical particles that could appear in new-physics scenarios. For the Z_(SSM)^\u2032 particle, which arises in the sequential standard model, and for the superstring inspired Z_\u03c8^\u2032 particle, 95% confidence level lower mass limits for the combined data sets and combined channels are found to be 3.37 and 2.82 TeV, respectively. The corresponding limits for the lightest Kaluza\u2013Klein graviton arising in the Randall\u2013Sundrum model of extra dimensions with coupling parameters 0.01 and 0.10 are 1.46 and 3.11 TeV, respectively. These results significantly exceed the limits based on the 8 TeV LHC data.", "doi": "10.1016/j.physletb.2017.02.010", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-05-10", "volume": "768", "pages": "57-80" }, { "id": "authors:9ctyf-qs491", "collection": "authors", "collection_id": "9ctyf-qs491", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171002-141509329", "type": "article", "title": "Multiplicity and rapidity dependence of strange hadron production inpp, pPb, and PbPb collisions at the LHC", "author": [ { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of strange hadron (K^0_s, \u039b + \u039b \u039e^- + \u039e^+) transverse momentum spectra in pp, pPb, and PbPb collisions are presented over a wide range of rapidity and event charged-particle multiplicity. The data were collected with the CMS detector at the CERN LHC in pp collisions at \u221as = 7 TeV, pPb collisions at \u221asNN = 5.02 TeV, and PbPb collisions at \u221asNN = 2.76 TeV. The average transverse kinetic energy is found to increase with multiplicity, at a faster rate for heavier strange particle species in all systems. At similar multiplicities, the difference in average transverse kinetic energy between different particle species is observed to be larger for pp and pPb events than for PbPb events. In pPb collisions, the average transverse kinetic energy is found to be slightly larger in the Pb-going direction than in the p-going direction for events with large multiplicity. The spectra are compared to models motivated by hydrodynamics.", "doi": "10.1016/j.physletb.2017.01.075", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-05-10", "volume": "768", "pages": "103-129" }, { "id": "authors:6907p-qpk04", "collection": "authors", "collection_id": "6907p-qpk04", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171010-154511669", "type": "article", "title": "A search for new phenomena in pp collisions at \u221as = 13 TeV in final states with missing transverse momentum and at least one jet using the \u03b1T variable", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new phenomena is performed in final states containing one or more jets and an imbalance in transverse momentum in pp collisions at a centre-of-mass energy of 13 TeV. The analysed data sample, recorded with the CMS detector at the CERN LHC, corresponds to an integrated luminosity of 2.3 fb^(\u22121). Several kinematic variables are employed to suppress the dominant background, multijet production, as well as to discriminate between other standard model and new physics processes. The search provides sensitivity to a broad range of new-physics models that yield a stable weakly interacting massive particle. The number of observed candidate events is found to agree with the expected contributions from standard model processes, and the result is interpreted in the mass parameter space of fourteen simplified supersymmetric models that assume the pair production of gluinos or squarks and a range of decay modes. For models that assume gluino pair production, masses up to 1575 and 975 GeV are excluded for gluinos and neutralinos, respectively. For models involving the pair production of top squarks and compressed mass spectra, top squark masses up to 400 GeV are excluded.", "doi": "10.1140/epjc/s10052-017-4787-8", "pmcid": "PMC5435128", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-05-08", "series_number": "5", "volume": "77", "issue": "5", "pages": "Art. No. 294" }, { "id": "authors:tr59y-epr78", "collection": "authors", "collection_id": "tr59y-epr78", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171005-111335239", "type": "article", "title": "Measurement of differential cross sections for top quark pair production using the lepton + jets final state in proton-proton collisions at 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Differential and double-differential cross sections for the production of top quark pairs in proton-proton collisions at 13 TeV are measured as a function of jet multiplicity and of kinematic variables of the top quarks and the top quark-antiquark system. This analysis is based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 2.3 fb^(\u22121). The measurements are performed in the lepton + jets decay channels with a single muon or electron in the final state. The differential cross sections are presented at particle level, within a phase space close to the experimental acceptance, and at parton level in the full phase space. The results are compared to several standard model predictions.", "doi": "10.1103/PhysRevD.95.092001", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2017-05-01", "series_number": "9", "volume": "95", "issue": "9", "pages": "Art. No. 092001" }, { "id": "authors:5pkhc-hkc38", "collection": "authors", "collection_id": "5pkhc-hkc38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171009-130358703", "type": "article", "title": "Observation of Y(1S) pair production in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Pair production of Y(1S) mesons is observed at the LHC in proton-proton collisions at \u221as = 8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb^(\u22121). Both Y(1S) candidates are fully reconstructed via their decays to \u03bc^+\u03bc^\u2212. The fiducial acceptance region is defined by an absolute Y(1S) rapidity smaller than 2.0. The fiducial cross section for the production of Y(1S) pairs, assuming that both mesons decay isotropically, is measured to be 68.8\u00b112.7 (stat)\u00b17.4 (syst)\u00b12.8 (B) pb, where the third uncertainty comes from the uncertainty in the branching fraction of Y(1S) decays to \u03bc^+\u03bc^\u2212. Assuming instead that the Y(1S) mesons are produced with different polarizations leads to variations in the measured cross section in the range from \u221238% to +36%.", "doi": "10.1007/JHEP05(2017)013", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-05", "series_number": "05", "volume": "2017", "issue": "05", "pages": "Art. No. 013" }, { "id": "authors:h8wmc-91q58", "collection": "authors", "collection_id": "h8wmc-91q58", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171011-140355520", "type": "article", "title": "Search for single production of vector-like quarks decaying to a Z boson and a top or a bottom quark in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for single production of vector-like quarks, T and B, decaying into a Z boson and a top or a bottom quark, respectively, is presented. The search is performed using data collected by the CMS experiment at the LHC in proton-proton collisions at \u221as = 13 TeV, corresponding to an integrated luminosity of 2.3fb^(\u22121). An exotic T quark production mode through the decay of a heavy Z\u2032 resonance is also considered. The search is performed in events with a Z boson decaying leptonically, accompanied by a bottom or a top quark decaying hadronically. No excess of events is observed over the standard model background expectation. Products of production cross section and branching fraction for T and B quarks from 1.26 and 0.13 pb are excluded at 95% confidence level for the range of resonance mass considered, which is between 0.7 and 1.7 TeV. Limits on the product of the Z\u2032 boson production cross section and branching fraction, with the Z\u2032 boson decaying to the Tt final state, are set between 0.31 and 0.13 pb, for Z\u2032 boson masses in the range from 1.5 to 2.5 TeV. This is the first search at 13 TeV for single production of vector-like quarks in events with a Z boson decaying leptonically accompanied by boosted jets.", "doi": "10.1007/JHEP05(2017)029", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-05", "series_number": "05", "volume": "2017", "issue": "05", "pages": "Art. No. 029" }, { "id": "authors:f3psk-67j82", "collection": "authors", "collection_id": "f3psk-67j82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171010-122738466", "type": "article", "title": "Search for electroweak production of a vector-like quark decaying to a top quark and a Higgs boson using boosted topologies in fully hadronic final states", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for electroweak production of a vector-like top quark partner T of charge 2/3 in association with a standard model top or bottom quark, using 2.3 fb^(\u22121) of proton-proton collision data at s\u221a=13 TeV collected by the CMS experiment at the CERN LHC. The search targets T quarks decaying to a top quark and a Higgs boson in fully hadronic final states. For a T quark with mass above 1 TeV the daughter top quark and Higgs boson are highly Lorentz-boosted and can each appear as a single hadronic jet. Jet substructure and b tagging techniques are used to identify the top quark and Higgs boson jets, and to suppress the standard model backgrounds. An excess of events is searched for in the T quark candidate mass distribution in the data, which is found to be consistent with the expected backgrounds. Upper limits at 95% confidence level are set on the product of the single T quark production cross sections and the branching fraction B(T\u2192tH), and these vary between 0.31 and 0.93 pb for T quark masses in the range 1000-1800 GeV. This is the first search for single electroweak production of a vector-like T quark in fully hadronic final states.", "doi": "10.1007/JHEP04(2017)136", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-04-21", "series_number": "4", "volume": "2017", "issue": "4", "pages": "Art No. 136" }, { "id": "authors:2j6e9-nxb96", "collection": "authors", "collection_id": "2j6e9-nxb96", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171005-132153292", "type": "article", "title": "Relative Modification of Prompt \u03c8(2S) and J/\u03c8 Yields from pp to PbPb Collisions at \u221as_NN = 5.02\u2009\u2009TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The relative modification of the prompt \u03c8(2S) and J/\u03c8 yields from pp to PbPb collisions, at the center-of-mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples collected by the CMS experiment at the LHC in 2015, corresponding to integrated luminosities of 28.0 pb^(\u22121) and 464 \u03bcb^(\u22121), respectively. The double ratio of measured yields of prompt charmonia reconstructed through their decays into muon pairs, (N_\u03c8(2S)/N_J/\u03c8)_PbPb/(N_\u03c8(2S)/N_J/\u03c8)_pp, is determined as a function of PbPb collision centrality and charmonium transverse momentum p_T, in two kinematic intervals: |y| < 1.6 covering 6.5 < p_T < 30 GeV/c and 1.6 < |y| < 2.4 covering 3 < p_T < 30 GeV/c. The centrality-integrated double ratios are 0.36 \u00b1 0.08 (stat) \u00b1 0.05 (syst) in the first interval and 0.24 \u00b1 0.22 (stat) \u00b1 0.09 (syst) in the second. The double ratio is lower than unity in all the measured bins, suggesting that the \u03c8(2S) yield is more suppressed than the J/\u03c8 yield in the explored phase space.", "doi": "10.1103/PhysRevLett.118.162301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2017-04-20", "series_number": "16", "volume": "118", "issue": "16", "pages": "Art. No. 162301" }, { "id": "authors:dx4yp-c4268", "collection": "authors", "collection_id": "dx4yp-c4268", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171009-092833620", "type": "article", "title": "Suppression and azimuthal anisotropy of prompt and nonprompt J/\u03c8 production in PbPb collisions at \u221a(s_N N) = 2.76 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The nuclear modification factor R_(AA) and the azimuthal anisotropy coefficient v_2 of prompt and nonprompt (i.e. those from decays of b hadrons) J/\u03c8 mesons, measured from PbPb and pp collisions at \u221a(s_NN) = 2.76 TeV at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta p_T > 6.5 GeV/c and rapidity |y| < 2.4, extending down to p_T = 3 GeV/c in the 1.6 < |y| < 2.4 range. The v_2 of prompt J/\u03c8 is found to be nonzero, but with no strong dependence on centrality, rapidity, or p_T over the full kinematic range studied. The measured v_2 of nonprompt J/\u03c8 is consistent with zero. The R_(AA) of prompt J/\u03c8 exhibits a suppression that increases from peripheral to central collisions but does not vary strongly as a function of either y or p_T in the fiducial range. The nonprompt J/\u03c8 R_(AA) shows a suppression which becomes stronger as rapidity or p_T increases. The v_2 and R_(AA) of open and hidden charm, and of open charm and beauty, are compared.", "doi": "10.1140/epjc/s10052-017-4781-1", "pmcid": "PMC5409806", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-04-19", "series_number": "4", "volume": "77", "issue": "4", "pages": "Art. No. 252" }, { "id": "authors:ys8c2-zf918", "collection": "authors", "collection_id": "ys8c2-zf918", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171009-144920920", "type": "article", "title": "Measurement of the WZ production cross section in pp collisions at \u221as = 7 and 8 TeV and search for anomalous triple gauge couplings at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The WZ production cross section is measured by the CMS experiment at the CERN LHC in proton-proton collision data samples corresponding to integrated luminosities of 4.9 fb^(\u22121) collected at \u221as = 7 TeV, and 19.6 fb^(\u22121) at \u221as = 8 TeV. The measurements are performed using the fully-leptonic WZ decay modes with electrons and muons in the final state. The measured cross sections for 71 < m_Z < 111 GeV are \u03c3(pp \u2192 WZ; \u221as = 7 TeV) = 20.14 \u00b1 1.32 (stat) \u00b1 0.38 (theo) \u00b1 1.06 (exp) \u00b1 0.44 (lumi) pb and \u03c3(pp \u2192 WZ; \u221as = 8 TeV) = 24.09 \u00b1 0.87 (stat) \u00b1 0.80 (theo) \u00b1 1.40 (exp) \u00b1 0.63 (lumi) pb. Differential cross sections with respect to the Z boson p_T, the leading jet p_T, and the number of jets are obtained using the \u221as = 8 TeV data. The results are consistent with standard model predictions and constraints on anomalous triple gauge couplings are obtained.", "doi": "10.1140/epjc/s10052-017-4730-z", "pmcid": "PMC5409800", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-04-12", "series_number": "4", "volume": "77", "issue": "4", "pages": "Art No. 236" }, { "id": "authors:rgq4c-rtt57", "collection": "authors", "collection_id": "rgq4c-rtt57", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170929-112723216", "type": "article", "title": "Search for high-mass diphoton resonances in proton\u2013proton collisions at 13 TeV and combination with 8 TeV search", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the resonant production of high-mass photon pairs is presented. The search focuses on spin-0 and spin-2 resonances with masses between 0.5 and 4.5 TeV, and with widths, relative to the mass, between 1.4\u00d710^(\u22124) and 5.6\u00d710^(\u22122). The data sample corresponds to an integrated luminosity of 12.9 fb^(\u22121) of proton\u2013proton collisions collected with the CMS detector in 2016 at a center-of-mass energy of 13 TeV. No significant excess is observed relative to the standard model expectation. The results of the search are combined statistically with those previously obtained in 2012 and 2015 at \u221as = 8 and 13 TeV, respectively, corresponding to integrated luminosities of 19.7 and 3.3 fb^(\u22121), to derive exclusion limits on scalar resonances produced through gluon\u2013gluon fusion, and on Randall\u2013Sundrum gravitons. The lower mass limits for Randall\u2013Sundrum gravitons range from 1.95 to 4.45 TeV for coupling parameters between 0.01 and 0.2. These are the most stringent limits on Randall\u2013Sundrum graviton production to date.", "doi": "10.1016/j.physletb.2017.01.027", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-04-10", "volume": "767", "pages": "147-170" }, { "id": "authors:a664z-2m392", "collection": "authors", "collection_id": "a664z-2m392", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170929-103427892", "type": "article", "title": "Search for top squark pair production in compressed-mass-spectrum scenarios in proton\u2013proton collisions \u221a8 TeV using the \u03b1_T variable", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "An inclusive search is performed for supersymmetry in final states containing jets and an apparent imbalance in transverse momentum, p^\u2192miss_T, due to the production of unobserved weakly interacting particles in pp collisions at a centre-of-mass energy of 8TeV. The data, recorded with the CMS detector at the CERN LHC, correspond to an integrated luminosity of 18.5fb^\u22121. The dimensionless kinematic variable \u03b1_T is used to discriminate between events with genuine p^\u2192miss_T associated with unobserved particles and spurious values of p^\u2192miss_T arising from jet energy mismeasurements. No excess of event yields above the expected standard model backgrounds is observed. The results are interpreted in terms of constraints on the parameter space of several simplified models of supersymmetry that assume the pair production of top squarks. The search provides sensitivity to a broad range of top squark (\u02dct) decay modes, including the two-body decay \u02dct\u2192c\u02dc\u03c7^0_1, where c is a charm quark and \u02dc\u03c7^0_1 is the lightest neutralino, as well as the four-body decay \u02dct\u2192bf\u00aff'\u02dc\u03c7^0_1, where b is a bottom quark and fand \u00aff' are fermions produced in the decay of an intermediate off-shell W boson. These modes dominate in scenarios in which the top squark and lightest neutralino are nearly degenerate in mass. For these modes, top squarks with masses as large as 260 and 225 GeV are excluded, respectively, for the two-and four-body decays.", "doi": "10.1016/j.physletb.2017.02.007", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-04-10", "volume": "767", "pages": "403-430" }, { "id": "authors:hetc0-qgv78", "collection": "authors", "collection_id": "hetc0-qgv78", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171006-110014252", "type": "article", "title": "Charged-particle nuclear modification factors in PbPb and pPb collisions at \u221a(s_N N) = 5.02 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The spectra of charged particles produced within the pseudorapidity window |\u03b7| < 1 at \u221a(s_N N) = 5.02 TeV are measured using 404 \u03bcb^(\u22121) of PbPb and 27.4 pb^(\u22121) of pp data collected by the CMS detector at the LHC in 2015. The spectra are presented over the transverse momentum ranges spanning 0.5 < p_T < 400 GeV in pp and 0.7 < p_T < 400 GeV in PbPb collisions. The corresponding nuclear modification factor, R_AA, is measured in bins of collision centrality. The R_AA in the 5% most central collisions shows a maximal suppression by a factor of 7-8 in the p_T region of 6-9 GeV. This dip is followed by an increase, which continues up to the highest p_T measured, and approaches unity in the vicinity of p_T = 200 GeV. The R_AA is compared to theoretical predictions and earlier experimental results at lower collision energies. The newly measured pp spectrum is combined with the pPb spectrum previously published by the CMS collaboration to construct the pPb nuclear modification factor, R_pA, up to 120 GeV. For p_T > 20 GeV, R_pA exhibits weak momentum dependence and shows a moderate enhancement above unity.", "doi": "10.1007/JHEP04(2017)039", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-04-07", "series_number": "4", "volume": "2017", "issue": "4", "pages": "Art. No. 39" }, { "id": "authors:we4ws-kyv93", "collection": "authors", "collection_id": "we4ws-kyv93", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171003-150207609", "type": "article", "title": "Measurements of differential production cross sections for a Z boson in association with jets in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Cross sections for the production of a Z boson in association with jets in proton-proton collisions at a centre-of-mass energy of \u221as=8 TeV are measured using a data sample collected by the CMS experiment at the LHC corresponding to 19.6 fb^(\u22121). Differential cross sections are presented as functions of up to three observables that describe the jet kinematics and the jet activity. Correlations between the azimuthal directions and the rapidities of the jets and the Z boson are studied in detail. The predictions of a number of multileg generators with leading or next-to-leading order accuracy are compared with the measurements. The comparison shows the importance of including multi-parton contributions in the matrix elements and the improvement in the predictions when next-to-leading order terms are included.", "doi": "10.1007/JHEP04(2017)022", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-04", "series_number": "04", "volume": "2017", "issue": "04", "pages": "Art. No. 022" }, { "id": "authors:1trvx-as969", "collection": "authors", "collection_id": "1trvx-as969", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171006-141319246", "type": "article", "title": "Measurement of prompt and nonprompt J/\u03c8 production in pp and pPb collisions at \u221asNN = 5.02 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper reports the measurement of J/\u03c8 meson production in proton\u2013proton (pp) and proton\u2013lead (pPb) collisions at a center-of-mass energy per nucleon pair of 5.02TeV by the CMS experiment at the LHC. The data samples used in the analysis correspond to integrated luminosities of 28pb^(\u22121) and 35nb^(\u22121) for pp and pPb collisions, respectively. Prompt and nonprompt J/\u03c8 mesons, the latter produced in the decay of B hadrons, are measured in their dimuon decay channels. Differential cross sections are measured in the transverse momentum range of 2", "doi": "10.1140/epjc/s10052-017-4828-3", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-04", "volume": "77", "pages": "Art. No. 269" }, { "id": "authors:z469x-rr047", "collection": "authors", "collection_id": "z469x-rr047", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171005-135025653", "type": "article", "title": "Search for electroweak production of charginos in final states with two \u03c4 leptons in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for the electroweak production of supersymmetric particles in pp collisions in final states with two \u03c4 leptons. The data sample corresponds to an integrated luminosity between 18.1 fb^(\u22121) and 19.6 fb^(\u22121) depending on the final state of \u03c4 lepton decays, at \u221as=8 TeV, collected by the CMS experiment at the LHC. The observed event yields in the signal regions are consistent with the expected standard model backgrounds. The results are interpreted using simplified models describing the pair production and decays of charginos or \u03c4 sleptons. For models describing the pair production of the lightest chargino, exclusion regions are obtained in the plane of chargino mass vs. neutralino mass under the following assumptions: the chargino decays into third-generation sleptons, which are taken to be the lightest sleptons, and the sleptons masses lie midway between those of the chargino and the neutralino. Chargino masses below 420 GeV are excluded at a 95% confidence level in the limit of a massless neutralino, and for neutralino masses up to 100 GeV, chargino masses up to 325 GeV are excluded at 95% confidence level. Constraints are also placed on the cross section for pair production of \u03c4 sleptons as a function of mass, assuming a massless neutralino.", "doi": "10.1007/JHEP04(2017)018", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-04", "series_number": "04", "volume": "2017", "issue": "04", "pages": "Art. No. 018" }, { "id": "authors:as5r6-mtq24", "collection": "authors", "collection_id": "as5r6-mtq24", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171018-143721678", "type": "article", "title": "Mechanical stability of the CMS strip tracker measured with a laser alignment system", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS tracker consists of 206 m^2 of silicon strip sensors assembled on carbon fibre composite structures and is designed for operation in the temperature range from \u221225 to +25\u00b0C. The mechanical stability of tracker components during physics operation was monitored with a few \u03bcm resolution using a dedicated laser alignment system as well as particle tracks from cosmic rays and hadron-hadron collisions. During the LHC operational period of 2011\u20132013 at stable temperatures, the components of the tracker were observed to experience relative movements of less than 30\u03bcm. In addition, temperature variations were found to cause displacements of tracker structures of about 2\u03bcm\u00b0C, which largely revert to their initial positions when the temperature is restored to its original value.", "doi": "10.1088/1748-0221/12/04/P04023", "issn": "1748-0221", "publisher": "IOP Publishing", "publication": "Journal of Instrumentation", "publication_date": "2017-04", "volume": "12", "pages": "Art. No. P04023" }, { "id": "authors:hyryj-xmh35", "collection": "authors", "collection_id": "hyryj-xmh35", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171005-084553667", "type": "article", "title": "Measurement and QCD analysis of double-differential inclusive jet cross sections in pp collisions at \u221as = 8 TeV and cross section ratios to 2.76 and 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the double-differential inclusive jet cross section as a function of the jet transverse momentum pT and the absolute jet rapidity |y| is presented. Data from LHC proton-proton collisions at \u221a s =8 TeV, corresponding to an integrated luminosity of 19.7 fb^(\u22121), have been collected with the CMS detector. Jets are reconstructed using the anti-k_T clustering algorithm with a size parameter of 0.7 in a phase space region covering jet p_T from 74 GeV up to 2.5 TeV and jet absolute rapidity up to |y| = 3.0. The low-p_T jet range between 21 and 74 GeV is also studied up to |y| = 4.7, using a dedicated data sample corresponding to an integrated luminosity of 5.6 pb^(\u22121). The measured jet cross section is corrected for detector effects and compared with the predictions from perturbative QCD at next-to-leading order (NLO) using various sets of parton distribution functions (PDF). Cross section ratios to the corresponding measurements performed at 2.76 and 7 TeV are presented. From the measured double-differential jet cross section, the value of the strong coupling constant evaluated at the Z mass is \u03b1S (M_Z)\u2009=\u20090.1164^(+\u20090.0060)_(\u2212\u20090.0043), where the errors include the PDF, scale, nonperturbative effects and experimental uncertainties, using the CT10 NLO PDFs. Improved constraints on PDFs based on the inclusive jet cross section measurement are presented.", "doi": "10.1007/JHEP03(2017)156", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-03-29", "series_number": "3", "volume": "2017", "issue": "3", "pages": "Art. No. 156" }, { "id": "authors:2ssjf-4ef71", "collection": "authors", "collection_id": "2ssjf-4ef71", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170929-150643962", "type": "article", "title": "Observation of Charge-Dependent Azimuthal Correlations in p-Pb Collisions and Its Implication for the Search for the Chiral Magnetic Effect", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |\u03b7| < 2.4, and a third particle measured in the hadron forward calorimeters (4.4 < |\u03b7| < 5). The observed differences between the same and opposite sign correlations, as functions of multiplicity and \u03b7 gap between the two charged particles, are of similar magnitude in p-Pb and PbPb collisions at the same multiplicities. These results pose a challenge for the interpretation of charge-dependent azimuthal correlations in heavy ion collisions in terms of the chiral magnetic effect.", "doi": "10.1103/PhysRevLett.118.122301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2017-03-24", "series_number": "12", "volume": "118", "issue": "12", "pages": "Art. No. 122301" }, { "id": "authors:x3yxm-d6p09", "collection": "authors", "collection_id": "x3yxm-d6p09", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-155612916", "type": "article", "title": "Measurement of the t t-bar production cross section using events in the e\u03bc final state in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The cross section of top quark-antiquark pair production in proton\u2013proton collisions at \u221as = 13 TeV is measured by the CMS experiment at the LHC, using data corresponding to an integrated luminosity of 2.2 fb^(\u22121) . The measurement is performed by analyzing events in which the final state includes one electron, one muon, and two or more jets, at least one of which is identified as originating from hadronization of a b quark. The measured cross section is 815 \u00b19 (stat) \u00b1 38 (syst) \u00b1 19 (lumi) pb, in agreement with the expectation from the standard model.", "doi": "10.1140/epjc/s10052-017-4718-8", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-03-20", "series_number": "3", "volume": "77", "issue": "3", "pages": "Art. No. 172" }, { "id": "authors:ay9dz-qjz98", "collection": "authors", "collection_id": "ay9dz-qjz98", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171002-092722120", "type": "article", "title": "Search for heavy neutrinos or third-generation leptoquarks in final states with two hadronically decaying \u03c4 leptons and two jets in proton-proton collisions at s\u221a = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new particles has been conducted using events with two high transverse momentum (p_T) \u03c4 leptons that decay hadronically, at least two high-p_T jets, and missing transverse energy from the \u03c4 lepton decays. The analysis is performed using data from proton-proton collisions, collected by the CMS experiment in 2015 at s\u221a = 13 TeV, corresponding to an integrated luminosity of 2.1 fb^(\u22121). The results are interpreted in two physics models. The first model involves heavy right-handed neutrinos, N_\u2113 (\u2113 = e, \u03bc, \u03c4), and right-handed charged bosons, W_R, arising in a left-right symmetric extension of the standard model. Masses of the W_R boson below 2.35 (1.63) TeV are excluded at 95% confidence level, assuming the N_\u03c4 mass is 0.8 (0.2) times the mass of the W_R boson and that only the N_\u03c4 flavor contributes to the W_R decay width. In the second model, pair production of third-generation scalar leptoquarks that decay into \u03c4\u03c4bb is considered. Third-generation scalar leptoquarks with masses below 740 GeV are excluded, assuming a 100% branching fraction for the leptoquark decay to a \u03c4 lepton and a bottom quark. This is the first search at hadron colliders for the third-generation Majorana neutrino, as well as the first search for third-generation leptoquarks in the final state with a pair of hadronically decaying \u03c4 leptons and jets.", "doi": "10.1007/JHEP03(2017)077", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-03-14", "series_number": "3", "volume": "2017", "issue": "3", "pages": "Art. No. 77" }, { "id": "authors:yqq31-8e868", "collection": "authors", "collection_id": "yqq31-8e868", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171002-121408609", "type": "article", "title": "Measurements of differential cross sections for associated production of a W boson and jets in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Differential cross sections for a W boson produced in association with jets are measured in a data sample of proton-proton collisions at a center-of-mass energy of 8 TeV recorded with the CMS detector and corresponding to an integrated luminosity of 19.6 fb^(\u22121). The W bosons are identified through their decay mode W \u2192 \u03bc\u03bd. The cross sections are reported as functions of jet multiplicity, transverse momenta, and the scalar sum of jet transverse momenta (H_T) for different jet multiplicities. Distributions of the angular correlations between the jets and the muon are examined, as well as the average number of jets as a function of H_T and as a function of angular variables. The measured differential cross sections are compared with tree-level and higher-order recent event generators, as well as next-to-leading-order and next-to-next-to-leading-order theoretical predictions. The agreement of the generators with the measurements builds confidence in their use for the simulation of W + jets background processes in searches for new physics at the LHC.", "doi": "10.1103/PhysRevD.95.052002", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2017-03-13", "series_number": "5", "volume": "95", "issue": "5", "pages": "Art. No. 052002" }, { "id": "authors:r4dbf-cw335", "collection": "authors", "collection_id": "r4dbf-cw335", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171002-141843031", "type": "article", "title": "Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for dark matter and unparticle production at the LHC has been performed using events containing two charged leptons (electrons or muons), consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector in 2015, corresponding to an integrated luminosity of 2.3 fb^(\u22121) of proton-proton collisions at the LHC, at a center-of-mass energy of 13 TeV. No excess over the standard model expectation is observed. Compared to previous searches in this topology, which exclusively relied on effective field theories, the results are interpreted in terms of a simplified model of dark matter production for both vector and axial vector couplings between a mediator and dark matter particles. The first study of this class of models using CMS data at \u221as = 13 TeV is presented. Additionally, effective field theories of dark matter and unparticle production are used to interpret the data.", "doi": "10.1007/JHEP03(2017)061", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-03", "series_number": "03", "volume": "2017", "issue": "03", "pages": "Art. No. 061" }, { "id": "authors:0qqfh-0dg27", "collection": "authors", "collection_id": "0qqfh-0dg27", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-080822184", "type": "article", "title": "Search for massive resonances decaying into WW, WZ or ZZ bosons in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Sirunyan", "given_name": "A. M.", "clpid": "Sirunyan-A-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for new massive resonances decaying to WW, WZ or ZZ bosons in \u2113\u03bdqq and qqqq final states. Results are based on data corresponding to an integrated luminosity of 2.3-2.7 fb^(\u22121) recorded in proton-proton collisions at \u221as=13 TeV with the CMS detector at the LHC. Decays of spin-1 and spin-2 resonances into two vector bosons are sought in the mass range 0.6-4.0 TeV. No significant excess over the standard model background is observed. Combining the results of the \u2113\u03bdqq and qqqq final states, cross section and mass exclusion limits are set for models that predict heavy spin-1 and spin-2 resonances. This is the first search for a narrow-width spin-2 resonance at \u221as=13 TeV.", "doi": "10.1007/JHEP03(2017)162", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-03", "series_number": "03", "volume": "2017", "issue": "03", "pages": "Art. No. 162" }, { "id": "authors:560e0-ba943", "collection": "authors", "collection_id": "560e0-ba943", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171002-084214285", "type": "article", "title": "Search for CP violation in tt production and decay in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The results of a first search for CP violation in the production and decay of top quark-antiquark (tt) pairs are presented. The search is based on asymmetries in T-odd, triple-product correlation observables, where T is the time-reversal operator. The analysis uses a sample of proton-proton collisions at \u221as=8 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7 fb^(\u22121). Events are selected having one electron or muon and at least four jets. The T-odd observables are measured using four-momentum vectors associated with tt production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.", "doi": "10.1007/JHEP03(2017)101", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-03", "series_number": "03", "volume": "2017", "issue": "03", "pages": "Art. No. 101" }, { "id": "authors:4wmhz-3q520", "collection": "authors", "collection_id": "4wmhz-3q520", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171003-115516935", "type": "article", "title": "Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Improved jet energy scale corrections, based on a data sample corresponding to an integrated luminosity of 19.7 fb^(-1) collected by the CMS experiment in proton-proton collisions at a center-of-mass energy of 8 TeV, are presented. The corrections as a function of pseudorapidity \u03b7 and transverse momentum p_T are extracted from data and simulated events combining several channels and methods. They account successively for the effects of pileup, uniformity of the detector response, and residual data-simulation jet energy scale differences. Further corrections, depending on the jet flavor and distance parameter (jet size) R, are also presented. The jet energy resolution is measured in data and simulated events and is studied as a function of pileup, jet size, and jet flavor. Typical jet energy resolutions at the central rapidities are 15\u201320% at 30 GeV, about 10% at 100 GeV, and 5% at 1 TeV. The studies exploit events with dijet topology, as well as photon+jet, Z+jet and multijet events. Several new techniques are used to account for the various sources of jet energy scale corrections, and a full set of uncertainties, and their correlations, are provided. The final uncertainties on the jet energy scale are below 3% across the phase space considered by most analyses (p_T > 30 GeV and 0|\u03b7| < 5.0). In the barrel region (|\u03b7| < 1.3) an uncertainty below 1% for p_T > 30 GeV is reached, when excluding the jet flavor uncertainties, which are provided separately for different jet flavors. A new benchmark for jet energy scale determination at hadron colliders is achieved with 0.32% uncertainty for jets with p_T of the order of 165\u2013330 GeV, and |\u03b7| < 0.8.", "doi": "10.1088/1748-0221/12/02/P02014", "issn": "1748-0221", "publisher": "International School of Advanced Studies", "publication": "Journal of Instrumentation", "publication_date": "2017-02-22", "series_number": "2", "volume": "12", "issue": "2", "pages": "Art. No. P02014" }, { "id": "authors:jj53f-sge82", "collection": "authors", "collection_id": "jj53f-sge82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171003-100830932", "type": "article", "title": "Measurement of the transverse momentum spectra of weak vector bosons produced in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The transverse momentum spectra of weak vector bosons are measured in the CMS experiment at the LHC. The measurement uses a sample of proton-proton collisions at \u221as = 8 TeV, collected during a special low-luminosity running that corresponds to an integrated luminosity of 18.4 \u00b1 0.5 pb^(-1). The production of W bosons is studied in both electron and muon decay modes, while the production of Z bosons is studied using only the dimuon decay channel. The ratios of W^- to W^+ and Z to W differential cross sections are also measured. The measured differential cross sections and ratios are compared with theoretical predictions up to next-to-next leading order in QCD.", "doi": "10.1007/JHEP02(2017)096", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-02-20", "series_number": "2", "volume": "2017", "issue": "2", "pages": "Art. No. 96" }, { "id": "authors:2gtrv-0tz83", "collection": "authors", "collection_id": "2gtrv-0tz83", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170407-095136488", "type": "article", "title": "Evidence for collectivity in pp collisions at the LHC", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of two- and multi-particle angular correlations in pp collisions at \u221as = 5,7, and 13 TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0pb^(-1) (5\u2009TeV), 6.2pg^(-1)(7\u2009TeV), and 0.7pb^(-1)(13\u2009TeV), were collected using the CMS detector at the LHC. The second-order (v_2) and third-order (v_3) azimuthal anisotropy harmonics of unidentified charged particles, as well as v_2 of K^0_S and \u039b/\u039b particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v_2 values of charged hadrons (mostly pions), K^0_S, and \u039b/\u039b, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below P_T \u2248 2GeV/c. For 13\u2009TeV data, the v_2 signals are also extracted from four- and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.", "doi": "10.1016/j.physletb.2016.12.009", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-02-10", "volume": "765", "pages": "193-220" }, { "id": "authors:x01w7-8yx67", "collection": "authors", "collection_id": "x01w7-8yx67", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170412-141631393", "type": "article", "title": "Search for top quark decays via Higgs-boson-mediated \n flavor-changing neutral currents in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for Higgs-boson-mediated flavor-changing neutral currents in the decays of top quarks. The search is based on proton-proton collision data corresponding to an integrated luminosity of 19.7 fb^(\u22121) at a center-of-mass energy of 8 TeV collected with the CMS detector at the LHC. Events in which a top quark pair is produced with one top quark decaying into a charm or up quark and a Higgs boson (H), and the other top quark decaying into a bottom quark and a W boson are selected. The Higgs boson in these events is assumed to subsequently decay into either dibosons or difermions. No significant excess is observed above the expected standard model background, and an upper limit at the 95% confidence level is set on the branching fraction \u212c(t\u2009\u2192\u2009Hc) of 0.40% and \u212c(t\u2009\u2192\u2009Hu) of 0.55%, where the expected upper limits are 0.43% and 0.40%, respectively. These results correspond to upper limits on the square of the flavor-changing Higgs boson Yukawa couplings |\u03bb_(tc)^H|^2\u2009<\u20096.9\u2009\u00d7\u200910^(\u22123) and |\u03bb_(tu)^H|^2\u2009<\u20099.8\u2009\u00d7\u200910^(\u22123).", "doi": "10.1007/JHEP02(2017)079", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-02", "series_number": "2", "volume": "2017", "issue": "2", "pages": "Art. No. 79" }, { "id": "authors:1nr9t-hkd59", "collection": "authors", "collection_id": "1nr9t-hkd59", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171003-081129323", "type": "article", "title": "Searches for invisible decays of the Higgs boson in pp collisions at \u221as = 7, 8, and 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Searches for invisible decays of the Higgs boson are presented. The data collected with the CMS detector at the LHC correspond to integrated luminosities of 5.1, 19.7, and 2.3 fb^(\u22121) at centre-of-mass energies of 7, 8, and 13 TeV, respectively. The search channels target Higgs boson production via gluon fusion, vector boson fusion, and in association with a vector boson. Upper limits are placed on the branching fraction of the Higgs boson decay to invisible particles, as a function of the assumed production cross sections. The combination of all channels, assuming standard model production, yields an observed (expected) upper limit on the invisible branching fraction of 0.24 (0.23) at the 95% confidence level. The results are also interpreted in the context of Higgs-portal dark matter models.", "doi": "10.1007/JHEP02(2017)135", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-02", "series_number": "02", "volume": "2017", "issue": "02", "pages": "Art. No. 135" }, { "id": "authors:n5120-8c049", "collection": "authors", "collection_id": "n5120-8c049", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170405-105331885", "type": "article", "title": "Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at s\u221a =7 and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 fb^(\u22121), respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique is used to discriminate between the signal and backgrounds, which are observed to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and right-handed tensor Wtb couplings are measured to be |f_V^R|\u2009<\u20090.16,\u2002|f_T^L|\u2009<\u20090.057, and \u2212\u20090.049\u2009<\u2009f_T^R\u2009<\u20090.048, respectively. For the FCNC couplings \u03ba_(tug) and \u03ba_(tcg), the 95% CL upper limits on coupling strengths are |\u03ba_(tug)|/\u039b\u2009<\u20094.1\u2009\u00d7\u200910^(\u2212\u20093) TeV^(\u22121) and |\u03ba_(tcg)|/\u039b\u2009<\u20091.8\u2009\u00d7\u200910^(\u22122) TeV^(\u22121), where \u039b is the scale for new physics, and correspond to upper limits on the branching fractions of 2.0 \u00d7 10^(\u22125) and 4.1 \u00d7 10^(\u22124) for the decays t \u2192 ug and t \u2192 cg, respectively.", "doi": "10.1007/JHEP02(2017)028", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-02", "series_number": "2", "volume": "2017", "issue": "2", "pages": "Art. No. 28" }, { "id": "authors:mkhv6-2dy65", "collection": "authors", "collection_id": "mkhv6-2dy65", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170329-082258629", "type": "article", "title": "Search for heavy resonances decaying to tau lepton pairs in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for heavy resonances that decay to tau lepton pairs is performed using proton-proton collisions at \u221as = 13TeV. The data were collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 2.2 fb^(\u22121). The observations are in agreement with standard model predictions. An upper limit at 95% confidence level on the product of the production cross section and branching fraction into tau lepton pairs is calculated as a function of the resonance mass. For the sequential standard model, the presence of Z\u2032 bosons decaying into tau lepton pairs is excluded for Z\u2032 masses below 2.1 TeV, extending previous limits for this final state. For the topcolor-assisted technicolor model, which predicts Z\u2032 bosons that preferentially couple to third-generation fermions, Z\u2032 masses below 1.7 TeV are excluded, representing the most stringent limit to date.", "doi": "10.1007/JHEP02(2017)048", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-02", "series_number": "2", "volume": "2017", "issue": "2", "pages": "Art. No. 48" }, { "id": "authors:5rpam-7tn76", "collection": "authors", "collection_id": "5rpam-7tn76", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170417-151620907", "type": "article", "title": "Search for high-mass Zy resonances in e^+e^- and \u00b5+\u00b5- y final states in proton-proton collisions at \u221as=8 and 13TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper describes the search for a high-mass narrow-width scalar particle decaying into a Z boson and a photon. The analysis is performed using proton-proton collision data recorded with the CMS detector at the LHC at center-of-mass energies of 8 and 13 TeV, corresponding to integrated luminosities of 19.7 and 2.7 fb^(\u22121), respectively. The Z bosons are reconstructed from opposite-sign electron or muon pairs. No statistically significant deviation from the standard model predictions has been found in the 200-2000 GeV mass range. Upper limits at 95% confidence level have been derived on the product of the scalar particle production cross section and the branching fraction of the Z decaying into electrons or muons, which range from 280 to 20 fb for resonance masses between 200 and 2000 GeV.", "doi": "10.1007/JHEP01(2017)076", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2017-02", "series_number": "1", "volume": "2017", "issue": "1", "pages": "Art. No. 076" }, { "id": "authors:kmzsb-24113", "collection": "authors", "collection_id": "kmzsb-24113", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170404-072530276", "type": "article", "title": "Measurement of the production cross section of a W boson\n in association with two b jets in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The production cross section of a W boson in association with two b jets is measured using a sample of proton\u2013proton collisions at \u221as = 8TeV collected by the CMS experiment at the CERN LHC. The data sample corresponds to an integrated luminosity of 19.8 fb^(-1). The W bosons are reconstructed via their leptonic decays, W \u2192 \u2113\u03bd, where \u2113 = \u03bc or ee . The fiducial region studied contains exactly one lepton with transverse momentum p^\u2113_T > 30 GeV and pseudorapidity |\u03b7^\u2113|<2.1, with exactly two b jets with p_T > 25 GeV and |\u03b7|< 2.4 and no other jets with p_T > 25 GeV and |\u03b7|<4.7. The cross section is measured to be \u03c3(pp \u2192 W (\u2113\u03bd) + bb) = 0.64 \u00b1 0.03(stat) \u00b1 0.10(syst) \u00b1 0.06 (theo) \u00b1 0.02 (lumi) pb), in agreement with standard model predictions.", "doi": "10.1140/epjc/s10052-016-4573-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-02", "series_number": "2", "volume": "77", "issue": "2", "pages": "Art. No. 92" }, { "id": "authors:srmm0-s9280", "collection": "authors", "collection_id": "srmm0-s9280", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170227-125247177", "type": "article", "title": "Search for Dark Matter and Supersymmetry with a Compressed Mass Spectrum in the Vector Boson Fusion Topology in Proton-Proton Collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A first search for pair production of dark matter candidates through vector boson fusion in proton-proton collisions at \u221as = 8\u2009\u2009TeV is performed with the CMS detector. The vector boson fusion topology enhances missing transverse momentum, providing a way to probe supersymmetry, even in the case of a compressed mass spectrum. The data sample corresponds to an integrated luminosity of 18.5\u2009\u2009fb^(\u22121), recorded by the CMS experiment. The observed dijet mass spectrum is consistent with the standard model expectation. In an effective field theory, dark matter masses are explored as a function of contact interaction strength. The most stringent limit on bottom squark production with mass below 315 GeV is also reported, assuming a 5 GeV mass difference with respect to the lightest neutralino.", "doi": "10.1103/PhysRevLett.118.021802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2017-01-12", "series_number": "2", "volume": "118", "issue": "2", "pages": "Art. No. 021802" }, { "id": "authors:hqde9-tf608", "collection": "authors", "collection_id": "hqde9-tf608", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170403-121803251", "type": "article", "title": "Observation of the decay B^+ \u2192 \u03c8(2S)\u03d5(1020)K^+ in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The decay B^+ \u2192 \u03c8 (2S) \u03d5(1020)K^+B^+ \u2192 \u03c8(2S)\u03d5(1020)K^+ is observed for the first time using data collected from pp collisions at \u221as = 8 TeV by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19.6 fb^(-1). The branching fraction of this decay is measured, using the mode B+\u2192\u03c8(2S)K+B+\u2192\u03c8(2S)K+ as normalization, to be (4.0\u00b10.4(stat) \u00b1 0.6(syst)\u00b10.2(B))\u00d710^(\u22126), where the third uncertainty is from the measured branching fraction of the normalization channel.", "doi": "10.1016/j.physletb.2016.11.001", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2017-01-10", "volume": "764", "pages": "66-86" }, { "id": "authors:cbsmb-13n52", "collection": "authors", "collection_id": "cbsmb-13n52", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171006-084323261", "type": "article", "title": "Search for supersymmetry in events with one lepton and multiple jets in proton-proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for supersymmetry is performed in events with a single electron or muon in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 2.3 fb^(\u22121). Several exclusive search regions are defined based on the number of jets and \nb-tagged jets, the scalar sum of the jet transverse momenta, and the scalar sum of the missing transverse momentum and the transverse momentum of the lepton. The observed event yields in data are consistent with the expected backgrounds from standard model processes. The results are interpreted using two simplified models of supersymmetric particle spectra, both of which describe gluino pair production. In the first model, each gluino decays via a three-body process to top quarks and a neutralino, which is associated with the observed missing transverse momentum in the event. Gluinos with masses up to 1.6 TeV are excluded for neutralino masses below 600 GeV. In the second model, each gluino decays via a three-body process to two light quarks and a chargino, which subsequently decays to a W boson and a neutralino. The mass of the chargino is taken to be midway between the gluino and neutralino masses. In this model, gluinos with masses below 1.4 TeV are excluded for neutralino masses below 700 GeV.", "doi": "10.1103/PhysRevD.95.012011", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2017-01-01", "series_number": "1", "volume": "95", "issue": "1", "pages": "Art. No. 012011" }, { "id": "authors:mx77v-p1h12", "collection": "authors", "collection_id": "mx77v-p1h12", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170227-155159977", "type": "article", "title": "Inclusive search for supersymmetry using razor variables in pp collisions at \u221as = 13\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "An inclusive search for supersymmetry using razor variables is performed in events with four or more jets and no more than one lepton. The results are based on a sample of proton-proton collisions corresponding to an integrated luminosity of 2.3\u2009\u2009fb^(\u22121) collected with the CMS experiment at a center-of-mass energy of \u221as = 13\u2009\u2009TeV. No significant excess over the background prediction is observed in data, and 95% confidence level exclusion limits are placed on the masses of new heavy particles in a variety of simplified models. Assuming that pair-produced gluinos decay only via three-body processes involving third-generation quarks plus a neutralino, and that the neutralino is the lightest supersymmetric particle with a mass of 200 GeV, gluino masses below 1.6 TeV are excluded for any branching fractions for the individual gluino decay modes. For some specific decay mode scenarios, gluino masses up to 1.65 TeV are excluded. For decays to first- and second-generation quarks and a neutralino with a mass of 200 GeV, gluinos with masses up to 1.4 TeV are excluded. Pair production of top squarks decaying to a top quark and a neutralino with a mass of 100 GeV is excluded for top squark masses up to 750 GeV.", "doi": "10.1103/PhysRevD.95.012003", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2017-01-01", "series_number": "1", "volume": "95", "issue": "1", "pages": "Art. No. 012003" }, { "id": "authors:vgnkn-tnz16", "collection": "authors", "collection_id": "vgnkn-tnz16", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171005-104934018", "type": "article", "title": "Search for R-parity violating supersymmetry with displaced vertices in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported from a search for R-parity violating supersymmetry in proton-proton collision events collected by the CMS experiment at a center-of-mass energy of \u221as = 8\u2009TeV. The data sample corresponds to an integrated luminosity of 17.6fb^(\u22121). This search assumes a minimal flavor violating model in which the lightest supersymmetric particle is a long-lived neutralino or gluino, leading to a signal with jets emanating from displaced vertices. In a sample of events with two displaced vertices, no excess yield above the expectation from standard model processes is observed, and limits are placed on the pair production cross section as a function of mass and lifetime of the neutralino or gluino. At 95% confidence level, the analysis excludes cross sections above approximately 1 fb for neutralinos or gluinos with mass between 400 and 1500 GeV and mean proper decay length between 1 and 30 mm. Gluino masses are excluded below 1 and 1.3 TeV for mean proper decay lengths of 300 \u03bcm and 1 mm, respectively, and below 1.4 TeV for the range 2\u201330 mm. The results are also applicable to other models in which long-lived particles decay into multijet final states.", "doi": "10.1103/PhysRevD.95.012009", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2017-01-01", "series_number": "1", "volume": "95", "issue": "1", "pages": "Art. No. 012009" }, { "id": "authors:4d025-ky785", "collection": "authors", "collection_id": "4d025-ky785", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170410-145055748", "type": "article", "title": "The CMS trigger system", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper describes the CMS trigger system and its performance during Run 1 of the LHC. The trigger system consists of two levels designed to select events of potential physics interest from a GHz (MHz) interaction rate of proton-proton (heavy ion) collisions. The first level of the trigger is implemented in hardware, and selects events containing detector signals consistent with an electron, photon, muon, \u03c4 lepton, jet, or missing transverse energy. A programmable menu of up to 128 object-based algorithms is used to select events for subsequent processing. The trigger thresholds are adjusted to the LHC instantaneous luminosity during data taking in order to restrict the output rate to 100 kHz, the upper limit imposed by the CMS readout electronics. The second level, implemented in software, further refines the purity of the output stream, selecting an average rate of 400 Hz for offline event storage. The objectives, strategy and performance of the trigger system during the LHC Run 1 are described.", "doi": "10.1088/1748-0221/12/01/P01020", "issn": "1748-0221", "publisher": "IOP Publishing", "publication": "Journal of Instrumentation", "publication_date": "2017-01", "series_number": "1", "volume": "12", "issue": "1", "pages": "Art. No. P01020" }, { "id": "authors:9601e-wnx11", "collection": "authors", "collection_id": "9601e-wnx11", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170321-083810719", "type": "article", "title": "Measurements of the tt[bar] production cross section in lepton+jets final states in pp collisions at 8 TeV and ratio of 8 to 7 TeV cross sections", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the top quark pair production (tt[bar]) cross section in proton\u2013proton collisions at the centre-of-mass energy of 8TeV is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6fb^(\u22121). This analysis is performed in the tt[bar] decay channels with one isolated, high transverse momentum electron or muon and at least four jets, at least one of which is required to be identified as originating from hadronization of a b quark. The calibration of the jet energy scale and the efficiency of b jet identification are determined from data. The measured tt[bar] cross section is 228.5\u00b13.8(stat)\u00b113.7(syst)\u00b16.0(lumi) pb. This measurement is compared with an analysis of 7TeV data, corresponding to an integrated luminosity of 5.0fb^(\u22121), to determine the ratio of 8TeV to 7TeV cross sections, which is found to be 1.43\u00b10.04(stat)\u00b10.07(syst)\u00b10.05(lumi). The measurements are in agreement with QCD predictions up to next-to-next-to-leading order.", "doi": "10.1140/epjc/s10052-016-4504-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2017-01", "volume": "77", "pages": "Art. No. 15" }, { "id": "authors:5p480-58m13", "collection": "authors", "collection_id": "5p480-58m13", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170324-100746925", "type": "article", "title": "Measurement of the ZZ production cross section and Z \u2192 \u2113^+\u2113^-\u2113'+\u2113'^- branching fraction in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Four-lepton production in proton\u2013proton collisions, pp\u2192(Z/\u03b3^*)(Z/\u03b3^*)\u2192\u2113^+\u2113^\u2212\u2113^(\u2032+)\u2113^(\u2032\u2212), where \u2113,\u2113\u2032=e or \u03bc, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.6 fb^(\u22121). The ZZ production cross section, \u03c3(pp \u2192 ZZ = 14.6^(+1.9)_(-1.8) (stat)^(+0.5)_(-0.3) (syst) \u00b1 0.2(theo)\u00b1 0.4(lumi)pb, is measured for events with two opposite-sign, same-flavor lepton pairs produced in the mass region 604 GeV for all opposite-sign, same-flavor lepton pairs. The results are in agreement with standard model predictions.", "doi": "10.1016/j.physletb.2016.10.054", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-12-10", "volume": "763", "pages": "280-303" }, { "id": "authors:hkame-bk866", "collection": "authors", "collection_id": "hkame-bk866", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170324-115947319", "type": "article", "title": "Search for lepton flavour violating decays of the Higgs boson to e\u03c4 and e\u03bc in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A direct search for lepton flavour violating decays of the Higgs boson (H) in the H\u2192e\u03c4 and H\u2192e\u03bc channels is described. The data sample used in the search was collected in proton\u2013proton collisions at \u221as = 8 TeV with the CMS detector at the LHC and corresponds to an integrated luminosity of 19.7 fb^(\u22121). No evidence is found for lepton flavour violating decays in either final state. Upper limits on the branching fractions, B(H\u2192e\u03c4)<0.69% and B(H\u2192e\u03bc)<0.035%, are set at the 95% confidence level. The constraint set on B(H\u2192e\u03c4) is an order of magnitude more stringent than the existing indirect limits. The limits are used to constrain the corresponding flavour violating Yukawa couplings, absent in the standard model.", "doi": "10.1016/j.physletb.2016.09.062", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-12-10", "volume": "763", "pages": "472-500" }, { "id": "authors:sm4jg-95t13", "collection": "authors", "collection_id": "sm4jg-95t13", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161213-090300079", "type": "article", "title": "Studies of inclusive four-jet production with two b-tagged jets in proton-proton collisions at 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements are presented of the cross section for the production of at least four jets, of which at least two originate from b quarks, in proton-proton collisions. Data collected with the CMS detector at the LHC at a center-of-mass energy of 7 TeV are used, corresponding to an integrated luminosity of 3\u2009\u2009pb^(\u22121). The cross section is measured as a function of the jet transverse momentum for p_T > 20\u2009\u2009GeV, and of the jet pseudorapidity for |\u03b7| < 2.4 (b jets), 4.7 (untagged jets). The correlations in azimuthal angle and pT between the jets are also studied. The inclusive cross section is measured to be \u03c3(pp \u2192 2b + 2j + X) = 69 \u00b1 3(stat) \u00b1 24(syst)\u2009\u2009nb. The \u03b7 and p_T distributions of the four jets and the correlations between them are well reproduced by event generators that combine perturbative QCD calculations at next-to-leading-order accuracy with contributions from parton showers and multiparton interactions.", "doi": "10.1103/PhysRevD.94.112005", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-12-01", "series_number": "11", "volume": "94", "issue": "11", "pages": "Art. No. 112005" }, { "id": "authors:2v2sn-m5z97", "collection": "authors", "collection_id": "2v2sn-m5z97", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170224-113603540", "type": "article", "title": "Searches for R-parity-violating supersymmetry in pp collisions at \u221as = 8 TeV in final states with 0\u20134 leptons", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from searches for R-parity-violating supersymmetry in events produced in pp collisions at \u221as = 8 TeV at the LHC. Final states with 0, 1, 2, or multiple leptons are considered independently. The analysis is performed on data collected by the CMS experiment corresponding to an integrated luminosity of 19.5 fb^(\u22121). No excesses of events above the standard model expectations are observed, and 95% confidence level limits are set on supersymmetric particle masses and production cross sections. The results are interpreted in models featuring R-parity-violating decays of the lightest supersymmetric particle, which in the studied scenarios can be either the gluino, a bottom squark, or a neutralino. In a gluino pair production model with baryon number violation, gluinos with a mass less than 0.98 and 1.03 TeV are excluded, by analyses in a fully hadronic and one-lepton final state, respectively. An analysis in a dilepton final state is used to exclude bottom squarks with masses less than 307 GeV in a model considering bottom squark pair production. Multilepton final states are considered in the context of either strong or electroweak production of superpartners and are used to set limits on the masses of the lightest supersymmetric particles. These limits range from 300 to 900 GeV in models with leptonic and up to approximately 700 GeV in models with semileptonic R-parity-violating couplings.", "doi": "10.1103/PhysRevD.94.112009", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-12-01", "series_number": "11", "volume": "94", "issue": "11", "pages": "Art. No. 112009" }, { "id": "authors:22dxn-wjj61", "collection": "authors", "collection_id": "22dxn-wjj61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161213-092137560", "type": "article", "title": "Search for long-lived charged particles in proton-proton collisions at \u221as = 13\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented of a search for heavy stable charged particles produced in proton-proton collisions at \u221as =13\u2009TeV using a data sample corresponding to an integrated luminosity of 2.5\u2009\u2009fb^(-1) collected in 2015 with the CMS detector at the CERN LHC. The search is conducted using signatures of anomalously high energy deposits in the silicon tracker and long time-of-flight measurements by the muon system. The data are consistent with the expected background, and upper limits are set on the cross sections for production of long-lived gluinos, top squarks, tau sleptons, and leptonlike long-lived fermions. These upper limits are equivalently expressed as lower limits on the masses of new states; the limits for gluinos, ranging up to 1610 GeV, are the most stringent to date. Limits on the cross sections for direct pair production of long-lived tau sleptons are also determined.", "doi": "10.1103/PhysRevD.94.112004", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-12-01", "series_number": "11", "volume": "94", "issue": "11", "pages": "Art. No. 112004" }, { "id": "authors:khv3b-2mt41", "collection": "authors", "collection_id": "khv3b-2mt41", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171010-084203263", "type": "article", "title": "Search for dark matter in proton-proton collisions at 8 TeV with missing transverse momentum and vector boson tagged jets", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for an excess of events with large missing transverse momentum in association with at least one highly energetic jet, in a data sample of proton-proton collisions at a centre-of-mass energy of 8 TeV. The data correspond to an integrated luminosity of 19.7 fb^(\u22121) collected by the CMS experiment at the LHC. The results are interpreted using a set of simplified models for the production of dark matter via a scalar, pseudoscalar, vector, or axial vector mediator. Additional sensitivity is achieved by tagging events consistent with the jets originating from a hadronically decaying vector boson. This search uses jet substructure techniques to identify hadronically decaying vector bosons in both Lorentz-boosted and resolved scenarios. This analysis yields improvements of 80% in terms of excluded signal cross sections with respect to the previous CMS analysis using the same data set. No significant excess with respect to the standard model expectation is observed and limits are placed on the parameter space of the simplified models. Mediator masses between 80 and 400 GeV in the scalar and pseudoscalar models, and up to 1.5 TeV in the vector and axial vector models, are excluded.", "doi": "10.1007/JHEP12(2016)083", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-12", "series_number": "12", "volume": "2016", "issue": "12", "pages": "Art. No. 083" }, { "id": "authors:e6m37-87x04", "collection": "authors", "collection_id": "e6m37-87x04", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171025-105256525", "type": "article", "title": "Measurement of the mass of the top quark in decays with a J/\u03c8 meson in pp collisions at 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A first measurement of the top quark mass in the decay channel t \u2192 (W \u2192 \u2113\u03bd)(b \u2192 J/\u03c8 + X \u2192 \u03bc^+ \u03bc^\u2212 + X) is presented. The analysis uses events selected from the proton-proton collisions recorded by the CMS detector at the LHC at a center-of-mass energy of 8 TeV. The data correspond to an integrated luminosity of 19.7 fb^(\u22121), with 666 t t-bar and single top quark candidate events containing a reconstructed J/\u03c8 candidate decaying into an oppositely-charged muon pair. The mass of the (J/\u03c8 + \u2113) system, where \u2113 is an electron or a muon from W boson decay, is used to extract a top quark mass of 173.5 \u00b1 3.0 (stat) \u00b1 0.9 (syst) GeV.", "doi": "10.1007/JHEP12(2016)123", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-12", "series_number": "12", "volume": "2016", "issue": "12", "pages": "Art No. 123" }, { "id": "authors:qm0bd-n9547", "collection": "authors", "collection_id": "qm0bd-n9547", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170227-095446775", "type": "article", "title": "Search for new physics in final states with two opposite-sign, same-flavor leptons, jets, and missing transverse momentum in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for physics beyond the standard model in final states with two opposite-sign, same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 2.3 fb^(\u22121) of proton-proton collisions at \u221as=13 TeV collected with the CMS detector at the LHC in 2015. The analysis uses the invariant mass of the lepton pair, searching for a kinematic edge or a resonant-like excess compatible with the Z boson mass. Both search modes use several event categories in order to increase the sensitivity to new physics. These categories are based on the rapidity of the leptons, the multiplicity of jets and b jets, the scalar sum of jet transverse momenta, and missing transverse momentum. The observations in all signal regions are consistent with the expectations from the standard model, and the results are interpreted in the context of simplified models of supersymmetry.", "doi": "10.1007/JHEP12(2016)013", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-12", "series_number": "12", "volume": "2016", "issue": "12", "pages": "Art. No. 13" }, { "id": "authors:v0ew3-v6p80", "collection": "authors", "collection_id": "v0ew3-v6p80", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170313-080202418", "type": "article", "title": "Search for dark matter particles in proton-proton collisions at \u221as = 8 TeV using the razor variables", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for dark matter particles directly produced in proton-proton collisions recorded by the CMS experiment at the LHC is presented. The data correspond to an integrated luminosity of 18.8 fb^(\u22121), at a center-of-mass energy of 8 TeV. The event selection requires at least two jets and no isolated leptons. The razor variables are used to quantify the transverse momentum balance in the jet momenta. The study is performed separately for events with and without jets originating from b quarks. The observed yields are consistent with the expected backgrounds and, depending on the nature of the production mechanism, dark matter production at the LHC is excluded at 90% confidence level for a mediator mass scale \u039b below 1 TeV. The use of razor variables yields results that complement those previously published.", "doi": "10.1007/JHEP12(2016)088", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-12", "volume": "2088", "pages": "Art. No 88." }, { "id": "authors:7ykcn-4tn34", "collection": "authors", "collection_id": "7ykcn-4tn34", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170324-150057809", "type": "article", "title": "Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton+jets final states produced in pp collisions at \u221as=8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The W boson helicity fractions from top quark decays in tt events are measured using data from proton\u2013proton collisions at a centre-of-mass energy of 8TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8fb^(-1). Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F_0 = 0.681 \u00b1 0.012(stat) \u00b1 0.023 (syst), f_L and F_R = -0.004 \u00b1 0.005(stat) \u00b1 0.014(syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.", "doi": "10.1016/j.physletb.2016.10.007", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-11-10", "volume": "762", "pages": "512-534" }, { "id": "authors:whz24-f3x04", "collection": "authors", "collection_id": "whz24-f3x04", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161212-130253685", "type": "article", "title": "Decomposing transverse momentum balance contributions for quenched jets in PbPb collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Interactions between jets and the quark-gluon plasma produced in heavy ion collisions are studied via the angular distributions of summed charged-particle transverse momenta (p_T) with respect to both the leading and subleading jet axes in high-p_T dijet events. The contributions of charged particles in different momentum ranges to the overall event p_T balance are decomposed into short-range jet peaks and a long-range azimuthal asymmetry in charged-particle p_T. The results for PbPb collisions are compared to those in pp collisions using data collected in 2011 and 2013, at collision energy \u221asNN = 2.76 TeV with integrated luminosities of 166 \u03bcb^(\u22121) and 5.3 pb^(\u22121), respectively, by the CMS experiment at the LHC. Measurements are presented as functions of PbPb collision centrality, charged-particle p_T, relative azimuth, and radial distance from the jet axis for balanced and unbalanced dijets.", "doi": "10.1007/JHEP11(2016)055", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-11", "series_number": "11", "volume": "2016", "issue": "11", "pages": "Art. No. 055" }, { "id": "authors:h8q6a-w3560", "collection": "authors", "collection_id": "h8q6a-w3560", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171006-084336179", "type": "article", "title": "Measurement of electroweak production of a W boson and two forward jets in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the cross section for the electroweak production of a W boson in association with two jets in proton-proton collisions at a center-of-mass energy of 8 TeV. The data set was collected with the CMS detector and corresponds to an integrated luminosity of 19.3 fb^(\u22121). The measured fiducial cross section for W bosons decaying to electrons or muons and for pT^(j1)> 60 GeV, p^(Tj2)> 50 GeV, |\u03b7^j| < 4.7, and m_(jj)> 1000 GeV is 0.42 \u00b1 0.04 (stat) \u00b1 0.09 (syst) \u00b1 0.01 (lumi) pb. This result is consistent with the standard model leading-order prediction of 0.50 \u00b1 0.02 (scale) \u00b1 0.02 (PDF) pb obtained with MADGRAPH5_aMC@NLO 2.1 interfaced to PYTHIA 6.4. This is the first cross section measurement for this process.", "doi": "10.1007/JHEP11(2016)147", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-11", "series_number": "11", "volume": "2016", "issue": "11", "pages": "Art. No. 147" }, { "id": "authors:6hb6f-fns98", "collection": "authors", "collection_id": "6hb6f-fns98", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170117-105156503", "type": "article", "title": "Measurement of the integrated and differential tt production cross sections for high-pT top quarks in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The cross section for pair production of top quarks (tt) with high transverse momenta is measured in pp collisions, collected with the CMS detector at the LHC with \u221as = 8 TeV in data corresponding to an integrated luminosity of 19.7 fb^(\u22121). The measurement is performed using lepton + jets events, where one top quark decays semileptonically, while the second top quark decays to a hadronic final state. The hadronic decay is reconstructed as a single, large-radius jet, and identified as a top quark candidate using jet substructure techniques. The integrated cross section and the differential cross sections as a function of top quark p_T and rapidity are measured at particle level within a fiducial region related to the detector-level requirements and at parton level. The particle-level integrated cross section is found to be \u03c3_(tt) = 0.499 \u00b1 0.035(stat + syst) \u00b1 0.095(theo) \u00b1 0.013(lumi) pb for top quark p_T > 400 GeV. The parton-level measurement is \u03c3_(tt) = 1.44 \u00b1 0.10(stat \u00b1 syst) \u00b1 0.29(theo) \u00b1 0.04(lumi) pb. The integrated and differential cross section results are compared to predictions from several event generators.", "doi": "10.1103/PhysRevD.94.072002", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-10-12", "series_number": "7", "volume": "94", "issue": "7", "pages": "Art. No. 072002" }, { "id": "authors:a4px6-gna81", "collection": "authors", "collection_id": "a4px6-gna81", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170221-093416517", "type": "article", "title": "\u03d2(nS) polarizations versus particle multiplicity in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The polarizations of the \u03d2(1S), \u03d2(2S), and \u03d2(3S) mesons are measured as a function of the charged particle multiplicity in proton\u2013proton collisions at \u221as = 7 TeV. The measurements are performed with a dimuon data sample collected in 2011 by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb^(\u22121). The results are extracted from the dimuon decay angular distributions, in two ranges of \u03d2(nS) transverse momentum (10\u201315 and 15\u201335 GeV), and in the rapidity interval |y|<1.2. The results do not show significant changes from low- to high-multiplicity pp collisions, although large uncertainties preclude definite statements in the \u03d2(2S) and \u03d2(3S) cases.", "doi": "10.1016/j.physletb.2016.07.065", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-10-10", "volume": "761", "pages": "31-52" }, { "id": "authors:p2jkb-0y143", "collection": "authors", "collection_id": "p2jkb-0y143", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170227-085407600", "type": "article", "title": "Measurement of dijet azimuthal decorrelation in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the decorrelation of azimuthal angles between the two jets with the largest transverse momenta is presented for seven regions of leading jet transverse momentum up to 2.2 TeV. The analysis is based on the proton-proton collision data collected with the CMS experiment at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7fb^(\u22121). The dijet azimuthal decorrelation is caused by the radiation of additional jets and probes the dynamics of multijet production. The results are compared to fixed-order predictions of perturbative quantum chromodynamics (QCD), and to simulations using Monte Carlo event generators that include parton showers, hadronization, and multiparton interactions. Event generators with only two outgoing high transverse momentum partons fail to describe the measurement, even when supplemented with next-to-leading-order QCD corrections and parton showers. Much better agreement is achieved when at least three outgoing partons are complemented through either next-to-leading-order predictions or parton showers. This observation emphasizes the need to improve predictions for multijet production.", "doi": "10.1140/epjc/s10052-016-4346-8", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-10", "series_number": "10", "volume": "76", "issue": "10", "pages": "Art. No. 536" }, { "id": "authors:hjds2-pmf68", "collection": "authors", "collection_id": "hjds2-pmf68", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161121-110843879", "type": "article", "title": "Search for new physics with the M_(T2) variable in all-jets final states produced in pp collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics is performed using events that contain one or more jets, no isolated leptons, and a large transverse momentum imbalance, as measured through the M_(T2) variable, which is an extension of the transverse mass in events with two invisible particles. The results are based on a sample of proton-proton collisions collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, and that corresponds to an integrated luminosity of 2.3 fb^(\u22121). The observed event yields in the data are consistent with predictions for the standard model backgrounds. The results are interpreted using simplified models of supersymmetry and are expressed in terms of limits on the masses of potential new colored particles. Assuming that the lightest neutralino is stable and has a mass less than about 500 GeV, gluino masses up to 1550-1750 GeV are excluded at 95% confidence level, depending on the gluino decay mechanism. For the scenario of direct production of squark-antisquark pairs, top squarks with masses up to 800 GeV are excluded, assuming a 100% branching fraction for the decay to a top quark and neutralino. Similarly, bottom squark masses are excluded up to 880 GeV, and masses of light-flavor squarks are excluded up to 600-1260 GeV, depending on the degree of degeneracy of the squark masses.", "doi": "10.1007/JHEP10(2016)006", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-10", "series_number": "10", "volume": "2016", "issue": "10", "pages": "Art. No. 006" }, { "id": "authors:22cca-jve50", "collection": "authors", "collection_id": "22cca-jve50", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161207-130745862", "type": "article", "title": "Phenomenological MSSM interpretation of CMS searches in pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Searches for new physics by the CMS collaboration are interpreted in the framework of the phenomenological minimal supersymmetric standard model (pMSSM). The data samples used in this study were collected at \u221as = 7 and 8 TeV and have integrated luminosities of 5.0 fb^(-1) and 19.5 fb^(-1), respectively. A global Bayesian analysis is performed, incorporating results from a broad range of CMS supersymmetry searches, as well as constraints from other experiments. Because the pMSSM incorporates several well-motivated assumptions that reduce the 120 parameters of the MSSM to just 19 parameters defined at the electroweak scale, it is possible to assess the results of the study in a relatively straightforward way. Approximately half of the model points in a potentially accessible subspace of the pMSSM are excluded, including all pMSSM model points with a gluino mass below 500 GeV, as well as models with a squark mass less than 300 GeV. Models with chargino and neutralino masses below 200 GeV are disfavored, but no mass range of model points can be ruled out based on the analyses considered. The nonexcluded regions in the pMSSM parameter space are characterized in terms of physical processes and key observables, and implications for future searches are discussed.", "doi": "10.1007/JHEP10(2016)129", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-10", "series_number": "10", "volume": "2016", "issue": "10", "pages": "Art. No. 129" }, { "id": "authors:tpe6s-jcr38", "collection": "authors", "collection_id": "tpe6s-jcr38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161010-085423988", "type": "article", "title": "Measurements of tt source tt charge asymmetry using dilepton final states in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The charge asymmetry in tt events is measured using dilepton final states produced in pp collisions at the LHC at \u221as = 8 TeV. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of View the MathML source19.5fb^(\u22121). The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The tt and leptonic inclusive charge asymmetries are found to be 0.011\u00b10.011(stat)\u00b10.007(syst) and 0.003\u00b10.006(stat)\u00b10.003(syst), respectively. These results, as well as charge asymmetry measurements made as a function of the invariant mass, rapidity, and transverse momentum of the tt system, are in agreement with predictions of the standard model.", "doi": "10.1016/j.physletb.2016.07.006", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-09-10", "volume": "760", "pages": "365-386" }, { "id": "authors:2x21r-w5d27", "collection": "authors", "collection_id": "2x21r-w5d27", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161010-110100005", "type": "article", "title": "Measurement of the Z\u03b3 \u2192 \u03bd\u03bd\u03b3 production cross section in pp collisions at \u221as = 8\u2009TeV and limits on anomalous ZZ\u03b3 and Z\u03b3\u03b3 trilinear gauge boson couplings", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "An inclusive measurement of the Z\u03b3 \u2192 \u03bd\u03bd\u03b3 production cross section in pp collisions at \u221as = 8\u2009TeV is presented, using data corresponding to an integrated luminosity of 19.6\u2009fb^(\u22121) collected with the CMS detector at the LHC. This measurement is based on the observation of events with large missing energy and with a single photon with transverse momentum above 145 GeV and absolute pseudorapidity in the range |\u03b7|<1.44. The measured Z\u03b3 \u2192 \u03bd\u03bd\u03b3 production cross section, 52.7\u00b12.1\u2009(stat)\u00b16.4\u2009(syst)\u00b11.4\u2009(lumi)\u2009fb, agrees well with the standard model prediction of 50.0_(\u22122.2)^(+2.4)\u2009fb. A study of the photon transverse momentum spectrum yields the most stringent limits to date on the anomalous ZZ\u03b3 and Z\u03b3\u03b3 trilinear gauge boson couplings.", "doi": "10.1016/j.physletb.2016.06.080", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-09-10", "volume": "760", "pages": "448-468" }, { "id": "authors:3zpcf-nse61", "collection": "authors", "collection_id": "3zpcf-nse61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161007-082425187", "type": "article", "title": "Search for R-parity violating decays of a top squark in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The results of a search for a supersymmetric partner of the top quark (top squark), pair-produced in proton\u2013proton collisions at \u221as = 8 TeV, are presented. The search, which focuses on R-parity violating, chargino-mediated decays of the top squark, is performed in final states with low missing transverse momentum, two oppositely charged electrons or muons, and at least five jets. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb^(\u22121) collected with the CMS detector at the LHC in 2012. The data are found to be in agreement with the standard model expectation, and upper limits are placed on the top squark pair production cross section at 95% confidence level. Assuming a 100% branching fraction for the top squark decay chain, t \u2192 t\u03c7_1^\u00b1,\u03c7_1^\u00b1 \u2192 \u2113^\u00b1 + jj, top squark masses less than 890 (1000) GeV for the electron (muon) channel are excluded for the first time in models with a single nonzero R-parity violating coupling \u03bb_(ijk)\u2032(i,j,k\u22642)(i,j,k\u22642), where i,j,ki,j,k correspond to the three generations.", "doi": "10.1016/j.physletb.2016.06.039", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-09-10", "volume": "760", "pages": "178-201" }, { "id": "authors:tm2ww-kzj96", "collection": "authors", "collection_id": "tm2ww-kzj96", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161129-093752927", "type": "article", "title": "Search for two Higgs bosons in final states containing two photons and two bottom quarks in proton-proton collisions at 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for the production of two Higgs bosons in final states containing two photons and two bottom quarks. Both resonant and nonresonant hypotheses are investigated. The analyzed data correspond to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121) of proton-proton collisions at \u221as = 8\u2009\u2009TeV collected with the CMS detector. Good agreement is observed between data and predictions of the standard model (SM). Upper limits are set at 95% confidence level on the production cross section of new particles and compared to the prediction for the existence of a warped extra dimension. When the decay to two Higgs bosons is kinematically allowed, assuming a mass scale \u039b_R = 1\u2009\u2009TeV for the model, the data exclude a radion scalar at masses below 980 GeV. The first Kaluza-Klein excitation mode of the graviton in the RS1 Randall-Sundrum model is excluded for masses between 325 and 450 GeV. An upper limit of 0.71 pb is set on the nonresonant two-Higgs-boson cross section in the SM-like hypothesis. Limits are also derived on nonresonant production assuming anomalous Higgs-boson couplings.", "doi": "10.1103/PhysRevD.94.052012", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-09-01", "series_number": "5", "volume": "94", "issue": "5", "pages": "Art. No. 052012" }, { "id": "authors:df1ta-7wq79", "collection": "authors", "collection_id": "df1ta-7wq79", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161012-093540372", "type": "article", "title": "Search for s channel single top quark production in pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for single top quark production in the s channel in proton-proton collisions with the CMS detector at the CERN LHC in decay modes of the top quark containing a muon or an electron in the final state. The signal is extracted through a maximum-likelihood fit to the distribution of a multivariate discriminant defined using boosted decision trees to separate the expected signal contribution from background processes. The analysis uses data collected at centre-of-mass energies of 7 and 8 TeV and corresponding to integrated luminosities of 5.1 and 19.7 fb^(\u22121), respectively. The measured cross sections of 7.1 \u00b1 8.1 pb (at 7 TeV) and 13.4 \u00b1 7.3 pb (at 8 TeV) result in a best fit value of 2.0 \u00b1 0.9 for the combined ratio of the measured and expected values. The signal significance is 2.5 standard deviations, and the upper limit on the rate relative to the standard model expectation is 4.7 at 95% confidence level.", "doi": "10.1007/JHEP09(2016)027", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-09", "series_number": "9", "volume": "2016", "issue": "9", "pages": "Art. No. 27" }, { "id": "authors:sfej9-6fg37", "collection": "authors", "collection_id": "sfej9-6fg37", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160920-073507488", "type": "article", "title": "Measurement of the differential cross sections for top quark pair production as a function of kinematic event variables in pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements are reported of the normalized differential cross sections for top quark pair production with respect to four kinematic event variables: the missing transverse energy; the scalar sum of the jet transverse momentum (p_T); the scalar sum of the p_T of all objects in the event; and the p T of leptonically decaying W bosons from top quark decays. The data sample, collected using the CMS detector at the LHC, consists of 5.0\u2009\u2009fb^(\u22121) of proton-proton collisions at \u221as=7\u2009\u2009TeV and 19.7\u2009\u2009fb^(\u22121) at \u221as=8\u2009\u2009TeV. Top quark pair events containing one electron or muon are selected. The results are presented after correcting for detector effects to allow direct comparison with theoretical predictions. No significant deviations from the predictions of several standard model event simulation generators are observed.", "doi": "10.1103/PhysRevD.94.052006", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-09", "series_number": "5", "volume": "94", "issue": "5", "pages": "Art. No. 052006" }, { "id": "authors:zz1xn-5w022", "collection": "authors", "collection_id": "zz1xn-5w022", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161102-075125550", "type": "article", "title": "Search for Higgs boson off-shell production in proton-proton collisions at 7 and 8 TeV and derivation of constraints on its total decay width", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for the Higgs boson off-shell production in gluon fusion and vector boson fusion processes with the Higgs boson decaying into a W^+W^\u2212 pair and the W bosons decaying leptonically. The data observed in this analysis are used to constrain the Higgs boson total decay width. The analysis is based on the data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 4.9 fb^(\u22121) at a centre-of-mass energy of 7 TeV and 19.4 fb^(\u22121) at 8 TeV, respectively. An observed (expected) upper limit on the off-shell Higgs boson event yield normalised to the standard model prediction of 2.4 (6.2) is obtained at the 95% CL for the gluon fusion process and of 19.3 (34.4) for the vector boson fusion process. Observed and expected limits on the total width of 26 and 66 MeV are found, respectively, at the 95% confidence level (CL). These limits are combined with the previous result in the ZZ channel leading to observed and expected 95% CL upper limits on the width of 13 and 26 MeV, respectively.", "doi": "10.1007/JHEP09(2016)051", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-09", "series_number": "9", "volume": "2016", "issue": "9", "pages": "Art. No. 051" }, { "id": "authors:xvzke-e4s38", "collection": "authors", "collection_id": "xvzke-e4s38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170123-143024095", "type": "article", "title": "Measurement of the differential cross section and charge asymmetry for inclusive pp \u2192 W^(\u00b1) + X production at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The differential cross section and charge asymmetry for inclusive pp \u2192 W^(\u00b1) + X \u2192 \u03bc^(\u00b1)\u03bd + X production at \u221as = 8 TeV are measured as a function of muon pseudorapidity. The data sample corresponds to an integrated luminosity of 18.8 fb^(\u22121) recorded with the CMS detector at the LHC. These results provide important constraints on the parton distribution functions of the proton in the range of the Bjorken scaling variable x from 10^(\u22123) to 10^(\u22121).", "doi": "10.1140/epjc/s10052-016-4293-4", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-08-22", "series_number": "8", "volume": "76", "issue": "8", "pages": "Art. No. 469" }, { "id": "authors:3dhf3-ga784", "collection": "authors", "collection_id": "3dhf3-ga784", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170110-095319664", "type": "article", "title": "Study of Z boson production in pPb collisions at \u221aSNN = 5.02 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of Z bosons in pPb collisions at \u221aSNN = 5.02 TeV is studied by the CMS experiment via the electron and muon decay channels. The inclusive cross section is compared to pp collision predictions, and found to scale with the number of elementary nucleon\u2013nucleon collisions. The differential cross sections as a function of the Z boson rapidity and transverse momentum are measured. Though they are found to be consistent within uncertainty with theoretical predictions both with and without nuclear effects, the forward\u2013backward asymmetry suggests the presence of nuclear effects at large rapidities. These results provide new data for constraining nuclear parton distribution functions.", "doi": "10.1016/j.physletb.2016.05.044", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-08-10", "volume": "759", "pages": "36-57" }, { "id": "authors:40gtg-2x912", "collection": "authors", "collection_id": "40gtg-2x912", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170103-122821271", "type": "article", "title": "Search for supersymmetry in electroweak production with photons and large missing transverse energy in pp collisions at \u221as=8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported from a search for supersymmetry with gauge-mediated supersymmetry breaking in electroweak production. Final states with photons and large missing transverse energy (E^(miss)_(T)) were examined. The data sample was collected in pp collisions at \u221as=8 TeV with the CMS detector at the LHC and corresponds to 7.4fb^(\u22121). The analysis focuses on scenarios in which the lightest neutralino has bino-or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape undetected. The data were obtained using a specially designed trigger with dedicated low thresholds, providing good sensitivity to signatures with photons, E^(miss)_(T), and low hadronic energy. No excess of events over the standard model expectation is observed. The results are interpreted using the model of general gauge mediation. With the wino mass fixed at 10GeV above that of the bino, wino masses below 710GeV are excluded at 95% confidence level. Constraints are also set in the context of two simplified models, for which the analysis sets the lowest cross section limits on the electroweak production of supersymmetric particles.", "doi": "10.1016/j.physletb.2016.05.088", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-08-10", "volume": "759", "pages": "479-500" }, { "id": "authors:yb1tf-ppq34", "collection": "authors", "collection_id": "yb1tf-ppq34", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170109-154355610", "type": "article", "title": "Search for supersymmetry in events with soft leptons, low jet multiplicity, and missing transverse energy in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for supersymmetric particles in scenarios with small mass splittings. The data sample corresponds to 19.7 fb^(\u22121) of proton\u2013proton collisions recorded by the CMS experiment at \u221as = 8 TeV. The search targets top squark (t) pair production in scenarios with mass differences \u0394m = m (t)\u2212m(_(\u03c7\u02dc1)^0) below the W-boson mass and with top-squark decays in the four-body mode (t) \u2192 b\u2113 \u03bd_(\u03c7\u02dc1)^0), where the neutralino (\u03c7_1^0) is assumed to be the lightest supersymmetric particle (LSP). The signature includes a high transverse momentum (p_T) jet associated with initial-state radiation, one or two low-pT leptons, and significant missing transverse energy. The event yields observed in data are consistent with the expected background contributions from standard model processes. Limits are set on the cross section for top squark pair production as a function of the t and LSP masses. Assuming a 100% branching fraction for the four-body decay mode, top-squark masses below 316 GeV are excluded for \u0394m=25 GeV at 95% CL. The dilepton data are also interpreted under the assumption of chargino\u2013neutralino production, with subsequent decays to sleptons or sneutrinos. Assuming a difference between the common \u03c7_\u02dc1^+/\u03c7_\u02dc2^0 mass and the LSP mass of 20 GeV and a \u03c4 -enriched decay scenario, masses in the range m(\u03c7_\u02dc1^+) < 307 GeV are excluded at 95% CL.", "doi": "10.1016/j.physletb.2016.05.033", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-08-10", "volume": "759", "pages": "9-35" }, { "id": "authors:cf626-djh07", "collection": "authors", "collection_id": "cf626-djh07", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170110-102624789", "type": "article", "title": "Search for neutral resonances decaying into a Z boson and a pair of b jets or \u03c4 leptons", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for a new resonance decaying into a lighter resonance and a Z boson. Two channels are studied, targeting the decay of the lighter resonance into either a pair of oppositely charged \u03c4 leptons or a View the MathML sourcebb\u203e pair. The Z boson is identified via its decays to electrons or muons. The search exploits data collected by the CMS experiment at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.8 fb^(\u22121). No significant deviations are observed from the standard model expectation and limits are set on production cross sections and parameters of two-Higgs-doublet models.", "doi": "10.1016/j.physletb.2016.05.087", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-08-10", "volume": "759", "pages": "369-394" }, { "id": "authors:pf8nh-dwc44", "collection": "authors", "collection_id": "pf8nh-dwc44", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170113-103448968", "type": "article", "title": "Measurement of the inelastic cross section in proton\u2013lead collisions at \u221aSNN = 5.02 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The inelastic hadronic cross section in proton\u2013lead collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV is measured with the CMS detector at the LHC. The data sample, corresponding to an integrated luminosity of L=12.6\u00b10.4 nb^(\u22121), has been collected with an unbiased trigger for inclusive particle production. The cross section is obtained from the measured number of proton\u2013lead collisions with hadronic activity produced in the pseudorapidity ranges 3<\u03b7<5 and/or \u22125<\u03b7<\u22123, corrected for photon-induced contributions, experimental acceptance, and other instrumental effects. The inelastic cross section is measured to be \u03c3_(inel)(pPb)=2061\u00b13(stat)\u00b134(syst)\u00b172(lumi) mb. Various Monte Carlo generators, commonly used in heavy ion and cosmic ray physics, are found to reproduce the data within uncertainties. The value of \u03c3_(inel)(pPb is compatible with that expected from the proton\u2013proton cross section at 5.02 TeV scaled up within a simple Glauber approach to account for multiple scatterings in the lead nucleus, indicating that further net nuclear corrections are small.", "doi": "10.1016/j.physletb.2016.06.027", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-08-10", "volume": "759", "pages": "641-662" }, { "id": "authors:hmk0c-10540", "collection": "authors", "collection_id": "hmk0c-10540", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170109-110710712", "type": "article", "title": "Combined search for anomalous pseudoscalar HVV couplings in VH(H\u2192bb) production and H \u2192 VV decay", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" } ], "abstract": "A search for anomalous pseudoscalar couplings of the Higgs boson H to electroweak vector bosons V (=W or Z) in a sample of proton\u2013proton collision events corresponding to an integrated luminosity of 18.9 fb^(\u22121) at a center-of-mass energy of 8 TeV is presented. Events consistent with the topology of associated VH production, where the Higgs boson decays to a pair of bottom quarks and the vector boson decays leptonically, are analyzed. The consistency of data with a potential pseudoscalar contribution to the HVV interaction, expressed by the effective pseudoscalar cross section fractions f_a_3, is assessed by means of profile likelihood scans. Results are given for the VH channels alone and for a combined analysis of the VH and previously published H\u2192VV channels. Under certain assumptions, f_(a3)^(ZZ)>0.0034 is excluded at 95% confidence level in the combination. Scenarios in which these assumptions are relaxed are also considered.", "doi": "10.1016/j.physletb.2016.06.004", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-08-10", "volume": "759", "pages": "672-696" }, { "id": "authors:ch58y-08r59", "collection": "authors", "collection_id": "ch58y-08r59", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160705-133353269", "type": "article", "title": "Downtown Los Angeles 52-Story High-Rise and Free-Field Response to an Oil Refinery Explosion", "author": [ { "family_name": "Kohler", "given_name": "Monica D.", "orcid": "0000-0002-4703-190X", "clpid": "Kohler-M-D" }, { "family_name": "Massari", "given_name": "Anthony", "orcid": "0000-0002-6561-4674", "clpid": "Massari-A" }, { "family_name": "Heaton", "given_name": "Thomas H.", "orcid": "0000-0003-3363-2197", "clpid": "Heaton-T-H" }, { "family_name": "Kanamori", "given_name": "Hiroo", "orcid": "0000-0001-8219-9428", "clpid": "Kanamori-H" }, { "family_name": "Hauksson", "given_name": "Egill", "orcid": "0000-0002-6834-5051", "clpid": "Hauksson-E" }, { "family_name": "Guy", "given_name": "Richard", "orcid": "0000-0002-8651-5608", "clpid": "Guy-R" }, { "family_name": "Clayton", "given_name": "Robert W.", "orcid": "0000-0003-3323-3508", "clpid": "Clayton-R-W" }, { "family_name": "Bunn", "given_name": "Julian J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chandy", "given_name": "K. M.", "orcid": "0000-0001-9190-1290", "clpid": "Chandy-K-M" } ], "abstract": "The ExxonMobil Corp. oil refinery in Torrance, California experienced an explosion on February 18, 2015 causing ground shaking equivalent to a magnitude 2.0 earthquake. The impulse response for the source was computed from Southern California Seismic Network data for a single force system with a value of 2\u00d710^5 kN vertically downward. The refinery explosion produced an air pressure wave that was recorded 22.8 km away in a 52-story high-rise building in downtown Los Angeles by a dense accelerometer array that is a component of the Community Seismic Network. The array recorded anomalous waveforms on each floor displaying coherent arrivals that are consistent with the building's elastic response to a pressure wave caused by the refinery explosion. Using a finite-element model of the building, the force on the building on a floor-by-floor scale was found to range up to 1.42 kN, corresponding to a pressure perturbation of 7.7 Pa.", "doi": "10.1193/062315EQS101M", "issn": "8755-2930", "publisher": "Earthquake Engineering Research Institute", "publication": "Earthquake Spectra", "publication_date": "2016-08-01", "series_number": "3", "volume": "32", "issue": "3", "pages": "1793-1820" }, { "id": "authors:rdm7t-nq726", "collection": "authors", "collection_id": "rdm7t-nq726", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161221-142114274", "type": "article", "title": "Evidence for exclusive \u03b3\u03b3 \u2192 W+W\u2212 production and constraints on anomalous quartic gauge couplings in pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for exclusive or quasi-exclusive \u03b3\u03b3 \u2192 W+W\u2212 production, via pp \u2192 p(*)W+W\u2212p(*) \u2192 p(*)\u03bc\u00b1e\u2213p(*) at \u221as=8 TeV, is reported using data corresponding to an integrated luminosity of 19.7 fb^(\u22121). Events are selected by requiring the presence of an electron-muon pair with large transverse momentum pT(\u03bc\u00b1e\u2213) > 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 fb^(\u22121) of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 \u00b1 0.6 (0.84 \u00b1 0.15) events for 8 (7) TeV, resulting in a combined excess of 3.4\u03c3 over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive \u03b3\u03b3 \u2192 W+W\u2212 production. Upper limits on the anomalous quartic gauge coupling operators a_(0,C)^W (dimension-6) and f_(M0,1,2,3) (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.", "doi": "10.1007/JHEP08(2016)119", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-08", "series_number": "8", "volume": "2016", "issue": "8", "pages": "Art. No. 119" }, { "id": "authors:jjvgk-va393", "collection": "authors", "collection_id": "jjvgk-va393", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170227-114456409", "type": "article", "title": "Search for supersymmetry in pp collisions at \u221as = 13 TeV in the single-lepton final state using the sum of masses of large-radius jets", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported from a search for supersymmetric particles in proton-proton collisions in the final state with a single, high transverse momentum lepton; multiple jets, including at least one b-tagged jet; and large missing transverse momentum. The data sample corresponds to an integrated luminosity of 2.3 fb^(\u22121) at \u221as = 13 TeV, recorded by the CMS experiment at the LHC. The search focuses on processes leading to high jet multiplicities, such as gluino pair production with g \u2192 tt\u03c7^0_1. The quantity MJ, defined as the sum of the masses of the large-radius jets in the event, is used in conjunction with other kinematic variables to provide discrimination between signal and background and as a key part of the background estimation method. The observed event yields in the signal regions in data are consistent with those expected for standard model backgrounds, estimated from control regions in data. Exclusion limits are obtained for a simplified model corresponding to gluino pair production with three-body decays into top quarks and neutralinos. Gluinos with a mass below 1600 GeV are excluded at a 95% confidence level for scenarios with low \u03c7^0_1 mass, and neutralinos with a mass below 800 GeV are excluded for a gluino mass of about 1300 GeV. For models with two-body gluino decays producing on-shell top squarks, the excluded region is only weakly sensitive to the top squark mass.", "doi": "10.1007/JHEP08(2016)122", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-08", "series_number": "8", "volume": "2016", "issue": "8", "pages": "Art. No. 122" }, { "id": "authors:xdz9b-2ee34", "collection": "authors", "collection_id": "xdz9b-2ee34", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170320-150620393", "type": "article", "title": "Measurement of the tt production cross section in the e\u00b5 channel in proton-proton collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The inclusive cross section for top quark pair production is measured in proton-proton collisions at \u221as = 7 and 8 TeV, corresponding to 5.0 and 19.7 fb^(\u22121), respectively, with the CMS experiment at the LHC. The cross sections are measured in the electron-muon channel using a binned likelihood fit to multi-differential final state distributions related to identified b quark jets and other jets in the event. The measured cross section values are 173.6\u2009\u00b1\u20092.1(stat)_(\u22124.0)^(+4.5)(syst)\u2009\u00b1\u20093.8(lumi)pb at \u221as = 7 TeV, and 244.9\u2009\u00b1\u20091.4(stat)_(\u22125.5)^(+6.3)(syst)\u2009\u00b1 6.4(lumi)pb at \u221as = 8 TeV, in good agreement with QCD calculations at next-to-next-to-leading-order accuracy. The ratio of the cross sections measured at 7 and 8 TeV is determined, as well as cross sections in the fiducial regions defined by the acceptance requirements on the two charged leptons in the final state. The cross section results are used to determine the top quark pole mass via the dependence of the theoretically predicted cross section on the mass, giving a best result of 173.8_(\u22121.8)^(+1.7) GeV. The data at \u221as = 8 TeV are also used to set limits, for two neutralino mass values, on the pair production of supersymmetric partners of the top quark with masses close to the top quark mass.", "doi": "10.1007/JHEP08(2016)029", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-08", "volume": "2016", "pages": "Art. No. 29" }, { "id": "authors:8k1d1-63j97", "collection": "authors", "collection_id": "8k1d1-63j97", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170324-153103203", "type": "article", "title": "Measurement of the double-differential inclusive jet cross section in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the double-differential inclusive jet cross section as a function of jet transverse momentum pT and absolute jet rapidity |y| is presented. The analysis is based on proton\u2013proton collisions collected by the CMS experiment at the LHC at a centre-of-mass energy of 13TeV. The data samples correspond to integrated luminosities of 71 and 44 pb^(-1) for |y|<3 and 3.2<|y|<4.7, respectively. Jets are reconstructed with the anti-k_t clustering algorithm for two jet sizes, R, of 0.7 and 0.4, in a phase space region covering jet pT up to 2TeV and jet rapidity up to |y| = 4.7. Predictions of perturbative quantum chromodynamics at next-to-leading order precision, complemented with electroweak and nonperturbative corrections, are used to compute the absolute scale and the shape of the inclusive jet cross section. The cross section difference in R, when going to a smaller jet size of 0.4, is best described by Monte Carlo event generators with next-to-leading order predictions matched to parton showering, hadronisation, and multiparton interactions. In the phase space accessible with the new data, this measurement provides a first indication that jet physics is as well understood at \u221as = 13TeV as at smaller centre-of-mass energies.", "doi": "10.1140/epjc/s10052-016-4286-3", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-08", "volume": "76", "pages": "Art. No. 451" }, { "id": "authors:46kc4-km572", "collection": "authors", "collection_id": "46kc4-km572", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161109-151311050", "type": "article", "title": "Search for new physics in same-sign dilepton events in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics is performed using events with two isolated same-sign leptons, two or more jets, and missing transverse momentum. The results are based on a sample of proton\u2013proton collisions at a center-of-mass energy of 13TeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 2.3 fb^1. Multiple search regions are defined by classifying events in terms of missing transverse momentum, the scalar sum of jet transverse momenta, the transverse mass associated with a W boson candidate, the number of jets, the number of b quark jets, and the transverse momenta of the leptons in the event. The analysis is sensitive to a wide variety of possible signals beyond the standard model. No excess above the standard model background expectation is observed. Constraints are set on various supersymmetric models, with gluinos and bottom squarks excluded for masses up to 1300 and 680GeV, respectively, at the 95 % confidence level. Upper limits on the cross sections for the production of two top quark-antiquark pairs (119fb) and two same-sign top quarks (1.7pb) are also obtained. Selection efficiencies and model independent limits are provided to allow further interpretations of the results.", "doi": "10.1140/epjc/s10052-016-4261-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-08", "series_number": "8", "volume": "76", "issue": "8", "pages": "Art. No. 439" }, { "id": "authors:kca5g-xpg12", "collection": "authors", "collection_id": "kca5g-xpg12", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170130-103715172", "type": "article", "title": "Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported from a search for the pair production of top squarks, the supersymmetric partners of top quarks, in final states with jets and missing transverse momentum. The data sample used in this search was collected by the CMS detector and corresponds to an integrated luminosity of 18.9fb^(-1) of proton-proton collisions at a centre-of-mass energy of 8 TeV produced by the LHC. The search features novel background suppression and prediction methods, including a dedicated top quark pair reconstruction algorithm. The data are found to be in agreement with the predicted backgrounds. Exclusion limits are set in simplified supersymmetry models with the top squark decaying to jets and an undetected neutralino, either through a top quark or through a bottom quark and chargino. Models with the top squark decaying via a top quark are excluded for top squark masses up to 755 GeV in the case of neutralino masses below 200 GeV. For decays via a chargino, top squark masses up to 620 GeV are excluded, depending on the masses of the chargino and neutralino.", "doi": "10.1140/epjc/s10052-016-4292-5", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-08", "series_number": "8", "volume": "76", "issue": "8", "pages": "Art. No. 460" }, { "id": "authors:14kfj-ar119", "collection": "authors", "collection_id": "14kfj-ar119", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160822-153500777", "type": "article", "title": "Search for Resonant Production of High-Mass Photon Pairs in Proton-Proton Collisions at s=\u221a8 and 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Lawhorn", "given_name": "J. M.", "orcid": "0000-0002-8597-9259", "clpid": "Lawhorn-J-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the resonant production of high-mass photon pairs is presented. The analysis is based on samples of proton-proton collision data collected by the CMS experiment at center-of-mass energies of 8 and 13 TeV, corresponding to integrated luminosities of 19.7 and 3.3\u2009\u2009fb^(\u22121), respectively. The interpretation of the search results focuses on spin-0 and spin-2 resonances with masses between 0.5 and 4 TeV and with widths, relative to the mass, between 1.4\u00d710^(\u22124) and 5.6\u00d710^(\u22122). Limits are set on scalar resonances produced through gluon-gluon fusion, and on Randall-Sundrum gravitons. A modest excess of events compatible with a narrow resonance with a mass of about 750 GeV is observed. The local significance of the excess is approximately 3.4 standard deviations. The significance is reduced to 1.6 standard deviations once the effect of searching under multiple signal hypotheses is considered. More data are required to determine the origin of this excess.", "doi": "10.1103/PhysRevLett.117.051802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2016-07-28", "series_number": "5", "volume": "117", "issue": "5", "pages": "Art. No. 051802" }, { "id": "authors:xzgdt-w2926", "collection": "authors", "collection_id": "xzgdt-w2926", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160812-084249638", "type": "article", "title": "Search for Narrow Resonances in Dijet Final States at \u221as = 8 TeV with the Novel CMS Technique of Data Scouting", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for narrow resonances decaying into dijet final states is performed on data from proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 18.8\u2009\u2009fb^(\u22121). The data were collected with the CMS detector using a novel technique called data scouting, in which the information associated with these selected events is much reduced, permitting collection of larger data samples. This technique enables CMS to record events containing jets at a rate of 1 kHz, by collecting the data from the high-level-trigger system. In this way, the sensitivity to low-mass resonances is increased significantly, allowing previously inaccessible couplings of new resonances to quarks and gluons to be probed. The resulting dijet mass distribution yields no evidence of narrow resonances. Upper limits are presented on the resonance cross sections as a function of mass, and compared with a variety of models predicting narrow resonances. The limits are translated into upper limits on the coupling of a leptophobic resonance Z\u2032_B to quarks, improving on the results obtained by previous experiments for the mass range from 500 to 800 GeV.", "doi": "10.1103/PhysRevLett.117.031802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2016-07-15", "series_number": "3", "volume": "117", "issue": "3", "pages": "Art. No. 031802" }, { "id": "authors:ce6gr-6qk19", "collection": "authors", "collection_id": "ce6gr-6qk19", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160705-115755080", "type": "article", "title": "Search for supersymmetry in the multijet and missing transverse momentum final state in pp collisions at 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics is performed based on all-hadronic events with large missing transverse momentum produced in proton\u2013proton collisions at \u221as = 13 TeV. The data sample, corresponding to an integrated luminosity of 2.3 fb^(\u22121), was collected with the CMS detector at the CERN LHC in 2015. The data are examined in search regions of jet multiplicity, tagged bottom quark jet multiplicity, missing transverse momentum, and the scalar sum of jet transverse momenta. The observed numbers of events in all search regions are found to be consistent with the expectations from standard model processes. Exclusion limits are presented for simplified supersymmetric models of gluino pair production. Depending on the assumed gluino decay mechanism, and for a massless, weakly interacting, lightest neutralino, lower limits on the gluino mass from 1440 to 1600 GeV are obtained, significantly extending previous limits.", "doi": "10.1016/j.physletb.2016.05.002", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-07-10", "volume": "758", "pages": "152-180" }, { "id": "authors:0574v-xmd97", "collection": "authors", "collection_id": "0574v-xmd97", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160711-064720149", "type": "article", "title": "Measurement of spin correlations in tt production using the matrix element method in the muon+jets final state in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "Ren-Yuan", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The consistency of the spin correlation strength in top quark pair production with the standard model (SM) prediction is tested in the muon+jets final state. The events are selected from pp collisions, collected by the CMS detector, at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb^(\u22121). The data are compared with the expectation for the spin correlation predicted by the SM and with the expectation of no correlation. Using a template fit method, the fraction of events that show SM spin correlations is measured to be View the MathML source0.72\u00b10.08(stat)_(\u22120.13)^(+0.15)(syst), representing the most precise measurement of this quantity in the muon+jets final state to date.", "doi": "10.1016/j.physletb.2016.05.005", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-07-10", "volume": "758", "pages": "321-346" }, { "id": "authors:pnpwh-7sw38", "collection": "authors", "collection_id": "pnpwh-7sw38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160705-101043917", "type": "article", "title": "Search for a low-mass pseudoscalar Higgs boson produced in association with a bb pair in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is reported for a light pseudoscalar Higgs boson decaying to a pair of \u03c4 leptons, produced in association with a bb pair, in the context of two-Higgs-doublet models. The results are based on pp collision data at a centre-of-mass energy of 8 TeV collected by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7 fb^(\u22121). Pseudoscalar boson masses between 25 and 80 GeV are probed. No evidence for a pseudoscalar boson is found and upper limits are set on the product of cross section and branching fraction to \u03c4 pairs between 7 and 39 pb at the 95% confidence level. This excludes pseudoscalar A bosons with masses between 25 and 80 GeV, with SM-like Higgs boson negative couplings to down-type fermions, produced in association with bb pairs, in Type II, two-Higgs-doublet models.", "doi": "10.1016/j.physletb.2016.05.003", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-07-10", "volume": "758", "pages": "296-320" }, { "id": "authors:szqck-6f755", "collection": "authors", "collection_id": "szqck-6f755", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170328-141321538", "type": "article", "title": "Measurement of the W^+ W^\u2212 cross section in pp collisions at \u221as = 8 TeV and limits on anomalous gauge couplings", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the W boson pair production cross section in proton-proton collisions at \u221as = 8 TeV is presented. The data collected with the CMS detector at the LHC correspond to an integrated luminosity of 19.4 fb^(-1). The W^+W^\u2212 candidates are selected from events with two charged leptons, electrons or muons, and large missing transverse energy. The measured W^+W^\u2212 cross section is 60.1 \u00b1 0.9(stat) \u00b1 3.2 (exp) \u00b1 3.1(theo)\u00b11.6 (lumi)\\,pb = 60.1 \u00b1 4.8\\,pb60.1 \u00b1 0.9 (stat) \u00b13.2 (exp)\u00b13.1 (theo) \u00b1 1.6 (lumi)\\,pb = 60.1 \u00b1 4.8\\, pb, consistent with the standard model prediction. The W^+W^\u2212 cross sections are also measured in two different fiducial phase space regions. The normalized differential cross section is measured as a function of kinematic variables of the final-state charged leptons and compared with several perturbative QCD predictions. Limits on anomalous gauge couplings associated with dimension-six operators are also given in the framework of an effective field theory. The corresponding 95 % confidence level intervals are \u22125.7", "doi": "10.1140/epjc/s10052-016-4219-1", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-07", "series_number": "7", "volume": "76", "issue": "7", "pages": "Art. No. 401" }, { "id": "authors:dmcp1-4kv89", "collection": "authors", "collection_id": "dmcp1-4kv89", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160922-123149210", "type": "article", "title": "Measurement of tt production with additional jet activity, including b quark jets, in the dilepton decay channel using pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Jet multiplicity distributions in top quark pair (tt) events are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC using a data set corresponding to an integrated luminosity of 19.7fb^(-1). The measurement is performed in the dilepton decay channels (e^+e^\u2212, \u03bc^+\u03bc^\u2212, and e^\u00b1\u03bc^\u2213). The absolute and normalized differential cross sections for tt production are measured as a function of the jet multiplicity in the event for different jet transverse momentum thresholds and the kinematic properties of the leading additional jets. The differential ttb and ttbb cross sections are presented for the first time as a function of the kinematic properties of the leading additional b jets. Furthermore, the fraction of events without additional jets above a threshold is measured as a function of the transverse momenta of the leading additional jets and the scalar sum of the transverse momenta of all additional jets. The data are compared and found to be consistent with predictions from several perturbative quantum chromodynamics event generators and a next-to-leading order calculation.", "doi": "10.1140/epjc/s10052-016-4105-x", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-07", "series_number": "7", "volume": "76", "issue": "7", "pages": "Art. No. 379" }, { "id": "authors:z8285-99j31", "collection": "authors", "collection_id": "z8285-99j31", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160920-082025884", "type": "article", "title": "Measurement of inclusive jet production and nuclear\n modifications in pPb collisions at \u221asNN = 5.02 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Inclusive jet production in pPb collisions at a nucleon\u2013nucleon (NN) center-of-mass energy of \u221asNN = 5.02 TeV is studied with the CMS detector at the LHC. A data sample corresponding to an integrated luminosity of 30.1 nb^(\u22121) is analyzed. The jet transverse momentum spectra are studied in seven pseudorapidity intervals covering the range \u22122.0 < \u03b7CM < 1.5 in the NN center-of-mass frame. The jet production yields at forward and backward pseudorapidity are compared and no significant asymmetry about \u03b7 CM = 0 is observed in the measured kinematic range. The measurements in the pPb system are compared to reference jet spectra obtained by extrapolation from previous measurements in pp collisions at \u221as = 7 TeV. In all pseudorapidity ranges, nuclear modifications in inclusive jet production are found to be small, as predicted by next-to-leading order perturbative QCD calculations that incorporate nuclear effects in the parton distribution functions.", "doi": "10.1140/epjc/s10052-016-4205-7", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-07", "series_number": "7", "volume": "76", "issue": "7", "pages": "Art. No. 372" }, { "id": "authors:n53sa-dbc19", "collection": "authors", "collection_id": "n53sa-dbc19", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170314-103547024", "type": "article", "title": "Search for heavy resonances decaying to two Higgs bosons in final states containing four b quarks", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for narrow heavy resonances X decaying into pairs of Higgs bosons ( HH ) in proton-proton collisions collected by the CMS experiment at the LHC at \u221as = 8TeV. The data correspond to an integrated luminosity of 19.7 fb^(\u22121). The search considers HH resonances with masses between 1 and 3 TeV, having final states of two b quark pairs. Each Higgs boson is produced with large momentum, and the hadronization products of the pair of b quarks can usually be reconstructed as single large jets. The background from multijet and tt events is significantly reduced by applying requirements related to the flavor of the jet, its mass, and its substructure. The signal would be identified as a peak on top of the dijet invariant mass spectrum of the remaining background events. No evidence is observed for such a signal. Upper limits obtained at 95 % confidence level for the product of the production cross section and branching fraction \u03c3(gg\u2192X)B(X\u2192HH\u2192bbbb) range from 10 to 1.5\\,fb for the mass of X from 1.15 to 2.0 TeV, significantly extending previous searches. For a warped extra dimension theory with a mass scale \u039b_R = 1 TeV , the data exclude radion scalar masses between 1.15 and 1.55 TeV. .", "doi": "10.1140/epjc/s10052-016-4206-6", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-07", "series_number": "7", "volume": "76", "issue": "7", "pages": "Art. No. 371" }, { "id": "authors:wyecx-mgn79", "collection": "authors", "collection_id": "wyecx-mgn79", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161214-070555461", "type": "article", "title": "Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported from a search for the top squark t_1, the lighter of the two supersymmetric partners of the top quark. The data sample corresponds to 19.7 fb^(\u22121) of proton-proton collisions at \u221as = 8 TeV collected with the CMS detector at the LHC. The search targets t_1 \u2192 b_\u03c7_1\u00b1 and t_1 \u2192 t(\u2217) \u03c7^0_1 decay modes, where \u03c7_1\u00b1 and \u03c7^0_1 are the lightest chargino and neutralino, respectively. The reconstructed final state consists of jets, b jets, missing transverse energy, and either one or two leptons. Leading backgrounds are determined from data. No significant excess in data is observed above the expectation from standard model processes. The results exclude a region of the two-dimensional plane of possible t_1 and \u03c7^0_1 masses. The highest excluded t_1 and \u03c7^0_1 masses are about 700 GeV and 250 GeV, respectively.", "doi": "10.1007/JHEP07(2016)027", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-07", "series_number": "7", "volume": "2016", "issue": "7", "pages": "Art. No. 027" }, { "id": "authors:dmrzq-4gz08", "collection": "authors", "collection_id": "dmrzq-4gz08", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160624-114206724", "type": "article", "title": "Measurement of the CP-violating weak phase \u03c6_s and the decay width difference \u0394\u0393_s using the B^0_s \u2192 J/\u03c8\u03c6(1020)decay channel in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The CP-violating weak phase \u03d5_s of the B^0_s meson and the decay width difference \u0394\u0393_s of the B^0_s light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of B^0_s \u2192 J/\u03c8\u03c6(1020) \u2192 \u00b5^+\u00b5^-K^+K^- decays. The analysed data set corresponds to an integrated luminosity of 19.7 fb^(-1) collected in pp collisions at a centre-of-mass energy of 8 TeV. A total of 49\u2009200 reconstructed B^0_s decays are used to extract the values of \u03d5_s and \u0394\u0393_s by performing a time-dependent and flavour-tagged angular analysis of the \u03bc^+\u03bc^\u2212K^+K^\u2212 final state. The weak phase is measured to be \u03d5_s =-0.075 \u00b1 0.097(stat) \u00b1 0.031(syst) rad, and the decay width difference is \u0394\u0393_s = 0.095 \u00b1 0.013(stat) \u00b1 0.007(syst) ps^(-1).", "doi": "10.1016/j.physletb.2016.03.046", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-06-10", "volume": "757", "pages": "97-120" }, { "id": "authors:gzjw3-jvv76", "collection": "authors", "collection_id": "gzjw3-jvv76", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160627-084632705", "type": "article", "title": "Search for supersymmetry in events with a photon, a lepton, and missing transverse momentum in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for supersymmetry involving events with at least one photon, one electron or muon, and large missing transverse momentum has been performed by the CMS experiment. The data sample corresponds to an integrated luminosity of 19.7 fb^(\u22121) of pp collisions at \u221as = 8 TeV, produced at the CERN LHC. No excess of events is observed beyond expectations from standard model processes. The result of the search is interpreted in the context of a general model of gauge-mediated supersymmetry breaking, where the charged and neutral winos are the next-to-lightest supersymmetric particles. Within this model, winos with a mass up to 360 GeV are excluded at the 95% confidence level. Two simplified models inspired by gauge-mediated supersymmetry breaking are also examined, and used to derive upper limits on the production cross sections of specific supersymmetric processes.", "doi": "10.1016/j.physletb.2016.03.039", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-06-10", "volume": "757", "pages": "6-31" }, { "id": "authors:q3p6q-me346", "collection": "authors", "collection_id": "q3p6q-me346", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160628-071348438", "type": "article", "title": "Inclusive and differential measurements of the tt charge asymmetry in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The tt charge asymmetry is measured in proton\u2013proton collisions at a centre-of-mass energy of 8 TeV8 TeV. The data, collected with the CMS experiment at the LHC, correspond to an integrated luminosity of 19.7 fb^(\u22121). Selected events contain an electron or a muon and four or more jets, where at least one jet is identified as originating from b-quark hadronization. The inclusive charge asymmetry is found to be 0.0010\u00b10.0068\u2009(stat)\u00b10.0037\u2009(syst)0.0010\u00b10.0068\u2009(stat)\u00b10.0037\u2009(syst). In addition, differential charge asymmetries as a function of rapidity, transverse momentum, and invariant mass of the tt system are studied. For the first time at the LHC, the measurements are also performed in a reduced fiducial phase space of top quark pair production, with an integrated result of \u22120.0035\u00b10.0072\u2009(stat)\u00b10.0031\u2009(syst)\u22120.0035\u00b10.0072\u2009(stat)\u00b10.0031\u2009(syst). All measurements are consistent within two standard deviations with zero asymmetry as well as with the predictions of the standard model.", "doi": "10.1016/j.physletb.2016.03.060", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-06-10", "volume": "757", "pages": "154-179" }, { "id": "authors:c84z5-pvg24", "collection": "authors", "collection_id": "c84z5-pvg24", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161130-091955973", "type": "article", "title": "Forward\u2013backward asymmetry of Drell\u2013Yan lepton pairs in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "Maria", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the forward\u2013backward asymmetry A_(FB) of oppositely charged lepton pairs (\u03bc\u03bc and ee) produced via Z/\u03b3\u2217 boson exchange in pp collisions at \u221as =8 TeV is presented. The data sample corresponds to an integrated luminosity of 19.7 fb^(\u22121) collected with the CMS detector at the LHC. The measurement of A_(FB) is performed for dilepton masses between 40GeV and 2TeV and for dilepton rapidity up to 5. The A_(FB) measurements as a function of dilepton mass and rapidity are compared with the standard model predictions.", "doi": "10.1140/epjc/s10052-016-4156-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-06", "series_number": "6", "volume": "76", "issue": "6", "pages": "Art. No. 325" }, { "id": "authors:tgexj-q5065", "collection": "authors", "collection_id": "tgexj-q5065", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161118-093609359", "type": "article", "title": "Search for lepton flavour violating decays of heavy resonances and quantum black holes to an e\u03bc pair in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for narrow resonances decaying to an electron and a muon is presented. The e\u03bc mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBHs). The analysis is performed using data corresponding to an integrated luminosity of 19.7 fb^(-1) collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. With no evidence for physics beyond the standard model in the invariant mass spectrum of selected e\u03bc pairs, upper limits are set at 95 % confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation. In the search for narrow resonances, the resonant production of a \u03c4 sneutrino in R-parity violating supersymmetry is considered. The \u03c4 sneutrino is excluded for masses below 1.28 TeV for couplings \u03bb_(132) =\u03bb_(231) =\u03bb\u2032_(311) =0.01, and below 2.30 TeV for \u03bb_(132) =\u03bb_(231) =0.07 \u03bb and \u03bb\u2032_(311) =0.11. These are the most stringent limits to date from direct searches at high-energy colliders. In addition, the resonance searches are interpreted in terms of a model with heavy partners of the Z boson and the photon. In a framework of TeV-scale quantum gravity based on a renormalization of Newton's constant, the search for non-resonant contributions to the e\u03bc mass spectrum excludes QBH production below a threshold mass M_(th) of 1.99 TeV. In models that invoke extra dimensions, the bounds range from 2.36 TeV for one extra dimension to 3.63 TeV for six extra dimensions. This is the first search for QBHs decaying into the e\u03bc final state.", "doi": "10.1140/epjc/s10052-016-4149-y", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-06", "series_number": "6", "volume": "76", "issue": "6", "pages": "Art. No. 317" }, { "id": "authors:4ctaz-b6e38", "collection": "authors", "collection_id": "4ctaz-b6e38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160805-114041933", "type": "article", "title": "Search for the associated production of a Higgs boson with a single top quark in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper presents the search for the production of a Higgs boson in association with a single top quark (tHq), using data collected in proton-proton collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb^(\u22121). The search exploits a variety of Higgs boson decay modes resulting in final states with photons, bottom quarks, and multiple charged leptons, including tau leptons, and employs a variety of multivariate techniques to maximize sensitivity to the signal. The analysis is optimized for the opposite sign of the Yukawa coupling to that in the standard model, corresponding to a large enhancement of the signal cross section. In the absence of an excess of candidate signal events over the background predictions, 95% confidence level observed (expected) upper limits on anomalous tHq production are set, ranging between 600 (450) fb and 1000 (700) fb depending on the assumed diphoton branching fraction of the Higgs boson. This is the first time that results on anomalous tHq production have been reported.", "doi": "10.1007/JHEP06(2016)177", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-06", "series_number": "6", "volume": "2016", "issue": "6", "pages": "Art. No. 177" }, { "id": "authors:eeehw-pjg71", "collection": "authors", "collection_id": "eeehw-pjg71", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160711-125800905", "type": "article", "title": "Search for pair-produced vectorlike B quarks in proton-proton collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "Ren-Yuan", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the production of a heavy B quark, having electric charge \u22121/3 and vector couplings to W, Z, and H bosons, is carried out using proton-proton collision data recorded at the CERN LHC by the CMS experiment, corresponding to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121). The B quark is assumed to be pair produced and to decay in one of three ways: to tW, bZ, or bH. The search is carried out in final states with one, two, and more than two charged leptons, as well as in fully hadronic final states. Each of the channels in the exclusive final-state topologies is designed to be sensitive to specific combinations of the B quark-antiquark pair decays. The observed event yields are found to be consistent with the standard model expectations in all the final states studied. A statistical combination of these results is performed, and upper limits are set on the cross section of the strongly produced B quark-antiquark pairs as a function of the B quark mass. Lower limits on the B quark mass between 740 and 900 GeV are set at a 95% confidence level, depending on the values of the branching fractions of the B quark to tW, bZ, and bH. Overall, these limits are the most stringent to date.", "doi": "10.1103/PhysRevD.93.112009", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-06", "series_number": "11", "volume": "93", "issue": "11", "pages": "Art. No. 112009" }, { "id": "authors:9423c-6e132", "collection": "authors", "collection_id": "9423c-6e132", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171006-085803597", "type": "article", "title": "Measurement of the inclusive jet cross section in pp collisions at \u221as = 2.76 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The double-differential inclusive jet cross section is measured as a function of jet transverse momentum p_T and absolute rapidity |y|, using proton-proton collision data collected with the CMS experiment at the LHC, at a center-of-mass energy of s\u221a = 2.76 TeV and corresponding to an integrated luminosity of 5.43 pb^(\u22121). Jets are reconstructed within the p_T range of 74 to 592 GeVand the rapidity range |y| < 3.0. The reconstructed jet spectrum is corrected for detector resolution. The measurements are compared to the theoretical prediction at next-to-leading-order QCD using different sets of parton distribution functions. This inclusive cross section measurement explores a new kinematic region and is consistent with QCD predictions.", "doi": "10.1140/epjc/s10052-016-4083-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-05-12", "series_number": "5", "volume": "76", "issue": "5", "pages": "Art. No. 265" }, { "id": "authors:hty58-rtt02", "collection": "authors", "collection_id": "hty58-rtt02", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160512-132249249", "type": "article", "title": "Measurement of the ratio B(B_s^0 \u2192 J/\u03c8f_0(980))/B(B_s^0 \u2192 J/\u03c8\u03d5(1020)) in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the ratio of the branching fractions of the B_s^0 meson to J/\u03c8f_0(980) and to J/\u03c8\u03d5(1020) is presented. The J/\u03c8, f_0(980), and \u03d5(1020) are observed through their decays to \u03bc^+\u03bc^\u2212, \u03c0^+\u03c0^\u2212, and K^+K^\u2212, respectively. The f_0 and the \u03d5 are identified by requiring |M\u03c0^+\u03c0^\u2212 \u2212 974 MeV|<50 MeV| and |MK^+K^\u2212 \u2212 1020 MeV|<10 MeV. The analysis is based on a data sample of pp collisions at a centre-of-mass energy of 7 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3 fb^(\u22121). The measured ratio is B(B_s^0\u2192J/\u03c8f_0)B(f_0\u2192\u03c0^+\u03c0^\u2212)/B(B_s^0\u2192J\u03c8\u03d5)B(\u03d5\u2192K^+K^\u2212)=0.140\u00b10.008(stat)\u00b10.023(syst), where the first uncertainty is statistical and the second is systematic.", "doi": "10.1016/j.physletb.2016.02.047", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-05-10", "volume": "756", "pages": "84-102" }, { "id": "authors:sn9vf-20159", "collection": "authors", "collection_id": "sn9vf-20159", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160624-141737449", "type": "article", "title": "Measurement of the top quark mass using charged particles in pp collisions at \u221as = 8\u2009\u2009 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bendavid", "given_name": "J.", "clpid": "Bendavid-J" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A novel technique for measuring the mass of the top quark that uses only the kinematic properties of its charged decay products is presented. Top quark pair events with final states with one or two charged leptons and hadronic jets are selected from the data set of 8 TeV proton-proton collisions, corresponding to an integrated luminosity of 19.7\u2009fb^(\u22121). By reconstructing secondary vertices inside the selected jets and computing the invariant mass of the system formed by the secondary vertex and an isolated lepton, an observable is constructed that is sensitive to the top quark mass that is expected to be robust against the energy scale of hadronic jets. The main theoretical systematic uncertainties, concerning the modeling of the fragmentation and hadronization of b quarks and the reconstruction of secondary vertices from the decays of b hadrons, are studied. A top quark mass of 173.68\u00b10.20(stat)^(+1.58)_(\u22120.97) (syst)\u2009\u2009GeV is measured. The overall systematic uncertainty is dominated by the uncertainty in the b quark fragmentation and the modeling of kinematic properties of the top quark.", "doi": "10.1103/PhysRevD.93.092006", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-05-01", "series_number": "9", "volume": "93", "issue": "9", "pages": "Art. No. 092006" }, { "id": "authors:6znv4-2mx87", "collection": "authors", "collection_id": "6znv4-2mx87", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160622-095227117", "type": "article", "title": "Search for supersymmetry in pp collisions at \u221as = 8 TeV in final states with boosted W bosons and b jets using razor variables", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for supersymmetry in hadronic final states with highly boosted W bosons and b jets is presented, focusing on compressed scenarios. The search is performed using proton-proton collision data at a center-of-mass energy of 8 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121). Events containing candidates for hadronic decays of boosted W bosons are identified using jet substructure techniques, and are analyzed using the razor variables M_R and R_2, which characterize a possible signal as a peak on a smoothly falling background. The observed event yields in the signal regions are found to be consistent with the expected contributions from standard model processes, which are predicted using control samples in the data. The results are interpreted in terms of gluino-pair production followed by their exclusive decay into top squarks and top quarks. The analysis excludes gluino masses up to 1.1 TeV for light top squarks decaying solely to a charm quark and a neutralino, and up to 700 GeV for heavier top squarks decaying solely to a top quark and a neutralino.", "doi": "10.1103/PhysRevD.93.092009", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-05-01", "series_number": "9", "volume": "93", "issue": "9", "pages": "Art. No. 092009" }, { "id": "authors:9dhfx-q6375", "collection": "authors", "collection_id": "9dhfx-q6375", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160622-081544354", "type": "article", "title": "Search for massive WH resonances decaying into the \u2113\u03bdbb final state at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a massive resonance W\u2032decaying into a W and a Higgs boson in the \u2113\u03bdbb (\u2113=e, \u03bc) final state is presented. Results are based on data corresponding to an integrated luminosity of 19.7fb^(\u22121) of proton\u2013proton collisions at \u221as = 8 TeV, collected using the CMS detector at the LHC. For a high-mass (\u22731 TeV) resonance, the two bottom quarks coming from the Higgs boson decay are reconstructed as a single jet, which can be tagged by placing requirements on its substructure and flavour. Exclusion limits at 95 % confidence level are set on the production cross section of a narrow resonance decaying into WH, as a function of its mass. In the context of a little Higgs model, a lower limit on the W\u2032 mass of 1.4 TeV is set. In a heavy vector triplet model that mimics the properties of composite Higgs models, a lower limit on the W\u2032 mass of 1.5 TeV is set. In the context of this model, the results are combined with related searches to obtain a lower limit on the W\u2032 mass of 1.8 TeV, the most restrictive to date for decays to a pair of standard model bosons.", "doi": "10.1140/epjc/s10052-016-4067-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-05", "series_number": "5", "volume": "76", "issue": "5", "pages": "Art. No. 237" }, { "id": "authors:vrc82-2kk33", "collection": "authors", "collection_id": "vrc82-2kk33", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160609-083233984", "type": "article", "title": "Measurement of Long-Range Near-Side Two-Particle Angular Correlations in pp Collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Results on two-particle angular correlations for charged particles produced in pp collisions at a center-of-mass energy of 13 TeV are presented. The data were taken with the CMS detector at the LHC and correspond to an integrated luminosity of about 270\u2009\u2009nb^(\u22121). The correlations are studied over a broad range of pseudorapidity (|\u03b7|<2.4) and over the full azimuth (\u03d5) as a function of charged particle multiplicity and transverse momentum (p_T). In high-multiplicity events, a long-range (|\u0394\u03b7|>2.0), near-side (\u0394\u03d5\u22480) structure emerges in the two-particle \u0394\u03b7\u2013\u0394\u03d5 correlation functions. The magnitude of the correlation exhibits a pronounced maximum in the range 1.0", "doi": "10.1103/PhysRevLett.116.172302", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2016-04-29", "series_number": "17", "volume": "116", "issue": "17", "pages": "Art. No. 172302" }, { "id": "authors:wmxz0-xyc65", "collection": "authors", "collection_id": "wmxz0-xyc65", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160624-150858797", "type": "article", "title": "Search for W\u2032 decaying to tau lepton and neutrino in proton\u2013proton collisions at \u221as = 8\u2009\u2009 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" } ], "abstract": "The first search for a heavy charged vector boson in the final state with a tau lepton and a neutrino is reported, using 19.7 fb^(\u22121) of LHC data at \u221as = 8\u2009\u2009 TeV. A signal would appear as an excess of events with high transverse mass, where the standard model background is low. No excess is observed. Limits are set on a model in which the W\u2032 decays preferentially to fermions of the third generation. These results substantially extend previous constraints on this model. Masses below 2.0 to 2.7 TeV are excluded, depending on the model parameters. In addition, the existence of a W\u2032 boson with universal fermion couplings is excluded at 95% confidence level, for W\u2032 masses below 2.7 TeV. For further reinterpretation a model-independent limit on potential signals for various transverse mass thresholds is also presented.", "doi": "10.1016/j.physletb.2016.02.002", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-04-10", "volume": "755", "pages": "196-216" }, { "id": "authors:r6vvg-4kn47", "collection": "authors", "collection_id": "r6vvg-4kn47", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160624-142248732", "type": "article", "title": "Search for new phenomena in monophoton final states in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb^(\u22121) collected in proton\u2013proton collisions at \u221as = 8 TeV with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. An upper limit of 14.0 fb on the cross section is set at the 95% confidence level for events with a monophoton final state with photon transverse momentum greater than 145 GeV and missing transverse momentum greater than 140 GeV.", "doi": "10.1016/j.physletb.2016.01.057", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-04-10", "volume": "755", "pages": "102-124" }, { "id": "authors:gfykx-rpd35", "collection": "authors", "collection_id": "gfykx-rpd35", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160627-065115760", "type": "article", "title": "Searches for a heavy scalar boson H decaying to a pair of 125 GeV Higgs bosons hh or for a heavy pseudoscalar boson A decaying to Zh, in the final states with h \u2192 \u03c4\u03c4", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a heavy scalar boson H decaying into a pair of lighter standard-model-like 125 GeV Higgs bosons hh and a search for a heavy pseudoscalar boson A decaying into a Z and an h boson are presented. The searches are performed on a data set corresponding to an integrated luminosity of 19.7 fb^(\u22121) of pp collision data at a centre-of-mass energy of 8 TeV, collected by CMS in 2012. A final state consisting of two \u03c4 leptons and two b jets is used to search for the H\u2192hh decay. A final state consisting of two \u03c4 leptons from the h boson decay, and two additional leptons from the Z boson decay, is used to search for the decay A\u2192Zh. The results are interpreted in the context of two-Higgs-doublet models. No excess is found above the standard model expectation and upper limits are set on the heavy boson production cross sections in the mass ranges 260", "doi": "10.1016/j.physletb.2016.01.056", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-04-10", "volume": "755", "pages": "217-244" }, { "id": "authors:hqh7d-8xw37", "collection": "authors", "collection_id": "hqh7d-8xw37", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160503-131810845", "type": "article", "title": "Measurement of the top quark mass using proton-proton data at \u221a(s)=7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A new set of measurements of the top quark mass are presented, based on the proton-proton data recorded by the CMS experiment at the LHC at \u221as = 8\u2009\u2009TeV corresponding to a luminosity of 19.7\u2009\u2009fb^(\u22121). The top quark mass is measured using the lepton+jets, all-jets and dilepton decay channels, giving values of 172.35\u00b10.16(stat)\u00b10.48(syst)\u2009\u2009GeV, 172.32\u00b10.25(stat)\u00b10.59(syst)\u2009\u2009GeV, and 172.82\u00b10.19(stat)\u00b11.22(syst)\u2009\u2009GeV, respectively. When combined with the published CMS results at \u221as = 7\u2009\u2009TeV, they provide a top quark mass measurement of 172.44\u00b10.13(stat)\u00b10.47(syst)\u2009\u2009GeV. The top quark mass is also studied as a function of the event kinematical properties in the lepton+jets decay channel. No indications of a kinematic bias are observed and the collision data are consistent with a range of predictions from current theoretical models of tt production.", "doi": "10.1103/PhysRevD.93.072004", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-04-01", "series_number": "7", "volume": "93", "issue": "7", "pages": "Art. No. 072004" }, { "id": "authors:59200-axf76", "collection": "authors", "collection_id": "59200-axf76", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160510-111019355", "type": "article", "title": "Search for anomalous single top quark production in association with a photon in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The result of a search for flavor changing neutral currents (FCNC) through single top quark production in association with a photon is presented. The study is based on proton-proton collisions at a center-of-mass energy of 8 TeV using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 fb^(\u22121). The search for t\u03b3 events where t \u2192 Wb and W \u2192 \u03bc\u03bd is conducted in final states with a muon, a photon, at least one hadronic jet with at most one being consistent with originating from a bottom quark, and missing transverse momentum. No evidence of single top quark production in association with a photon through a FCNC is observed. Upper limits at the 95% confidence level are set on the tu\u03b3 and tc\u03b3 anomalous couplings and translated into upper limits on the branching fraction of the FCNC top quark decays: \u212c(t\u2009\u2192\u2009u\u03b3)\u2009<\u20091.3\u2009\u00d7\u200910^(\u2212\u20094) and \u212c(t\u2009\u2192\u2009c\u03b3)\u2009<\u20091.7\u2009\u00d7\u200910^(\u2212\u20093). Upper limits are also set on the cross section of associated t\u03b3 production in a restricted phase-space region. These are the most stringent limits currently available.", "doi": "10.1007/JHEP04(2016)035", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-04", "series_number": "4", "volume": "2016", "issue": "4", "pages": "Art. No. 35" }, { "id": "authors:kfk7z-q3g41", "collection": "authors", "collection_id": "kfk7z-q3g41", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160614-082405038", "type": "article", "title": "Measurement of top quark polarisation in t-channel single top quark production", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t-channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb^(\u22121). A high-purity sample of t-channel single top quark events with an isolated muon is selected. Signal and background components are estimated using a fit to data. A differential cross section measurement, corrected for detector effects, of an angular observable sensitive to the top quark polarisation is performed. The differential distribution is used to extract a top quark spin asymmetry of 0.26 \u00b1 0.03(stat) \u00b1 0.10(syst), which is compatible with a p-value of 4.6% with the standard model prediction of 0.44.", "doi": "10.1007/JHEP04(2016)073", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-04", "series_number": "4", "volume": "2016", "issue": "4", "pages": "Art. No. 073" }, { "id": "authors:naj42-ygd09", "collection": "authors", "collection_id": "naj42-ygd09", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160513-072410223", "type": "article", "title": "Measurement of differential and integrated fiducial cross sections for Higgs boson production in the four-lepton decay channel in pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Integrated fiducial cross sections for the production of four leptons via the H \u2192 4\u2113 decays (\u2113 = e, \u03bc) are measured in pp collisions at \u221as = 7 and 8 TeV. Measurements are performed with data corresponding to integrated luminosities of 5.1 fb^(\u22121) at 7TeV, and 19.7 fb^(\u22121) at 8 TeV, collected with the CMS experiment at the LHC. Differential cross sections are measured using the 8 TeV data, and are determined as functions of the transverse momentum and rapidity of the four-lepton system, accompanying jet multiplicity, transverse momentum of the leading jet, and difference in rapidity between the Higgs boson candidate and the leading jet. A measurement of the Z \u2192 4\u2113 cross section, and its ratio to the H \u2192 4\u2113 cross section is also performed. All cross sections are measured within a fiducial phase space defined by the requirements on lepton kinematics and event topology. The integrated H \u2192 4\u2113 fiducial cross section is measured to be 0.\u200956_(\u2212\u20090.44)^(+\u20090.67) (stat)_(\u2212\u20090.06)+(+\u20090.21) (syst) fb at 7 TeV, and 1.\u200911 _(\u2212\u20090.35)^(+\u20090.41) (stat)_(\u2212\u20090.10)^(+\u20090.14) (syst) fb at 8 TeV. The measurements are found to be compatible with theoretical calculations based on the standard model.", "doi": "10.1007/JHEP04(2016)005", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-04", "series_number": "4", "volume": "2016", "issue": "4", "pages": "Art. No. 5" }, { "id": "authors:g5n6b-fh076", "collection": "authors", "collection_id": "g5n6b-fh076", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160504-134218915", "type": "article", "title": "Event generator tunes obtained from underlying event and multiparton scattering measurements", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "New sets of parameters (\"tunes\") for the underlying-event (UE) modelling of the PYTHIA8, PYTHIA6 and HERWIG++ Monte Carlo event generators are constructed using different parton distribution functions. Combined fits to CMS UE proton\u2013proton (pp) data at \u221as = 7 TeV and to UE proton\u2013antiproton (pp) data from the CDF experiment at lower \u221as, are used to study the UE models and constrain their parameters, providing thereby improved predictions for proton\u2013proton collisions at 13TeV. In addition, it is investigated whether the values of the parameters obtained from fits to UE observables are consistent with the values determined from fitting observables sensitive to double-parton scattering processes. Finally, comparisons are presented of the UE tunes to \"minimum bias\" (MB) events, multijet, and Drell\u2013Yan (qq \u2192 Z/\u03b3^\u2217 \u2192 lepton-antilepton+jets) observables at 7 and 8 TeV, as well as predictions for MB and UE observables at 13TeV.", "doi": "10.1140/epjc/s10052-016-3988-x", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-03-17", "series_number": "3", "volume": "76", "issue": "3", "pages": "Art. No. 155" }, { "id": "authors:svgpr-6ph88", "collection": "authors", "collection_id": "svgpr-6ph88", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160401-080656780", "type": "article", "title": "Transverse momentum spectra of inclusive b jets in pPb collisions at \u221asNN = 5.02 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "We present a measurement of b jet transverse momentum (p_T) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35 nb^(\u22121) collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon\u2013nucleon collisions and are compared to a reference obtained from pythia simulations of pp collisions. The pythia-based estimate of the nuclear modification factor is found to be 1.22\u00b10.15(stat+syst pPb)\u00b10.27(syst PYTHIA) averaged over all jets with p_T between 55 and c400 GeV/c and with |\u03b7_(lab)|<2. We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics.", "doi": "10.1016/j.physletb.2016.01.010", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-03-10", "volume": "754", "pages": "59-80" }, { "id": "authors:9rd92-kmb93", "collection": "authors", "collection_id": "9rd92-kmb93", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160411-080712515", "type": "article", "title": "Measurements of tt spin correlations and top quark polarization using dilepton final states in pp collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the top quark-antiquark (tt) spin correlations and the top quark polarization are presented for tt pairs produced in pp collisions at \u221as = 8\u2009\u2009TeV. The data correspond to an integrated luminosity of 19.5\u2009\u2009fb^(\u22121) collected with the CMS detector at the LHC. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The spin correlations and polarization are measured from the angular distributions of the two selected leptons, both inclusively and differentially, with respect to the invariant mass, rapidity, and transverse momentum of the tt system. The measurements are unfolded to the parton level and found to be in agreement with predictions of the standard model. A search for new physics in the form of anomalous top quark chromo moments is performed. No evidence of new physics is observed, and exclusion limits on the real part of the chromo-magnetic dipole moment and the imaginary part of the chromo-electric dipole moment are evaluated.", "doi": "10.1103/PhysRevD.93.052007", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-03-09", "series_number": "5", "volume": "93", "issue": "5", "pages": "Art. No. 052007" }, { "id": "authors:6jwe9-nzs29", "collection": "authors", "collection_id": "6jwe9-nzs29", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160504-112512646", "type": "article", "title": "Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for evidence of particle dark matter (DM) and unparticle production at the LHC has been performed using events containing two charged leptons, consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector corresponding to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121) of pp collisions at the LHC at a center-of-mass energy of 8 TeV. No significant excess of events is observed above the number expected from the standard model contributions. The results are interpreted in terms of 90% confidence level limits on the DM-nucleon scattering cross section, as a function of the DM particle mass, for both spin-dependent and spin-independent scenarios. Limits are set on the effective cutoff scale \u039b, and on the annihilation rate for DM particles, assuming that their branching fraction to quarks is 100%. Additionally, the most stringent 95% confidence level limits to date on the unparticle model parameters are obtained.", "doi": "10.1103/PhysRevD.93.052011", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-03-01", "series_number": "5", "volume": "93", "issue": "5", "pages": "Art. No. 052011" }, { "id": "authors:52kw2-6g961", "collection": "authors", "collection_id": "52kw2-6g961", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160512-151537720", "type": "article", "title": "Search for excited leptons in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for compositeness of electrons and muons is presented using a data sample of proton-proton collisions at a center-of-mass energy of \u221as=8 TeV collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 19.7 fb^(\u22121). Excited leptons (\u2113^*) produced via contact interactions in conjunction with a standard model lepton are considered, and a search is made for their gauge decay modes. The decays considered are \u2113^* \u2192 \u2113\u03b3 and \u2113^* \u2192 \u2113Z, which give final states of two leptons and a photon or, depending on the Z-boson decay mode, four leptons or two leptons and two jets. The number of events observed in data is consistent with the standard model prediction. Exclusion limits are set on the excited lepton mass, and the compositeness scale \u039b. For the case M_(\u2113*) = \u039b the existence of excited electrons (muons) is excluded up to masses of 2.45 (2.47) TeV at 95% confidence level. Neutral current decays of excited leptons are considered for the first time, and limits are extended to include the possibility that the weight factors f and f\u2032, which determine the couplings between standard model leptons and excited leptons via gauge mediated interactions, have opposite sign.", "doi": "10.1007/JHEP03(2016)125", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-03", "series_number": "3", "volume": "2016", "issue": "3", "pages": "Art. No. 125" }, { "id": "authors:3ascf-y5237", "collection": "authors", "collection_id": "3ascf-y5237", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160615-073018533", "type": "article", "title": "Measurement of the tt production cross section in the all-jets final state in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The cross section for tt production in the all-jets final state is measured in pp collisions at a centre-of-mass energy of 8 TeV at the LHC with the CMS detector, in data corresponding to an integrated luminosity of 18.4 fb^(\u22121). The inclusive cross section is found to be 275.6 \u00b1 6.1(stat) \u00b1 37.8(syst) \u00b1 7.2(lumi) pb. The normalized differential cross sections are measured as a function of the top quark transverse momenta, p_T, and compared to predictions from quantum chromodynamics. The results are reported at detector, parton, and particle levels. In all cases, the measured top quark p_T spectra are significantly softer than theoretical predictions.", "doi": "10.1140/epjc/s10052-016-3956-5", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-03", "series_number": "3", "volume": "76", "issue": "3", "pages": "Art. No. 128" }, { "id": "authors:x8e0y-54579", "collection": "authors", "collection_id": "x8e0y-54579", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160318-144021560", "type": "article", "title": "Search for single production of scalar leptoquarks in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for the production of both first- and second-generation scalar leptoquarks with a final state of either two electrons and one jet or two muons and one jet. The search is based on a data sample of proton-proton collisions at center-of-mass energy s\u221a=8\u2009\u2009TeV recorded with the CMS detector and corresponding to an integrated luminosity of 19.6\u2009\u2009fb^\u22121. Upper limits are set on both the first- and second-generation leptoquark production cross sections as functions of the leptoquark mass and the leptoquark couplings to a lepton and a quark. Results are compared with theoretical predictions to obtain lower limits on the leptoquark mass. At 95% confidence level, single production of first-generation leptoquarks with a coupling and branching fraction of 1.0 is excluded for masses below 1730 GeV, and second-generation leptoquarks with a coupling and branching fraction of 1.0 is excluded for masses below 530 GeV. These are the best overall limits on the production of first-generation leptoquarks to date.", "doi": "10.1103/PhysRevD.93.032005", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-02-24", "series_number": "3", "volume": "93", "issue": "3", "pages": "ARt. No. 032005" }, { "id": "authors:bgn0k-vev50", "collection": "authors", "collection_id": "bgn0k-vev50", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160316-121111354", "type": "article", "title": "Search for Narrow Resonances Decaying to Dijets in Proton-Proton Collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Yanbei", "orcid": "0000-0002-9730-9463", "clpid": "Chen-Yanbei" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for narrow resonances in proton-proton collisions at \u221as = 13\u2009\u2009TeV is presented. The invariant mass distribution of the two leading jets is measured with the CMS detector using a data set corresponding to an integrated luminosity of 2.4\u2009\u2009fb^(\u22121). The highest observed dijet mass is 6.1 TeV. The distribution is smooth and no evidence for resonant particles is observed. Upper limits at 95% confidence level are set on the production cross section for narrow resonances with masses above 1.5 TeV. When interpreted in the context of specific models, the limits exclude string resonances with masses below 7.0 TeV, scalar diquarks below 6.0 TeV, axigluons and colorons below 5.1 TeV, excited quarks below 5.0 TeV, color-octet scalars below 3.1 TeV, and W\u2032 bosons below 2.6 TeV. These results significantly extend previously published limits.", "doi": "10.1103/PhysRevLett.116.071801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2016-02-19", "series_number": "7", "volume": "116", "issue": "7", "pages": "Art. No. 071801" }, { "id": "authors:648cy-1qw62", "collection": "authors", "collection_id": "648cy-1qw62", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160321-094624139", "type": "article", "title": "Measurement of the charge asymmetry in top quark pair production in pp collisions at \u221as = 8 TeV using a template method", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The charge asymmetry in the production of top quark and antiquark pairs is measured in proton-proton collisions at a center-of-mass energy of 8 TeV. The data, corresponding to an integrated luminosity of 19.6\u2009\u2009fb^(\u22121), were collected by the CMS experiment at the LHC. Events with a single isolated electron or muon, and four or more jets, at least one of which is likely to have originated from hadronization of a bottom quark, are selected. A template technique is used to measure the asymmetry in the distribution of differences in the top quark and antiquark absolute rapidities. The measured asymmetry is A^y_c=[0.33\u00b10.26(stat)\u00b10.33(syst)]%, which is the most precise result to date. The results are compared to calculations based on the standard model and on several beyond-the-standard-model scenarios.", "doi": "10.1103/PhysRevD.93.034014", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-02-18", "series_number": "3", "volume": "93", "issue": "3", "pages": "Art. No. 034014" }, { "id": "authors:274wf-pzx61", "collection": "authors", "collection_id": "274wf-pzx61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160304-081738119", "type": "article", "title": "Angular analysis of the decay B^0 \u2192 K^(*0)\u03bc^+\u03bc^\u2212 from pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The angular distributions and the differential branching fraction of the decay B^0\u2192K^\u2217(892)^0\u03bc^+\u03bc^\u2212 are studied using data corresponding to an integrated luminosity of 20.5fb^(\u22121) collected with the CMS detector at the LHC in pp collisions at \u221as=8 TeV. From 1430 signal decays, the forward\u2013backward asymmetry of the muons, the K^\u2217(892)^0 longitudinal polarization fraction, and the differential branching fraction are determined as a function of the dimuon invariant mass squared. The measurements are among the most precise to date and are in good agreement with standard model predictions.", "doi": "10.1016/j.physletb.2015.12.020", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-02-10", "volume": "753", "pages": "424-448" }, { "id": "authors:qk7hz-pzk94", "collection": "authors", "collection_id": "qk7hz-pzk94", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160304-073418204", "type": "article", "title": "Search for exotic decays of a Higgs boson into undetectable particles and one or more photons", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for exotic decays of a Higgs boson into undetectable particles and one or two isolated photons in pp collisions at a center-of-mass energy of 8 TeV. The data correspond to an integrated luminosity of up to 19.4 fb^(\u22121) collected with the CMS detector at the LHC. Higgs bosons produced in gluon\u2013gluon fusion and in association with a Z boson are investigated, using models in which the Higgs boson decays into a gravitino and a neutralino or a pair of neutralinos, followed by the decay of the neutralino to a gravitino and a photon. The selected events are consistent with the background-only hypothesis, and limits are placed on the product of cross sections and branching fractions. Assuming a standard model Higgs boson production cross section, a 95% confidence level upper limit is set on the branching fraction of a 125 GeV Higgs boson decaying into undetectable particles and one or two isolated photons as a function of the neutralino mass. For this class of models and neutralino masses from 1 to 120 GeV an upper limit in the range of 7 to 13% is obtained. Further results are given as a function of the neutralino lifetime, and also for a range of Higgs boson masses.", "doi": "10.1016/j.physletb.2015.12.017", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-02-10", "volume": "753", "pages": "363-388" }, { "id": "authors:09p88-21a50", "collection": "authors", "collection_id": "09p88-21a50", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160304-084830940", "type": "article", "title": "Search for a Higgs boson decaying into \u03b3^*\u03b3 \u2192 \u2113\u2113\u03b3 with low dilepton mass in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to a muon or an electron pair (\u2113\u2113\u03b3). The analysis is performed using proton\u2013proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb^(\u22121). The events selected have an opposite-sign muon or electron pair and a high transverse momentum photon. No excess above background has been found in the three-body invariant mass range 120 < m_(\u2113\u2113\u03b3) < 150 GeV, and limits have been derived for the Higgs boson production cross section times branching fraction for the decay H \u2192 \u03b3*\u03b3 \u2192 \u2113\u2113\u03b3, where the dilepton invariant mass is less than 20 GeV. For a Higgs boson with mH=125 GeV, a 95% confidence level (CL) exclusion observed (expected) limit is 6.7 (5.9_(\u22121.8)^(+2.8)) times the standard model prediction. Additionally, an upper limit at 95% CL on the branching fraction of H \u2192 (J/\u03c8)\u03b3 for the 125 GeV Higgs boson is set at 1.5\u00d710^(\u22123).", "doi": "10.1016/j.physletb.2015.12.039", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-02-10", "volume": "753", "pages": "341-362" }, { "id": "authors:n3g3f-wja96", "collection": "authors", "collection_id": "n3g3f-wja96", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160301-124444662", "type": "article", "title": "Measurement of the Top Quark Pair Production Cross Section in Proton-Proton Collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The top quark pair production cross section is measured for the first time in proton-proton collisions at \u221as = 13\u2009\u2009TeV by the CMS experiment at the CERN LHC, using data corresponding to an integrated luminosity of 43\u2009\u2009pb^(\u22121). The measurement is performed by analyzing events with at least one electron and one muon of opposite charge, and at least two jets. The measured cross section is 746\u00b158(stat)\u00b153(syst)\u00b136(lumi)\u2009\u2009pb, in agreement with the expectation from the standard model.", "doi": "10.1103/PhysRevLett.116.052002", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2016-02-05", "series_number": "5", "volume": "116", "issue": "5", "pages": "Art. No. 052002" }, { "id": "authors:k6vx5-fhd14", "collection": "authors", "collection_id": "k6vx5-fhd14", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160318-111355570", "type": "article", "title": "Search for pair production of first and second generation leptoquarks in proton-proton collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair production of first and second generation leptoquarks is performed in final states containing either two charged leptons and two jets, or one charged lepton, one neutrino and two jets, using proton-proton collision data at \u221as = 8\u2009\u2009TeV. The data, corresponding to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121), were recorded with the CMS detector at the LHC. First-generation scalar leptoquarks with masses less than 1010 (850) GeV are excluded for \u03b2=1.0\u2009(0.5), where \u03b2 is the branching fraction of a leptoquark decaying to a charged lepton and a quark. Similarly, second-generation scalar leptoquarks with masses less than 1080 (760) GeV are excluded for \u03b2=1.0\u2009(0.5). Mass limits are also set for vector leptoquark production scenarios with anomalous vector couplings, and for R-parity violating supersymmetric scenarios of top squark pair production resulting in similar final-state signatures. These are the most stringent limits placed on the masses of vector leptoquarks and RPV top squarks to date.", "doi": "10.1103/PhysRevD.93.032004", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-02-01", "series_number": "3", "volume": "93", "issue": "3", "pages": "Art. No. 032004" }, { "id": "authors:2d1bk-64t23", "collection": "authors", "collection_id": "2d1bk-64t23", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160608-140148122", "type": "article", "title": "Search for a massive resonance decaying into a Higgs boson and a W or Z boson in hadronic final states in proton-proton collisions at \u221as=8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a massive resonance decaying into a standard-model-like Higgs boson (H) and a W or Z boson is reported. The analysis is performed on a data sample corresponding to an integrated luminosity of 19.7 fb^(\u22121), collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. Signal events, in which the decay products of Higgs, W, or Z bosons at high Lorentz boost are contained within single reconstructed jets, are identified using jet substructure techniques, including the tagging of b hadrons. This is the first search for heavy resonances decaying into HW or HZ resulting in an all-jet final state, as well as the first application of jet substructure techniques to identify H \u2192 WW* \u2192 4q decays at high Lorentz boost. No significant signal is observed and limits are set at 95% confidence level on the production cross sections of W\u2032 and Z\u2032 in a model with mass-degenerate charged and neutral spin-1 resonances. Resonance masses are excluded for W\u2032 in the interval [1.0, 1.6] TeV, for Z\u2032 in the intervals [1.0, 1.1] and [1.3, 1.5] TeV, and for mass-degenerate W\u2032 and Z\u2032 in the interval [1.0, 1.7] TeV.", "doi": "10.1007/JHEP02(2016)145", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-02", "series_number": "2", "volume": "2016", "issue": "2", "pages": "Art. No. 145" }, { "id": "authors:mvmhx-wt290", "collection": "authors", "collection_id": "mvmhx-wt290", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160606-142535044", "type": "article", "title": "Search for W\u2032 \u2192 tb in proton-proton collisions at \u221as=8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for the production of a massive W\u2032 boson decaying to a top and a bottom quark. The data analysed correspond to an integrated luminosity of 19.7 fb^(\u22121) collected with the CMS detector at the LHC in proton-proton collisions at \u221as =8 TeV. The hadronic decay products of the top quark with high Lorentz boost from the W\u2032 boson decay are detected as a single top flavoured jet. The use of jet substructure algorithms allows the top quark jet to be distinguished from standard model QCD background. Limits on the production cross section of a right-handed W\u2032 boson are obtained, together with constraints on the left-handed and right-handed couplings of the W\u2032 boson to quarks. The production of a right-handed W\u2032 boson with a mass below 2.02 TeV decaying to a hadronic final state is excluded at 95% confidence level. This mass limit increases to 2.15 TeV when both hadronic and leptonic decays are considered, and is the most stringent lower mass limit to date in the tb decay mode.", "doi": "10.1007/JHEP02(2016)122", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-02", "series_number": "2", "volume": "2016", "issue": "2", "pages": "Art. No. 122" }, { "id": "authors:3ve6j-b5g42", "collection": "authors", "collection_id": "3ve6j-b5g42", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160613-154957919", "type": "article", "title": "Correlations between jets and charged particles in PbPb and pp collisions at \u221as_(NN) = 2.76 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The quark-gluon plasma is studied via medium-induced changes to correlations between jets and charged particles in PbPb collisions compared to pp reference data. This analysis uses data sets from PbPb and pp collisions with integrated luminosities of 166 \u03bcb^(\u22121) and 5.3 pb^(\u22121), respectively, collected at \u221as_(NN) = 2.76 TeV. The angular distributions of charged particles are studied as a function of relative pseudorapidity (\u0394\u03b7) and relative azimuthal angle (\u0394\u03d5) with respect to reconstructed jet directions. Charged particles are correlated with all jets with transverse momentum (p_T) above 120 GeV, and with the leading and subleading jets (the highest and second-highest in p_T, respectively) in a selection of back-to-back dijet events. Modifications in PbPb data relative to pp reference data are characterized as a function of PbPb collision centrality and charged particle p_T. A centrality-dependent excess of low-p_T particles is present for all jets studied, and is most pronounced in the most central events. This excess of low-p_T particles follows a Gaussian-like distribution around the jet axis, and extends to large relative angles of \u0394\u03b7 \u2248 1 and \u0394\u03d5 \u2248 1.", "doi": "10.1007/JHEP02(2016)156", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-02", "series_number": "2", "volume": "2016", "issue": "2", "pages": "Art. No. 156" }, { "id": "authors:7w7r7-7ww41", "collection": "authors", "collection_id": "7w7r7-7ww41", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160219-075947409", "type": "article", "title": "Study of B Meson Production in p + Pb Collisions at \u221asNN = 5.02\u2009\u2009TeV Using Exclusive Hadronic Decays", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The production cross sections of the B^+, B^0, and B^0_s mesons, and of their charge conjugates, are measured via exclusive hadronic decays in p+Pb collisions at the center-of-mass energy \u221asNN = 5.02\u2009\u2009TeV with the CMS detector at the CERN LHC. The data set used for this analysis corresponds to an integrated luminosity of 34.6\u2009\u2009nb^(\u22121). The production cross sections are measured in the transverse momentum range between 10 and 60\u2009\u2009GeV/c. No significant modification is observed compared to proton-proton perturbative QCD calculations scaled by the number of incoherent nucleon-nucleon collisions. These results provide a baseline for the study of in-medium b quark energy loss in Pb+Pb collisions.", "doi": "10.1103/PhysRevLett.116.032301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2016-01-22", "series_number": "3", "volume": "116", "issue": "3", "pages": "Art. No. 032301" }, { "id": "authors:k4xag-xse61", "collection": "authors", "collection_id": "k4xag-xse61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160401-105512156", "type": "article", "title": "Reconstruction and identification of \u03c4 lepton decays to hadrons and \u03bd_\u03c4 at CMS", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper describes the algorithms used by the CMS experiment to reconstruct and identify \u03c4 \u2192 hadrons + \u03bd_\u03c4 decays during Run 1 of the LHC. The performance of the algorithms is studied in proton-proton collisions recorded at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb^(\u22121). The algorithms achieve an identification efficiency of 50\u201360%, with misidentification rates for quark and gluon jets, electrons, and muons between per mille and per cent levels.", "doi": "10.1088/1748-0221/11/01/P01019", "issn": "1748-0221", "publisher": "IOP Publishing", "publication": "Journal of Instrumentation", "publication_date": "2016-01-16", "series_number": "1", "volume": "11", "issue": "1", "pages": "Art. No. P01019" }, { "id": "authors:65jsx-zrs26", "collection": "authors", "collection_id": "65jsx-zrs26", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160208-144127927", "type": "article", "title": "A search for pair production of new light bosons decaying into muons", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the pair production of new light bosons, each decaying into a pair of muons, is performed with the CMS experiment at the LHC, using a dataset corresponding to an integrated luminosity of 20.7 fb^(\u22121) collected in proton\u2013proton collisions at center-of-mass energy of \u221as = 8 TeV. No excess is observed in the data relative to standard model background expectation and a model independent upper limit on the product of the cross section, branching fraction, and acceptance is derived. The results are compared with two benchmark models, the first one in the context of the next-to-minimal supersymmetric standard model, and the second one in scenarios containing a hidden sector, including those predicting a nonnegligible light boson lifetime.", "doi": "10.1016/j.physletb.2015.10.067", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-01-10", "series_number": "1", "volume": "752", "issue": "1", "pages": "146-168" }, { "id": "authors:991bn-64v76", "collection": "authors", "collection_id": "991bn-64v76", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160210-104050776", "type": "article", "title": "Search for neutral MSSM Higgs bosons decaying to \u03bc^+\u03bc^\u2212 in pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for neutral Higgs bosons predicted in the minimal supersymmetric standard model (MSSM) for \u03bc^+\u03bc^\u2212 decay channels is presented. The analysis uses data collected by the CMS experiment at the LHC in proton\u2013proton collisions at centre-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 5.1 and 19.3 fb^(\u22121), respectively. The search is sensitive to Higgs bosons produced either through the gluon fusion process or in association with a bb quark pair. No statistically significant excess is observed in the \u03bc^+\u03bc^\u2212 mass spectrum. Results are interpreted in the framework of several benchmark scenarios, and the data are used to set an upper limit on the MSSM parameter tan\u2061 \u03b2 as a function of the mass of the pseudoscalar A boson in the range from 115 to 300 GeV. Model independent upper limits are given for the product of the cross section and branching fraction for gluon fusion and b quark associated production at \u221as = 8 TeV. They are the most stringent limits obtained to date in this channel.", "doi": "10.1016/j.physletb.2015.11.042", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2016-01-10", "volume": "752", "pages": "221-246" }, { "id": "authors:1p68j-bsj13", "collection": "authors", "collection_id": "1p68j-bsj13", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160201-131638223", "type": "article", "title": "Search for resonant tt production in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for the production of heavy resonances decaying into top-antitop quark pairs in proton-proton collisions at \u221as = 8\u2009\u2009TeV. Data used for the analyses were collected with the CMS detector and correspond to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121). The search is performed using events with three different final states, defined by the number of leptons (electrons and muons) from the tt \u2192 WbWb decay. The analyses are optimized for reconstruction of top quarks with high Lorentz boosts, where jet substructure techniques are used to enhance the sensitivity. Results are presented for all channels and a combination is performed. No significant excess of events relative to the expected yield from standard model processes is observed. Upper limits on the production cross section of heavy resonances decaying to tt are calculated. A narrow leptophobic topcolor Z\u2032 resonance with a mass below 2.4 TeV is excluded at 95% confidence level. Limits are also derived for a broad Z\u2032 resonance with a 10% width relative to the resonance mass, and a Kaluza-Klein excitation of the gluon in the Randall-Sundrum model. These are the most stringent limits to date on heavy resonances decaying into top-antitop quark pairs.", "doi": "10.1103/PhysRevD.93.012001", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-01-01", "series_number": "1", "volume": "93", "issue": "1", "pages": "Art. No. 012001" }, { "id": "authors:4266f-nq786", "collection": "authors", "collection_id": "4266f-nq786", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160219-083924120", "type": "article", "title": "Search for vectorlike charge 2/3\u2009T quarks in proton-proton collisions at \u221a(s)=8\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for fermionic top quark partners T of charge 2/3 is presented. The search is carried out in proton-proton collisions corresponding to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121) collected at a center-of-mass energy of \u221as=8\u2009\u2009TeV with the CMS detector at the LHC. The T quarks are assumed to be produced strongly in pairs and can decay into tH, tZ, and bW. The search is performed in five exclusive channels: a single-lepton channel, a multilepton channel, two all-hadronic channels optimized either for the bW or the tH decay, and one channel in which the Higgs boson decays into two photons. The results are found to be compatible with the standard model expectations in all the investigated final states. A statistical combination of these results is performed and lower limits on the T quark mass are set. Depending on the branching fractions, lower mass limits between 720 and 920 GeV at 95% confidence level are found. These are among the strongest limits on vectorlike T quarks obtained to date.", "doi": "10.1103/PhysRevD.93.012003", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2016-01-01", "series_number": "1", "volume": "93", "issue": "1", "pages": "Art. No. 012003" }, { "id": "authors:ahj7z-n3785", "collection": "authors", "collection_id": "ahj7z-n3785", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160219-090440006", "type": "article", "title": "Search for a very light NMSSM Higgs boson produced in decays of the 125 GeV scalar boson and decaying into \u03c4 leptons in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a very light Higgs boson decaying into a pair of \u03c4 leptons is presented within the framework of the next-to-minimal supersymmetric standard model. This search is based on a data set corresponding to an integrated luminosity of 19.7 fb^(\u22121) of proton-proton collisions collected by the CMS experiment at a centre-of-mass energy of 8 TeV. The signal is defined by the production of either of the two lightest scalars, h_1 or h_2, via gluon-gluon fusion and subsequent decay into a pair of the lightest Higgs bosons, a_1 or h_1. The h_1 or h_2 boson is identified with the observed state at a mass of 125 GeV. The analysis searches for decays of the a_1 (h_1) states into pairs of \u03c4 leptons and covers a mass range for the a_1 (h_1) boson of 4 to 8 GeV. The search reveals no significant excess in data above standard model background expectations, and an upper limit is set on the signal production cross section times branching fraction as a function of the a_1 (h_1) boson mass. The 95% confidence level limit ranges from 4.5 pb at m_(a_1) (m_(h_1))=8| GeV to 10.3 pb at m_(a_1)| (m_(h_1))=5| GeV.", "doi": "10.1007/JHEP01(2016)079", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-01", "series_number": "01", "volume": "2016", "issue": "01", "pages": "Art. No. 079" }, { "id": "authors:pkk1p-6fk86", "collection": "authors", "collection_id": "pkk1p-6fk86", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160304-093222261", "type": "article", "title": "Search for the production of an excited bottom quark decaying to tW in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for a singly produced excited bottom quark (b*) decaying to a top quark and a W boson in the all-hadronic, lepton+jets, and dilepton final states in proton-proton collisions at \u221as=8s=8 TeV recorded by the CMS experiment at the CERN LHC. Data corresponding to an integrated luminosity of 19.7 fb^(\u22121) are used. No significant excess of events is observed with respect to standard model expectations. We set limits at 95% confidence on the product of the b* quark production cross section and its branching fraction to tW. The cross section limits are interpreted for scenarios including left-handed, right-handed, and vector-like couplings of the b* quark and are presented in the two-dimensional coupling plane based on the production and decay coupling constants. The masses of the left-handed, right-handed, and vector-like b* quark states are excluded at 95% confidence below 1390, 1430, and 1530 GeV, respectively, for benchmark couplings. This analysis gives the most stringent limits on the mass of the b\u2217 quark to date.", "doi": "10.1007/JHEP01(2016)166", "issn": "1029-8479", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-01", "series_number": "1", "volume": "2016", "issue": "1", "pages": "Art. No. 166" }, { "id": "authors:cf445-spv69", "collection": "authors", "collection_id": "cf445-spv69", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160315-070019368", "type": "article", "title": "Observation of top quark pairs produced in association with a vector boson in pp collisions \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb^(\u22121), collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from ttW or ttZ decays. The ttW cross section is measured to be 382_(\u2212\u2009102)^(+\u2009117) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The ttZ cross section is measured to be 242_(\u2212\u200955)^(+\u200965) fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the ttW and ttZ cross sections.", "doi": "10.1007/JHEP01(2016)096", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-01", "series_number": "1", "volume": "2016", "issue": "1", "pages": "Art. No. 96" }, { "id": "authors:qwv7s-f7152", "collection": "authors", "collection_id": "qwv7s-f7152", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160209-144317345", "type": "article", "title": "Measurement of differential cross sections for Higgs boson production in the diphoton decay channel in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of differential cross sections for Higgs boson (H) production in pp collisions at \u221as = 8 TeV. The analysis exploits the H\u2192\u03b3\u03b3 decay in data corresponding to an integrated luminosity of 19.7fb^(-1) collected by the CMS experiment at the LHC. The cross section is measured as a function of the kinematic properties of the diphoton system and of the associated jets. Results corrected for detector effects are compared with predictions at next-to-leading order and next-to-next-to-leading order in perturbative quantum chromodynamics, as well as with predictions beyond the standard model. For isolated photons with pseudorapidities |\u03b7|<2.5, and with the photon of largest and next-to-largest transverse momentum (p\u03b3T) divided by the diphoton mass m\u03b3\u03b3 satisfying the respective conditions of p^\u03b3_T/m_(\u03b3\u03b3)>1/3 and >1/4, the total fiducial cross section is 32\u00b110\\,fb.", "doi": "10.1140/epjc/s10052-015-3853-3", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2016-01", "series_number": "1", "volume": "76", "issue": "1", "pages": "Art. No. 13" }, { "id": "authors:e61a6-ta667", "collection": "authors", "collection_id": "e61a6-ta667", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160315-083149636", "type": "article", "title": "Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions \u221asNN = 2.76 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "An analysis of dijet events in PbPb and pp collisions is performed to explore the properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of transverse momentum (p_T) surrounding dijet systems is measured by selecting charged particles in different ranges of p_T and at different angular cones of pseudorapidity and azimuth. The measurement is performed as a function of centrality of the PbPb collisions, the p_T asymmetry of the jets in the dijet pair, and the distance parameter R used in the anti-k_T jet clustering algorithm. In events with unbalanced dijets, PbPb collisions show an enhanced multiplicity in the hemisphere of the subleading jet, with the p_T imbalance compensated by an excess of low-p_T particles at large angles from the jet axes.", "doi": "10.1007/JHEP01(2016)006", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2016-01", "series_number": "1", "volume": "2016", "issue": "1", "pages": "Art. No. 6" }, { "id": "authors:aj8az-mcq92", "collection": "authors", "collection_id": "aj8az-mcq92", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151221-091321595", "type": "article", "title": "Pseudorapidity distribution of charged hadrons in proton\u2013proton collisions at \u221as = 13 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The pseudorapidity distribution of charged hadrons in pp collisions at \u221as=13 TeV is measured using a data sample obtained with the CMS detector, operated at zero magnetic field, at the CERN LHC. The yield of primary charged long-lived hadrons produced in inelastic pp collisions is determined in the central region of the CMS pixel detector (|\u03b7|<2|\u03b7|<2) using both hit pairs and reconstructed tracks. For central pseudorapidities (|\u03b7|<0.5, the charged-hadron multiplicity density is dN_(ch)/d\u03b7|_(|\u03b7|) <0.5 = 5.49\u00b10.01(stat)\u00b10.17(syst), a value obtained by combining the two methods. The result is compared to predictions from Monte Carlo event generators and to similar measurements made at lower collision energies.", "doi": "10.1016/j.physletb.2015.10.004", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-12-17", "volume": "751", "pages": "143-163" }, { "id": "authors:qfyh6-sks23", "collection": "authors", "collection_id": "qfyh6-sks23", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160107-075205654", "type": "article", "title": "Production of leading charged particles and leading charged-particle jets at small transverse momenta in pp collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The per-event yield of the highest transverse momentum charged particle and charged-particle jet, integrated above a given p^(min)_T threshold starting at p^(min)_T = 0.8 and 1 GeV, respectively, is studied in pp collisions at \u221as = 8\u2009\u2009TeV. The particles and the jets are measured in the pseudorapidity ranges |\u03b7|<2.4 and 1.9, respectively. The data are sensitive to the momentum scale at which parton densities saturate in the proton, to multiple partonic interactions, and to other key aspects of the transition between the soft and hard QCD regimes in hadronic collisions.", "doi": "10.1103/PhysRevD.92.112001", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-12-01", "series_number": "11", "volume": "92", "issue": "11", "pages": "Art. No. 112001" }, { "id": "authors:1612f-mqb74", "collection": "authors", "collection_id": "1612f-mqb74", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151223-072357674", "type": "article", "title": "Search for neutral MSSM Higgs bosons decaying into a pair of bottom quarks", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for neutral Higgs bosons decaying into a bb quark pair and produced in association with at least one additional b quark is presented. This signature is sensitive to the Higgs sector of the minimal supersymmetric standard model (MSSM) with large values of the parameter tan \u03b2. The analysis is based on data from proton-proton collisions at a center-of-mass energy of 8 TeV collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.7 fb^(\u22121). The results are combined with a previous analysis based on 7 TeV data. No signal is observed. Stringent upper limits on the cross section times branching fraction are derived for Higgs bosons with masses up to 900 GeV, and the results are interpreted within different MSSM benchmark scenarios, m_h^(max), m_h^(mod\u2009+), m_h^(mod\u2009\u2212), light-stau and light-stop. Observed 95% confidence level upper limits on tan \u03b2, ranging from 14 to 50, are obtained in the m_h^(mod+) benchmark scenario.", "doi": "10.1007/JHEP11(2015)071", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-11-15", "series_number": "11", "volume": "2015", "issue": "11", "pages": "Art. No. 071" }, { "id": "authors:txegh-w2h34", "collection": "authors", "collection_id": "txegh-w2h34", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151221-142734981", "type": "article", "title": "Search for diphoton resonances in the mass range from 150 to 850 GeV in pp collisions at \u221as=8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented of a search for heavy particles decaying into two photons. The analysis is based on a 19.7fb^(\u22121) sample of proton\u2013proton collisions at \u221as = 8 TeV collected with the CMS detector at the CERN LHC. The diphoton mass spectrum from 150 to 850 GeV is used to search for an excess of events over the background. The search is extended to new resonances with natural widths of up to 10% of the mass value. No evidence for new particle production is observed and limits at 95% confidence level on the production cross section times branching fraction to diphotons are determined. These limits are interpreted in terms of two-Higgs-doublet model parameters.", "doi": "10.1016/j.physletb.2015.09.062", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-11-12", "volume": "750", "pages": "494-519" }, { "id": "authors:rrb31-ese78", "collection": "authors", "collection_id": "rrb31-ese78", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151217-103450899", "type": "article", "title": "Angular coefficients of Z bosons produced in pp collisions at \u221as = 8 TeV and decaying to \u03bc^+\u03bc^\u2212as a function of transverse momentum and rapidity", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the five most significant angular coefficients, A_0 through A_4, for Z bosons produced in pp collisions at \u221as = 8 TeV and decaying to \u03bc^+\u03bc^\u2212 are presented as a function of the transverse momentum and rapidity of the Z boson. The integrated luminosity of the dataset collected with the CMS detector at the LHC corresponds to 19.7 fb^(\u22121). These measurements provide comprehensive information about the Z boson production mechanisms, and are compared to the QCD predictions at leading order, next-to-leading order, and next-to-next-to-leading order in perturbation theory.", "doi": "10.1016/j.physletb.2015.08.061", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-11-12", "volume": "750", "pages": "154-175" }, { "id": "authors:2q64r-dbg11", "collection": "authors", "collection_id": "2q64r-dbg11", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151221-151723557", "type": "article", "title": "Study of W boson production in pPb collisions at \u221asNN = 5.02 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" } ], "abstract": "The first study of W boson production in pPb collisions is presented, for bosons decaying to a muon or electron, and a neutrino. The measurements are based on a data sample corresponding to an integrated luminosity of 34.6 nb^(\u22121) at a nucleon\u2013nucleon centre-of-mass energy of \u221asNN = 5.02 TeV, collected by the CMS experiment. The W boson differential cross sections, lepton charge asymmetry, and forward\u2013backward asymmetries are measured for leptons of transverse momentum exceeding 25 GeV/c, and as a function of the lepton pseudorapidity in the |\u03b7lab|<2.4 range. Deviations from the expectations based on currently available parton distribution functions are observed, showing the need for including W boson data in nuclear parton distribution global fits.", "doi": "10.48550/arXiv.1503.05825", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-11-10", "volume": "750", "pages": "565-586" }, { "id": "authors:60mwy-kqc90", "collection": "authors", "collection_id": "60mwy-kqc90", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151210-120707709", "type": "article", "title": "Search for a charged Higgs boson in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0002-9730-9463", "clpid": "Chen-Yanbei" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a charged Higgs boson is performed with a data sample corresponding to an integrated luminosity of 19.7 \u00b1 0.5 fb^(-1) collected with the CMS detector in proton-proton collisions at \u221as = 8,TeV. The charged Higgs boson is searched for in top quark decays for m_H^\u00b1 < m_t - m_b, and in the direct production pp \u2192 t(b)H^\u00b1 for\nm_H^\u00b1 > m_t - m_b. The H^\u00b1 \u2192 \u03c4^\u00b1v_\u03c4 and H^\u00b1 \u2192 tb decay modes in the final states \u03c4_h+jets, \u00b5\u03c4_h,\u2113 + jets, and \u2113\u2113' (\u2113 = e, \u00b5) are considered in the search. No signal is observed and 95% confidence level upper limits are set on the charged Higgs boson production. A model independent\nupper limit on the product branching fraction B(t \u2192 H^\u00b1b) B(H^\u00b1 \u2192 \u03c4^\u00b1v_\u03c4) = 1.2-0.15% is obtained in the mass range mH^\u00b1 = 80-160 GeV, while the upper limit on the cross section times branching fraction \u03c3(pp \u2192 t(b)H\u00b1)B(H\u00b1 \u2192 \u03c4^\u00b1v_\u03c4) = 0.38-0.025 pb is set in the mass range mH_^+ = 180-600 GeV. Here, \u03c3(pp \u2192 t(b)H^\u00b1) stands for the cross\nsection sum \u03c3(pp \u2192 t(b)H^+) + \u03c3(pp \u2192 t(b)H^-). Assuming B(H^\u00b1 \u2192 tb) = 1, an upper limit on \u03c3(pp \u2192 t(b)H^\u00b1) of 2.0-0.13 pb is set for mH^\u00b1 = 180-600GeV. The combination of\nall considered decay modes and final states is used to set exclusion limits in the mH^\u00b1{tan \u03b2 parameter space in different MSSM benchmark scenarios.", "doi": "10.1007/JHEP11(2015)018", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-11-04", "series_number": "11", "volume": "2015", "issue": "11", "pages": "Art. No. 18" }, { "id": "authors:h8cyd-7jj95", "collection": "authors", "collection_id": "h8cyd-7jj95", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160106-152710794", "type": "article", "title": "Search for supersymmetry in the vector-boson fusion\n topology in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0002-9730-9463", "clpid": "Chen-Yanbei" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The first search for supersymmetry in the vector-boson fusion topology is presented. The search targets final states with at least two leptons, large missing transverse momentum, and two jets with a large separation in rapidity. The data sample corresponds to an integrated luminosity of 19.7 fb^(\u22121) of proton-proton collisions at \u221as=8 TeV collected with the CMS detector at the CERN LHC. The observed dijet invariant mass spectrum is found to be consistent with the expected standard model prediction. Upper limits are set on the cross sections for chargino and neutralino production with two associated jets, assuming the supersymmetric partner of the \u03c4 lepton to be the lightest slepton and the lightest slepton to be lighter than the charginos. For a so-called compressed-mass-spectrum scenario in which the mass difference between the lightest supersymmetric particle \u03c7^0_1 and the next lightest, mass-degenerate, gaugino particles \u03c7^0_2 and \u03c7^\u00b1_1 is 50 GeV, a mass lower limit of 170 GeV is set for these latter two particles.", "doi": "10.1007/JHEP11(2015)189", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-11", "series_number": "11", "volume": "2015", "issue": "11", "pages": "Art. No. 189" }, { "id": "authors:rwyjc-kx423", "collection": "authors", "collection_id": "rwyjc-kx423", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160112-065719213", "type": "article", "title": "Measurement of the differential cross section for top quark pair production in pp collisions at \u221as = 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" } ], "abstract": "The normalized differential cross section for top quark pair (tt) production is measured in pp collisions at a centre-of-mass energy of 8TeV at the CERN LHC using the CMS detector in data corresponding to an integrated luminosity of 19.7fb^(\u22121). The measurements are performed in the lepton+jets (e/\u03bc +jets) and in the dilepton (e^+e^\u2212, \u03bc^+\u03bc^\u2212, and e^\u00b1\u03bc^\u2213) decay channels. The tt cross section is measured as a function of the kinematic properties of the charged leptons, the jets associated to b quarks, the top quarks, and the tt system. The data are compared with several predictions from perturbative quantum chromodynamic up to approximate next-to-next-to-leading-order precision. No significant deviations are observed relative to the standard model predictions.", "doi": "10.1140/epjc/s10052-015-3709-x", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-11", "series_number": "11", "volume": "75", "issue": "11", "pages": "Art. No. 542" }, { "id": "authors:28rcw-c3e90", "collection": "authors", "collection_id": "28rcw-c3e90", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151116-112208121", "type": "article", "title": "Limits on the Higgs boson lifetime and width from its decay\n to four charged leptons", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0002-9730-9463", "clpid": "Chen-Yanbei" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "Ren-Yuan", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Constraints on the lifetime and width of the Higgs boson are obtained from H\u2192ZZ\u21924\u2113 events using data recorded by the CMS experiment during the LHC run 1 with an integrated luminosity of 5.1 and 19.7\u2009\u2009fb\u22121 at a center-of-mass energy of 7 and 8 TeV, respectively. The measurement of the Higgs boson lifetime is derived from its flight distance in the CMS detector with an upper bound of \u03c4_H<1.9\u00d710^(\u221213)\u2009\u2009s at the 95% confidence level (C.L.), corresponding to a lower bound on the width of \u0393_H>3.5\u00d710^(\u22129)\u2009\u2009MeV. The measurement of the width is obtained from an off-shell production technique, generalized to include anomalous couplings of the Higgs boson to two electroweak bosons. From this measurement, a joint constraint is set on the Higgs boson width and a parameter f\u039bQ that expresses an anomalous coupling contribution as an on-shell cross-section fraction. The limit on the Higgs boson width is \u0393_H<46\u2009\u2009MeV with f\u039bQ unconstrained and \u0393_H<26\u2009\u2009MeV for f_(\u039bQ)=0 at the 95% C.L. The constraint f_(\u039bQ)<3.8\u00d710^(\u22123) at the 95% C.L. is obtained for the expected standard model Higgs boson width.", "doi": "10.1103/PhysRevD.92.072010", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-10-22", "series_number": "7", "volume": "92", "issue": "7", "pages": "Art. No. 072010" }, { "id": "authors:rccyd-05a08", "collection": "authors", "collection_id": "rccyd-05a08", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151116-134544419", "type": "article", "title": "Comparison of the Z/\u03b3* + jets to \u03b3 + jets cross sections in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0002-9730-9463", "clpid": "Chen-Yanbei" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "Ren-Yuan", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A comparison of the differential cross sections for the processes Z/\u03b3* + jets and photon (\u03b3)+jets is presented. The measurements are based on data collected with the CMS detector at \u221as = 8 TeV corresponding to an integrated luminosity of 19.7 fb^(\u22121). The differential cross sections and their ratios are presented as functions of p_T. The measurements are also shown as functions of the jet multiplicity. Differential cross sections are obtained as functions of the ratio of the Z/\u03b3* p_T to the sum of all jet transverse momenta and of the ratio of the Z/\u03b3* p_T to the leading jet transverse momentum. The data are corrected for detector effects and are compared to simulations based on several QCD calculations.", "doi": "10.1007/JHEP10(2015)128", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-10-20", "series_number": "10", "volume": "2015", "issue": "10", "pages": "Art. No. 128" }, { "id": "authors:r4rfn-4hq26", "collection": "authors", "collection_id": "r4rfn-4hq26", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151116-101839282", "type": "article", "title": "Search for supersymmetry with photons in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "Ren-Yuan", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Two searches for physics beyond the standard model in events containing photons are presented. The data sample used corresponds to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121) of proton-proton collisions at \u221as =8\u2009\u2009TeV, collected with the CMS experiment at the CERN LHC. The analyses pursue different inclusive search strategies. One analysis requires at least one photon, at least two jets, and a large amount of transverse momentum imbalance, while the other selects events with at least two photons and at least one jet, and uses the razor variables to search for signal events. The background expected from standard model processes is evaluated mainly from data. The results are interpreted in the context of general gauge-mediated supersymmetry, with the next-to-lightest supersymmetric particle either a bino- or wino-like neutralino, and within simplified model scenarios. Upper limits at the 95% confidence level are obtained for cross sections as functions of the masses of the intermediate supersymmetric particles.", "doi": "10.1103/PhysRevD.92.072006", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-10-19", "series_number": "7", "volume": "92", "issue": "7", "pages": "Art. No. 072006" }, { "id": "authors:c19c6-mnq82", "collection": "authors", "collection_id": "c19c6-mnq82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151210-094246756", "type": "article", "title": "Measurement of the Z boson differential cross section in transverse momentum and rapidity in proton\u2013proton collisions at 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "We present a measurement of the Z boson differential cross section in rapidity and transverse momentum using a data sample of pp collision events at a centre-of-mass energy \u221as = 8 TeV, corresponding to an integrated luminosity of 19.7 fb^(\u22121). The Z boson is identified via its decay to a pair of muons. The measurement provides a precision test of quantum chromodynamics over a large region of phase space. In addition, due to the small experimental uncertainties in the measurement the data has the potential to constrain the gluon parton distribution function in the kinematic regime important for Higgs boson production via gluon fusion. The results agree with the next-to-next-to-leading-order predictions computed with the FEWZ program. The results are also compared to the commonly used leading-order MADGRAPH and next-to-leading-order POWHEG generators.", "doi": "10.1016/j.physletb.2015.07.065", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-10-07", "volume": "749", "pages": "187-209" }, { "id": "authors:x89dm-fh981", "collection": "authors", "collection_id": "x89dm-fh981", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151210-113520252", "type": "article", "title": "Search for resonant pair production of Higgs bosons decaying to two bottom quark\u2013antiquark pairs in proton\u2013proton collisions at 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A model-independent search for a narrow resonance produced in proton\u2013proton collisions at \u221as = 8 TeV and decaying to a pair of 125 GeV Higgs bosons that in turn each decays into a bottom quark\u2013antiquark pair is performed by the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 17.9 fb_(\u22121). No evidence for a signal is observed. Upper limits at a 95% confidence level on the production cross section for such a resonance, in the mass range from 270 to 1100 GeV, are reported. Using these results, a radion with decay constant of 1 TeV and mass from 300 to 1100 GeV, and a Kaluza\u2013Klein graviton with mass from 380 to 830 GeV are excluded at a 95% confidence level.", "doi": "10.1016/j.physletb.2015.08.047", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-10-07", "volume": "749", "pages": "560-582" }, { "id": "authors:bdd9n-w1636", "collection": "authors", "collection_id": "bdd9n-w1636", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151210-110413470", "type": "article", "title": "Search for lepton-flavour-violating decays of the Higgs boson", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The first direct search for lepton-flavour-violating decays of the recently discovered Higgs boson (H) is described. The search is performed in the H\u2192\u03bc\u03c4_e and H\u2192\u03bc\u03c4_h channels, where \u03c4e\u03c4e and \u03c4_h are tau leptons reconstructed in the electronic and hadronic decay channels, respectively. The data sample used in this search was collected in pp collisions at a centre-of-mass energy of \u221as = 8 TeV with the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 19.7 fb^(\u22121). The sensitivity of the search is an order of magnitude better than the existing indirect limits. A slight excess of signal events with a significance of 2.4 standard deviations is observed. The p-value of this excess at M_H=125 GeV is 0.010. The best fit branching fraction is (H\u2192\u03bc\u03c4)=(0.84_(\u22120.37)^(+0.39))%. A constraint on the branching fraction, B(H\u2192\u03bc\u03c4)<1.51% at 95% confidence level is set. This limit is subsequently used to constrain the \u03bc\u2013\u03c4 Yukawa couplings to be less than 3.6\u00d710^(\u22123).", "doi": "10.1016/j.physletb.2015.07.053", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-10-07", "volume": "749", "pages": "337-362" }, { "id": "authors:n4ax9-6bj83", "collection": "authors", "collection_id": "n4ax9-6bj83", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151210-100746706", "type": "article", "title": "Measurements of the \u03d2(1S), \u03d2(2S), and \u03d2(3S) differential cross sections in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Differential cross sections as a function of transverse momentum p_T are presented for the production of \u03d2(nS)(n=1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9fb^(\u22121) in pp collisions at \u221as=7 TeVwere collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity |y| <1.2and dimuon transverse momentum in the range 10", "doi": "10.1016/j.physletb.2015.07.037", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-10-07", "volume": "749", "pages": "14-34" }, { "id": "authors:q6s2s-jrj42", "collection": "authors", "collection_id": "q6s2s-jrj42", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151120-103500681", "type": "article", "title": "Search for a Higgs boson in the mass range from 145 to 1000 GeV decaying to a pair of W or Z bosons", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a heavy Higgs boson in the H \u2192 WW and H \u2192 ZZ decay channels is reported. The search is based upon proton-proton collision data samples corresponding to an integrated luminosity of up to 5.1 fb^(\u22121) at \u221as =7 TeV and up to 19.7fb^(\u22121) at \u221as = 8 TeV, recorded by the CMS experiment at the CERN LHC. Several final states of the H \u2192 WW and H \u2192 ZZ decays are analyzed. The combined upper limit at the 95% confidence level on the product of the cross section and branching fraction exclude a Higgs boson with standard model-like couplings and decays in the range 145 < m_H < 1000 GeV. We also interpret the results in the context of an electroweak singlet extension of the standard model.", "doi": "10.1007/JHEP10(2015)144", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-10", "series_number": "10", "volume": "2015", "issue": "10", "pages": "Art. No. 144" }, { "id": "authors:sde4j-pxa62", "collection": "authors", "collection_id": "sde4j-pxa62", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160811-153403627", "type": "article", "title": "Measurements of the ZZ production cross sections in the 2l2\u03bd channel in proton\u2013proton collisions at \u221as = 7 and 8 TeV and combined constraints on triple gauge couplings", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the ZZ production cross sections in proton\u2013proton collisions at center-of-mass energies of 7 and 8 TeV are presented. Candidate events for the leptonic decay mode ZZ\u21922l2\u03bd, where l denotes an electron or a muon, are reconstructed and selected from data corresponding to an integrated luminosity of 5.1 (19.6)fb^(-1) at 7 (8) TeV collected with the CMS experiment. The measured cross sections, \u03c3(pp\u2192ZZ)=5.1^(+1.5)_(\u22121.4)(stat)^(+1.4)_(\u22121.1)(syst)\u00b10.1(lumi)~pb at 7 TeV, and 7.2^(+0.8)_(\u22120.8)(stat)^(+1.9)_(\u22121.5)(syst)\u00b10.2(lumi)~pb at 8 TeV, are in good agreement with the standard model predictions with next-to-leading-order accuracy. The selected data are analyzed to search for anomalous triple gauge couplings involving the ZZ final state. In the absence of any deviation from the standard model predictions, limits are set on the relevant parameters. These limits are then combined with the previously published CMS results for ZZ in 4l final states, yielding the most stringent constraints on the anomalous couplings.", "doi": "10.1140/epjc/s10052-015-3706-0", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-10", "series_number": "10", "volume": "75", "issue": "10", "pages": "Art. No. 511" }, { "id": "authors:eb0v1-4pj08", "collection": "authors", "collection_id": "eb0v1-4pj08", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150306-092024350", "type": "article", "title": "Search for narrow high-mass resonances in proton-proton collisions at \u221as = 8 TeV decaying to Z and Higgs bosons", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a narrow, high-mass resonance decaying into Z and Higgs (H) bosons is presented. The final state studied consists of a merged jet pair and a \u03c4 pair resulting from the decays of Z and H bosons, respectively. The analysis is based on a data sample of proton\u2013proton collisions at a center-of-mass energy of 8 TeV, collected with the CMS experiment in 2012, and corresponding to an integrated luminosity of 19.7 fb^(\u22121). In the resonance mass range of interest, which extends from 0.8 to 2.5 TeV, the Z and H bosons are produced with large momenta, which implies that the final products of the two quarks or the two \u03c4 leptons must be detected within a small angular interval. From a combination of all possible decay modes of the \u03c4 leptons, production cross sections in a range between 0.9 and 27.8 fb are excluded at 95% confidence level, depending on the resonance mass.", "doi": "10.1016/j.physletb.2015.07.011", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-09-02", "volume": "748", "pages": "255-277" }, { "id": "authors:cdh8t-9e289", "collection": "authors", "collection_id": "cdh8t-9e289", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150915-111733066", "type": "article", "title": "Search for heavy Majorana neutrinos in \u03bc\u00b1\u03bc\u00b1 + jets events in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for heavy Majorana neutrinos (N) using an event signature defined by two muons of the same charge and two jets (\u03bc\u00b1\u03bc\u00b1jj). The data correspond to an integrated luminosity of 19.7fb^(\u22121) of proton\u2013proton collisions at a center-of-mass energy of 8TeV, collected with the CMS detector at the CERN LHC. No excess of events is observed beyond the expected standard model background and upper limits are set on |V_(\u03bcN)|^2 as a function of Majorana neutrino mass m_N for masses in the range of 40\u2013500GeV, where V_(\u03bcN) is the mixing element of the heavy neutrino with the standard model muon neutrino. The limits obtained are |V_(\u03bcN)|^2<0.00470 for m_N=90GeV, |V_(\u03bcN)|^2<0.0123 for m_N=200GeV, and |V_(\u03bcN)|^2<0.583 for m_N=500GeV. These results extend considerably the regions excluded by previous direct searches.", "doi": "10.1016/j.physletb.2015.06.070", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-09-02", "volume": "748", "pages": "144-166" }, { "id": "authors:tqz7g-xct77", "collection": "authors", "collection_id": "tqz7g-xct77", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150915-130324106", "type": "article", "title": "Search for a pseudoscalar boson decaying into a Z boson and the 125 GeV Higgs boson in \u2113+\u2113\u2212bb final states", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported on a search for decays of a pseudoscalar A boson into a Z boson and a light scalar h boson, where the Z boson decays into a pair of oppositely-charged electrons or muons, and the h boson decays into bb\u203e. The search is based on data from proton\u2013proton collisions at a center-of-mass energy \u221as=8 TeV collected with the CMS detector, corresponding to an integrated luminosity of 19.7 fb^(\u22121). The h boson is assumed to be the standard model-like Higgs boson with a mass of 125 GeV. With no evidence for signal, upper limits are obtained on the product of the production cross section and the branching fraction of the A boson in the Zh channel. Results are also interpreted in the context of two Higgs doublet models.", "doi": "10.1016/j.physletb.2015.07.010", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-09-02", "volume": "748", "pages": "221-243" }, { "id": "authors:t8qr0-x5m64", "collection": "authors", "collection_id": "t8qr0-x5m64", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151103-133100393", "type": "article", "title": "Search for neutral color-octet weak-triplet scalar particles in proton-proton collisions at \u221as=8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair production of neutral color-octet weak-triplet scalar particles (\u0398^0) is performed in processes where one \u03980 decays to a pair of b quark jets and the other to a Z boson plus a jet, with the Z boson decaying to a pair of electrons or muons. The search is performed with data collected by the CMS experiment at the CERN LHC corresponding to an integrated luminosity of 19.7 fb^(\u22121) of proton-proton collisions at \u221as=8 TeV. The number of observed events is found to be in agreement with the standard model predictions. The 95% confidence level upper limit on the product of the cross section and branching fraction is obtained as a function of the \u0398^0 mass. The 95% confidence level lower bounds on the \u0398^0 mass are found to be 623 and 426 GeV, for two different octo-triplet theoretical scenarios. These are the first direct experimental bounds on particles predicted by the octo-triplet model.", "doi": "10.1007/JHEP09(2015)201", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-09", "series_number": "9", "volume": "2015", "issue": "9", "pages": "Art. No. 201" }, { "id": "authors:c96wg-85x76", "collection": "authors", "collection_id": "c96wg-85x76", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151012-154950185", "type": "article", "title": "Community Seismic Network: A Dense Array to Sense Earthquake Strong Motion", "author": [ { "family_name": "Clayton", "given_name": "Robert W.", "orcid": "0000-0003-3323-3508", "clpid": "Clayton-R-W" }, { "family_name": "Heaton", "given_name": "Thomas H.", "orcid": "0000-0003-3363-2197", "clpid": "Heaton-T-H" }, { "family_name": "Kohler", "given_name": "Monica D.", "orcid": "0000-0002-4703-190X", "clpid": "Kohler-M-D" }, { "family_name": "Chandy", "given_name": "Mani", "orcid": "0000-0001-9190-1290", "clpid": "Chandy-K-M" }, { "family_name": "Guy", "given_name": "Richard", "orcid": "0000-0002-8651-5608", "clpid": "Guy-Richard" }, { "family_name": "Bunn", "given_name": "Julian J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" } ], "abstract": "The Community Seismic Network (CSN) is currently a 500\u2010element strong\u2010motion network located in the Los Angeles area of California (see Fig. 1). The sensors in the network are low\u2010cost microelectromechanical (MEM) accelerometers that are capable of recording on scale up to accelerations of \u00b12g. The primary product of the network is a set of measurements of ground shaking in the seconds following a major earthquake. An example of this is shown in Figure 2. The shaking information will be contributed to U.S. Geological Survey products such as ShakeMap (Wald et al., 1999) and ShakeCast (Wald et al., 2006), with the goal of providing first responders a proxy for damage that can guide efforts immediately following the event. The basic premise is the strong ground\u2010motion shaking varies on a subkilometer scale, which will require a dense network to meaningfully measure the shaking. Evidence for this comes from earthquakes recorded by dense oil company surveys in the Los Angeles area (Clayton et al., 2011).", "doi": "10.1785/0220150094", "issn": "0895-0695", "publisher": "Seismological Society of America", "publication": "Seismological Research Letters", "publication_date": "2015-09", "series_number": "5", "volume": "86", "issue": "5", "pages": "1354-1363" }, { "id": "authors:2pmgd-jmb53", "collection": "authors", "collection_id": "2pmgd-jmb53", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151203-075553361", "type": "article", "title": "Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at \u221as = 2.76 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region (|\u03b7^(jet)| < 2) and with transverse momentum 1 \u2264 p_T^(jet) < 100 GeV. The analysis uses a data sample collected at a centre-of-mass energy of 2.76 TeV with the CMS experiment at the LHC. The UE activity is measured as a function of p_T^(jet) in terms of the average multiplicity and scalar sum of transverse momenta (p_T) of charged particles, with |\u03b7| < 2 and p_T > 0.5 GeV, in the azimuthal region transverse to the highest p_T jet direction. By further dividing the transverse region into two regions of smaller and larger activity, various components of the UE activity are separated. The measurements are compared to previous results at 0.9 and 7 TeV, and to predictions of several Monte Carlo event generators, providing constraints on the modelling of the UE dynamics.", "doi": "10.1007/JHEP09(2015)137", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-09", "series_number": "9", "volume": "2015", "issue": "9", "pages": "Art. No. 137" }, { "id": "authors:9fepk-10044", "collection": "authors", "collection_id": "9fepk-10044", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151104-081317098", "type": "article", "title": "Search for the standard model Higgs boson produced through vector boson fusion and decaying to bb\u00af", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A first search is reported for a standard model Higgs boson (H) that is produced through vector boson fusion and decays to a bottom-quark pair. Two data samples, corresponding to integrated luminosities of 19.8\u2009\u2009fb^(\u22121) and 18.3\u2009\u2009fb^(\u22121) of proton-proton collisions at s\u221a=8\u2009\u2009TeV were selected for this channel at the CERN LHC. The observed significance in these data samples for a H\u2192bb signal at a mass of 125 GeV is 2.2 standard deviations, while the expected significance is 0.8 standard deviations. The fitted signal strength \u03bc=\u03c3/\u03c3_(SM)=2.8^(+1.6)_(\u22121.4). The combination of this result with other CMS searches for the Higgs boson decaying to a b-quark pair yields a signal strength of 1.0\u00b10.4, corresponding to a signal significance of 2.6 standard deviations for a Higgs boson mass of 125 GeV.", "doi": "10.1103/PhysRevD.92.032008", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-08-01", "series_number": "3", "volume": "92", "issue": "3", "pages": "Art. No. 032008" }, { "id": "authors:qryy4-khf81", "collection": "authors", "collection_id": "qryy4-khf81", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151030-074055720", "type": "article", "title": "Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A description is provided of the performance of the CMS detector for photon reconstruction and identification in proton-proton collisions at a centre-of-mass energy of 8 TeV at the CERN LHC. Details are given on the reconstruction of photons from energy deposits in the electromagnetic calorimeter (ECAL) and the extraction of photon energy estimates. The reconstruction of electron tracks from photons that convert to electrons in the CMS tracker is also described, as is the optimization of the photon energy reconstruction and its accurate modelling in simulation, in the analysis of the Higgs boson decay into two photons. In the barrel section of the ECAL, an energy resolution of about 1% is achieved for unconverted or late-converting photons from H\u2192\u03b3\u03b3 decays. Different photon identification methods are discussed and their corresponding selection efficiencies in data are compared with those found in simulated events.", "doi": "10.1088/1748-0221/10/08/P08010", "issn": "1748-0221", "publisher": "International School of Advanced Studies", "publication": "Journal of Instrumentation", "publication_date": "2015-08", "series_number": "8", "volume": "10", "issue": "8", "pages": "Art. No. P08010" }, { "id": "authors:hgdaj-q8b74", "collection": "authors", "collection_id": "hgdaj-q8b74", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150825-141109640", "type": "article", "title": "Search for pair-produced resonances decaying to jet pairs in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported of a general search for pair production of heavy resonances decaying to pairs of hadronic jets in events with at least four jets. The study is based on up to 19.4 fb^(\u22121) of integrated luminosity from proton\u2013proton collisions at a center-of-mass energy of 8 TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The first assumes decay to a bottom quark and a light-flavor quark and is excluded for masses between 200 and 385 GeV, and the second assumes decay to a pair of light-flavor quarks and is excluded for masses between 200 and 350 GeV at 95% confidence level. Previous limits on colorons decaying to light-flavor quarks are extended to exclude masses from 200 to 835 GeV.", "doi": "10.1016/j.physletb.2015.04.045", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-07-30", "volume": "747", "pages": "98-119" }, { "id": "authors:arjdm-fcq11", "collection": "authors", "collection_id": "arjdm-fcq11", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151027-152103819", "type": "article", "title": "Constraints on the pMSSM, AMSB model and on other models from the search for long-lived charged particles in proton\u2013proton collisions at \u221as = 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Stringent limits are set on the long-lived lepton-like sector of the phenomenological minimal supersymmetric standard model (pMSSM) and the anomaly-mediated supersymmetry breaking (AMSB) model. The limits are derived from the results presented in a recent search for long-lived charged particles in proton\u2013proton collisions, based on data collected by the CMS detector at a centre-of-mass energy of 8 TeV at the Large Hadron Collider. In the pMSSM parameter sub-space considered, 95.9 % of the points predicting charginos with a lifetime of at least 10 ns are excluded. These constraints on the pMSSM are the first obtained at the LHC. Charginos with a lifetime greater than 100 ns and masses up to about 800 GeV in the AMSB model are also excluded. The method described can also be used to set constraints on other models.", "doi": "10.1140/epjc/s10052-015-3533-3", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-07-17", "series_number": "7", "volume": "75", "issue": "7", "pages": "Art. No. 325" }, { "id": "authors:qp6cp-7g412", "collection": "authors", "collection_id": "qp6cp-7g412", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150812-125943389", "type": "article", "title": "Measurement of diffractive dissociation cross sections in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of diffractive dissociation cross sections in pp collisions at s\u221a =7\u2009\u2009TeV are presented in kinematic regions defined by the masses M_X and M_Y of the two final-state hadronic systems separated by the largest rapidity gap in the event. Differential cross sections are measured as a function of \u03be_X =M^2_X/s in the region \u22125.53, log(10)M_X >1.1, and log_(10)M_Y >1.1, a region dominated by DD. The cross sections integrated over these regions are found to be, respectively, 2.99\u00b10.02(stat)^(+0.32)_(\u22120.29)(syst)\u2009\u2009mb, 1.18\u00b10.02(stat)\u00b10.13(syst)\u2009\u2009mb, and 0.58\u00b10.01(stat)^(+0.13)_(\u22120.11)(syst)\u2009\u2009mb, and are used to extract extrapolated total SD and DD cross sections. In addition, the inclusive differential cross section, d\u03c3/d\u0394_\u03b7^F, for events with a pseudorapidity gap adjacent to the edge of the detector, is measured over \u0394_\u03b7^F =8.4 units of pseudorapidity. The results are compared to those of other experiments and to theoretical predictions and found compatible with slowly rising diffractive cross sections as a function of center-of-mass energy.", "doi": "10.1103/PhysRevD.92.012003", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-07-06", "series_number": "1", "volume": "92", "issue": "1", "pages": "Art. No. 012003" }, { "id": "authors:3ff3h-z4371", "collection": "authors", "collection_id": "3ff3h-z4371", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150902-062617855", "type": "article", "title": "Constraints on the spin-parity and anomalous HVV couplings of the Higgs boson in proton collisions at 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The study of the spin-parity and tensor structure of the interactions of the recently discovered Higgs boson is performed using the H\u2192ZZ,Z\u03b3^\u2217,\u03b3^\u2217\u03b3^\u2217\u21924\u2113, H\u2192WW\u2192\u2113\u03bd\u2113\u03bd, and H\u2192\u03b3\u03b3 decay modes. The full data set recorded by the CMS experiment during the LHC run 1 is used, corresponding to an integrated luminosity of up to 5.1\u2009\u2009fb^(\u22121) at a center-of-mass energy of 7 TeV and up to 19.7\u2009\u2009fb^(\u22121) at 8 TeV. A wide range of spin-two models is excluded at a 99% confidence level or higher, or at a 99.87% confidence level for the minimal gravitylike couplings, regardless of whether assumptions are made on the production mechanism. Any mixed-parity spin-one state is excluded in the ZZ and WW modes at a greater than 99.999% confidence level. Under the hypothesis that the resonance is a spin-zero boson, the tensor structure of the interactions of the Higgs boson with two vector bosons ZZ, Z\u03b3, \u03b3\u03b3, and WW is investigated and limits on eleven anomalous contributions are set. Tighter constraints on anomalous HVV interactions are obtained by combining the HZZ and HWW measurements. All observations are consistent with the expectations for the standard model Higgs boson with the quantum numbers J^(PC)=0^(++).", "doi": "10.1103/PhysRevD.92.012004", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-07-01", "series_number": "1", "volume": "92", "issue": "1", "pages": "Art. No. 012004" }, { "id": "authors:8d3ws-5eh62", "collection": "authors", "collection_id": "8d3ws-5eh62", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150306-080618882", "type": "article", "title": "Distributions of topological observables in inclusive three- and four-jet events in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper presents distributions of topological observables in inclusive three- and four-jet events produced in pp collisions at a centre-of-mass energy of 7 TeV with a data sample collected by the CMS experiment corresponding to a luminosity of 5.1 fb^(\u22121). The distributions are corrected for detector effects, and compared with several event generators based on two- and multi-parton matrix elements at leading order. Among the considered calculations, MadGraph interfaced with pythia6 displays the overall best agreement with data.", "doi": "10.1140/epjc/s10052-015-3491-9", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-07", "series_number": "7", "volume": "75", "issue": "7", "pages": "Art. No. 302" }, { "id": "authors:apnv4-dwv21", "collection": "authors", "collection_id": "apnv4-dwv21", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150807-124315509", "type": "article", "title": "Search for third-generation scalar leptoquarks in the t\u03c4 channel in proton-proton collisions at s\u221a=8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair production of third-generation scalar leptoquarks decaying to top quark and \u03c4 lepton pairs is presented using proton-proton collision data at a center-of-mass energy of s\u221a=8 TeV collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 19.7 fb^(\u22121). The search is performed using events that contain an electron or a muon, a hadronically decaying \u03c4 lepton, and two or more jets. The observations are found to be consistent with the standard model predictions. Assuming that all leptoquarks decay to a top quark and a \u03c4 lepton, the existence of pair produced, charge \u22121/3, third-generation leptoquarks up to a mass of 685 GeV is excluded at 95% confidence level. This result constitutes the first direct limit for leptoquarks decaying into a top quark and a \u03c4 lepton, and may also be applied directly to the pair production of bottom squarks decaying predominantly via the R-parity violating coupling \u03bb_('333).", "doi": "10.1007/JHEP07(2015)042", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-07", "series_number": "7", "volume": "2015", "issue": "7", "pages": "Art. No. 42" }, { "id": "authors:2vcae-rfq17", "collection": "authors", "collection_id": "2vcae-rfq17", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150626-074211079", "type": "article", "title": "Search for quark contact interactions and extra spatial dimensions using dijet angular distributions in proton\u2013proton collisions at \u221as = 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for quark contact interactions and extra spatial dimensions in proton\u2013proton collisions at \u221as = 8TeV using dijet angular distributions. The search is based on a data set corresponding to an integrated luminosity of 19.7 fb^(\u22121) collected by the CMS detector at the CERN LHC. Dijet angular distributions are found to be in agreement with the perturbative QCD predictions that include electroweak corrections. Limits on the contact interaction scale from a variety of models at next-to-leading order in QCD corrections are obtained. A benchmark model in which only left-handed quarks participate is excluded up to a scale of 9.0 (11.7) TeV for destructive (constructive) interference at 95% confidence level. Lower limits between 5.9 and 8.4 TeV on the scale of virtual graviton exchange are extracted for the Arkani-Hamed\u2013Dimopoulos\u2013Dvali model of extra spatial dimensions.", "doi": "10.1016/j.physletb.2015.04.042", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-06-30", "volume": "746", "pages": "79-99" }, { "id": "authors:magjh-rmp16", "collection": "authors", "collection_id": "magjh-rmp16", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150625-114619191", "type": "article", "title": "Measurement of the cross section ratio \u03c3_(ttbb)/\u03c3_(ttjj) in pp collisions at \u221as = 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "The first measurement of the cross section ratio \u03c3_(ttbb)/\u03c3_(ttjj) is presented using a data sample corresponding to an integrated luminosity of 19.6 fb^(\u22121) collected in pp collisions at \u221as = 8TeV with the CMS detector at the LHC. Events with two leptons (e or \u03bc) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum pT of both 20 and 40 GeV/c. The measured ratio is 0.022 \u00b1 0.003(stat) \u00b1 0.005(syst) for pT > 20 GeV/c. The absolute cross sections \u03c3_(ttbb) and \u03c3_(ttjj) are also measured. The measured ratio for pT > 40 GeV/c is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order.", "doi": "10.1016/j.physletb.2015.04.060", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-06-30", "volume": "746", "pages": "132-153" }, { "id": "authors:amv0j-f1n97", "collection": "authors", "collection_id": "amv0j-f1n97", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150707-130041582", "type": "article", "title": "Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks is presented. Events with hadronic jets and one or two oppositely charged leptons are selected from a data sample corresponding to an integrated luminosity of 19.5fb^(-1) collected by the CMS experiment at the LHC in pp collisions at a centre-of-mass energy of 8TeV. In order to separate the signal from the larger tt + jets background, this analysis uses a matrix element method that assigns a probability density value to each reconstructed event under signal or background hypotheses. The ratio between the two values is used in a maximum likelihood fit to extract the signal yield. The results are presented in terms of the measured signal strength modifier, \u03bc, relative to the standard model prediction for a Higgs boson mass of 125GeV. The observed (expected) exclusion limit at a 95 % confidence level is \u03bc<4.2 (3.3), corresponding to a best fit value \u03bc^=1.2^(+1.6)_(\u22121.5).", "doi": "10.1140/epjc/s10052-015-3454-1", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-06-09", "series_number": "6", "volume": "75", "issue": "6", "pages": "Art. No. 251" }, { "id": "authors:9gy42-57e25", "collection": "authors", "collection_id": "9gy42-57e25", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150817-091100047", "type": "article", "title": "Search for vector-like T quarks decaying to top quarks and Higgs bosons in the all-hadronic channel using jet substructure", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for a vector-like heavy T quark that is produced in pairs and that decays to a top quark and a Higgs boson. The data analysed correspond to an integrated luminosity of 19.7 fb^(\u22121) collected with the CMS detector in proton-proton collisions at s\u221a =8TeV. For T quarks with large mass values the top quarks and Higgs bosons can have significant Lorentz boosts, so that their individual decay products often overlap and merge. Methods are applied to resolve the substructure of such merged jets. Upper limits on the production cross section of a T quark with mass between 500 and 1000 GeV/c^2 are derived. If the T quark decays exclusively to tH, the observed (expected) lower limit on the mass of the T quark is 745 (773) GeV/c^2 at 95% confidence level. For the first time an algorithm is used for tagging boosted Higgs bosons that is based on a combination of jet substructure information and b tagging.", "doi": "10.1007/JHEP06(2015)080", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-06", "series_number": "6", "volume": "2015", "issue": "6", "pages": "Art. No. 080" }, { "id": "authors:qj5vs-44a71", "collection": "authors", "collection_id": "qj5vs-44a71", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150817-151646379", "type": "article", "title": "Search for the production of dark matter in association with top-quark pairs in the single-lepton final state in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for particle dark matter produced in association with a pair of top quarks in pp collisions at a centre-of-mass energy of \u221as=8 TeV. The data were collected with the CMS detector at the LHC and correspond to an integrated luminosity of 19.7 fb^(\u22121). This search requires the presence of one lepton, multiple jets, and large missing transverse energy. No excess of events is found above the SM expectation, and upper limits are derived on the production cross section. Interpreting the findings in the context of a scalar contact interaction between fermionic dark matter particles and top quarks, lower limits on the interaction scale are set. These limits are also interpreted in terms of the dark matter-nucleon scattering cross sections for the spin-independent scalar operator and they complement direct searches for dark matter particles in the low mass region.", "doi": "10.1007/JHEP06(2015)121", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-06", "series_number": "6", "volume": "2015", "issue": "6", "pages": "Art. No. 121" }, { "id": "authors:4xcsf-nt817", "collection": "authors", "collection_id": "4xcsf-nt817", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150817-111241526", "type": "article", "title": "Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The performance and strategies used in electron reconstruction and selection at CMS are presented based on data corresponding to an integrated luminosity of 19.7 fb^(\u22121), collected in proton-proton collisions at \u221as = 8 TeV at the CERN LHC. The paper focuses on prompt isolated electrons with transverse momenta ranging from about 5 to a few 100 GeV. A detailed description is given of the algorithms used to cluster energy in the electromagnetic calorimeter and to reconstruct electron trajectories in the tracker. The electron momentum is estimated by combining the energy measurement in the calorimeter with the momentum measurement in the tracker. Benchmark selection criteria are presented, and their performances assessed using Z, Y, and J/\u03c8 decays into e+ + e\u2212 pairs. The spectra of the observables relevant to electron reconstruction and selection as well as their global efficiencies are well reproduced by Monte Carlo simulations. The momentum scale is calibrated with an uncertainty smaller than 0.3%. The momentum resolution for electrons produced in Z boson decays ranges from 1.7 to 4.5%, depending on electron pseudorapidity and energy loss through bremsstrahlung in the detector material.", "doi": "10.1088/1748-0221/10/06/P06005", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2015-06", "series_number": "10", "volume": "2015", "issue": "10", "pages": "Art. No. P06005" }, { "id": "authors:xbwsr-4z557", "collection": "authors", "collection_id": "xbwsr-4z557", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150817-135154558", "type": "article", "title": "Searches for third-generation squark production in fully hadronic final states in proton-proton collisions at s\u221a= 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Searches for third-generation squarks in fully hadronic final states are presented using data samples corresponding to integrated luminosities of 19.4 or 19.7 fb^(\u22121), collected at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. Three mutually exclusive searches are presented, each optimized for a different decay topology. They include a multijet search requiring one fully reconstructed top quark, a dijet search requiring one or two jets originating from b quarks, and a monojet search. No excesses above the standard model expectations are seen, and limits are set on top and bottom squark production in the context of simplified models of supersymmetry.", "doi": "10.1007/JHEP06(2015)116", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-06", "series_number": "6", "volume": "2015", "issue": "6", "pages": "Art. No. 116" }, { "id": "authors:amw8x-p4455", "collection": "authors", "collection_id": "amw8x-p4455", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150818-105032582", "type": "article", "title": "Constraints on parton distribution functions and extraction of the strong coupling constant from the inclusive jet cross section in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The inclusive jet cross section for proton\u2013proton collisions at a centre-of-mass energy of 7 TeV was measured by the CMS Collaboration at the LHC with data corresponding to an integrated luminosity of 5.0 fb^(\u22121). The measurement covers a phase space up to 2 TeV in jet transverse momentum and 2.5 in absolute jet rapidity. The statistical precision of these data leads to stringent constraints on the parton distribution functions of the proton. The data provide important input for the gluon density at high fractions of the proton momentum and for the strong coupling constant at large energy scales. Using predictions from perturbative quantum chromodynamics at next-to-leading order, complemented with electroweak corrections, the constraining power of these data is investigated and the strong coupling constant at the Z boson mass M_Z is determined to be \u03b1_S (M_Z) = 0.1185 \u00b1 0.0019(exp)^(+0.0060)_(\u22120.0037)(theo) , which is in agreement with the world average.", "doi": "10.1140/epjc/s10052-015-3499-1", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-06", "volume": "75", "pages": "Art. No. 288" }, { "id": "authors:djaz3-yfs85", "collection": "authors", "collection_id": "djaz3-yfs85", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150710-154028856", "type": "article", "title": "Search for dark matter, extra dimensions, and unparticles in monojet events in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for particle dark matter (DM), extra dimensions, and unparticles using events containing a jet and an imbalance in transverse momentum. The data were collected by the CMS detector in proton\u2013proton collisions at the LHC and correspond to an integrated luminosity of 19.7fb^(-1) at a centre-of-mass energy of 8TeV. The number of observed events is found to be consistent with the standard model prediction. Limits are placed on the DM-nucleon scattering cross section as a function of the DM particle mass for spin-dependent and spin-independent interactions. Limits are also placed on the scale parameter M_D in the Arkani-Hamed, Dimopoulos, and Dvali (ADD) model of large extra dimensions, and on the unparticle model parameter \u039b_U. The constraints on ADD models and unparticles are the most stringent limits in this channel and those on the DM-nucleon scattering cross section are an improvement over previous collider results.", "doi": "10.1140/epjc/s10052-015-3451-4", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-05-29", "series_number": "5", "volume": "75", "issue": "5", "pages": "Art. No. UNSP 235" }, { "id": "authors:xtfr1-r9z41", "collection": "authors", "collection_id": "xtfr1-r9z41", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150603-085845235", "type": "article", "title": "Searches for supersymmetry based on events with b jets and four W bosons in pp collisions at 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "Five mutually exclusive searches for supersymmetry are presented based on events in which b jets and four W bosons are produced in proton\u2013proton collisions at \u221as = 8 TeV. The data, corresponding to an integrated luminosity of 19.5 fb^(\u22121), were collected with the CMS experiment at the CERN LHC in 2012. The five studies differ in the leptonic signature from the W boson decays, and correspond to all-hadronic, single-lepton, opposite-sign dilepton, same-sign dilepton, and \u22653 lepton final states. The results of the five studies are combined to yield 95% confidence level limits for the gluino and bottom-squark masses in the context of gluino and bottom-squark pair production, respectively. In the limit when the lightest supersymmetric particle is light, gluino and bottom squark masses are excluded below 1280 and 570 GeV, respectively.", "doi": "10.1016/j.physletb.2015.04.002", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-05-18", "volume": "745", "pages": "5-28" }, { "id": "authors:czp5n-aa095", "collection": "authors", "collection_id": "czp5n-aa095", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150617-074541166", "type": "article", "title": "Combined Measurement of the Higgs Boson Mass in pp Collisions at \u221as = 7 and 8 TeV with the ATLAS and CMS Experiments", "author": [ { "family_name": "Aad", "given_name": "G.", "clpid": "Aad-G" }, { "family_name": "Anderson", "given_name": "D.", "clpid": "Anderson-D" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "ATLAS Collaboration" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H\u2192\u03b3\u03b3 and H\u2192ZZ\u21924\u2113 decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. The measured masses from the individual channels and the two experiments are found to be consistent among themselves. The combined measured mass of the Higgs boson is m_H=125.09\u00b10.21\u2009(stat)\u00b10.11\u2009(syst)\u2009\u2009GeV.", "doi": "10.1103/PhysRevLett.114.191803", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2015-05-15", "series_number": "19", "volume": "114", "issue": "19", "pages": "Art. No. 191803" }, { "id": "authors:n0jvd-kgt12", "collection": "authors", "collection_id": "n0jvd-kgt12", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150617-072228411", "type": "article", "title": "Measurement of J=\u03c8 and \u03c8(2S) Prompt Double-Differential Cross Sections in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The double-differential cross sections of promptly produced J/\u03c8 and \u03c8(2S) mesons are measured in pp collisions at s\u221a=7\u2009\u2009TeV, as a function of transverse momentum pT and absolute rapidity |y|. The analysis uses J/\u03c8 and \u03c8(2S) dimuon samples collected by the CMS experiment, corresponding to integrated luminosities of 4.55 and 4.90\u2009\u2009fb^(\u22121), respectively. The results are based on a two-dimensional analysis of the dimuon invariant mass and decay length, and extend to pT=120 and 100 GeV for the J/\u03c8 and \u03c8(2S), respectively, when integrated over the interval |y|<1.2. The ratio of the \u03c8(2S) to J/\u03c8 cross sections is also reported for |y|<1.2, over the range 10", "doi": "10.1103/PhysRevLett.114.191802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2015-05-15", "series_number": "19", "volume": "114", "issue": "19", "pages": "Art. No. 191802" }, { "id": "authors:20raj-96715", "collection": "authors", "collection_id": "20raj-96715", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150706-141709897", "type": "article", "title": "Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0002-9730-9463", "clpid": "Chen-Yanbei" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "R.", "clpid": "Vlimant-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Properties of the Higgs boson with mass near 125GeV are measured in proton-proton collisions with the CMS experiment at the LHC. Comprehensive sets of production and decay measurements are combined. The decay channels include \u03b3\u03b3, ZZ, WW, \u03c4\u03c4, bb, and \u03bc\u03bc pairs. The data samples were collected in 2011 and 2012 and correspond to integrated luminosities of up to 5.1fb^(-1) at 7TeV and up to 19.7fb^(-1) at 8TeV. From the high-resolution \u03b3\u03b3 and ZZ channels, the mass of the Higgs boson is determined to be 125.02^(+0.26)_(\u22120.27)(stat)^(+0.14)_(\u22120.15)(syst)GeV. For this mass value, the event yields obtained in the different analyses tagging specific decay channels and production mechanisms are consistent with those expected for the standard model Higgs boson. The combined best-fit signal relative to the standard model expectation is 1.00\u00b10.09(stat)^(+0.08)_(\u22120.07)(theo)\u00b10.07(syst) at the measured mass. The couplings of the Higgs boson are probed for deviations in magnitude from the standard model predictions in multiple ways, including searches for invisible and undetected decays. No significant deviations are found.", "doi": "10.1140/epjc/s10052-015-3351-7", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-05-14", "series_number": "5", "volume": "75", "issue": "5", "pages": "Art. No. 212" }, { "id": "authors:6f8w0-hw091", "collection": "authors", "collection_id": "6f8w0-hw091", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150602-120358273", "type": "article", "title": "Search for a standard model-like Higgs boson in the \u03bc^+\u03bc^\u2212and e^+e^\u2212decay channels at the LHC", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for a standard model-like Higgs boson decaying to the \u03bc^+\u03bc^- or e^+e^\u2212 final states based on proton\u2013proton collisions recorded by the CMS experiment at the CERN LHC. The data correspond to integrated luminosities of 5.0 fb^(\u22121) at a centre-of-mass energy of 7 TeV and 19.7 fb^(\u22121) at 8 TeV for the \u03bc^+\u03bc^\u2212 search, and of 19.7 fb^(\u22121) at 8 TeV for the e^+e^\u2212 search. Upper limits on the production cross section times branching fraction at the 95% confidence level are reported for Higgs boson masses in the range from 120 to 150 GeV. For a Higgs boson with a mass of 125 GeV decaying to \u03bc^+\u03bc^\u2212, the observed (expected) upper limit on the production rate is found to be 7.4 6.5_(\u22121.9)^(+2.8)) times the standard model value. This corresponds to an upper limit on the branching fraction of 0.0016. Similarly, for e^+e^\u2212, an upper limit of 0.0019 is placed on the branching fraction, which is \u22483.7\u00d710^5 times the standard model value. These results, together with recent evidence of the 125 GeV boson coupling to \u03c4-leptons with a larger branching fraction consistent with the standard model, confirm that the leptonic couplings of the new boson are not flavour-universal.", "doi": "10.1016/j.physletb.2015.03.048", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-05-11", "volume": "744", "pages": "184-207" }, { "id": "authors:v9p8t-8ge71", "collection": "authors", "collection_id": "v9p8t-8ge71", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150623-092110141", "type": "article", "title": "Study of final-state radiation in decays of Z bosons produced in pp collisions at 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The differential cross sections for the production of photons in Z\u2192\u03bc + \u03bc \u2212 \u03b3 decays are presented as a function of the transverse energy of the photon and its separation from the nearest muon. The data for these measurements are collected with the CMS detector and correspond to an integrated luminosity of 4.7\u2009\u2009fb^(\u22121) of pp collisions at \u221as = 7\u2009\u2009TeV delivered by the CERN LHC. The cross sections are compared to simulations with POWHEG and PYTHIA, where PYTHIA is used to simulate parton showers and final-state photons. These simulations match the data to better than 5%.", "doi": "10.1103/PhysRevD.91.092012", "issn": "1550-7998", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-05-01", "series_number": "9", "volume": "91", "issue": "9", "pages": "Art. No. 092012" }, { "id": "authors:e8d2w-ate74", "collection": "authors", "collection_id": "e8d2w-ate74", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150622-125409344", "type": "article", "title": "Search for physics beyond the standard model in final states with a lepton and missing transverse energy in proton-proton collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics in proton-proton collisions having final states with an electron or muon and missing transverse energy is presented. The analysis uses data collected in 2012 with the CMS detector, at an LHC center-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121). No significant deviation of the transverse mass distribution of the charged lepton-neutrino system from the standard model prediction is found. Mass exclusion limits of up to 3.28 TeV at 95% confidence level for a W \u2032-boson with the same couplings as that of the standard model W-boson are determined. Results are also derived in the framework of split universal extra dimensions, and exclusion limits on Kaluza\u2013Klein W^ (2)_KK states are found. The final state with large missing transverse energy also enables a search for dark matter production with a recoiling W -boson, with limits set on the mass and the production cross section of potential candidates. Finally, limits are established for a model including interference between a left-handed W \u2032-boson and the standard model W-boson and for a compositeness model.", "doi": "10.1103/PhysRevD.91.092005", "issn": "1550-7998", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-05-01", "series_number": "9", "volume": "91", "issue": "9", "pages": "Art. No. 092005" }, { "id": "authors:rjwvg-79x91", "collection": "authors", "collection_id": "rjwvg-79x91", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150702-092657170", "type": "article", "title": "Measurement of the inclusive 3-jet production differential cross section in proton\u2013proton collisions at 7 TeV and determination of the strong coupling constant in the TeV range", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper presents a measurement of the inclusive 3-jet production differential cross section at a proton\u2013proton centre-of-mass energy of 7 TeV using data corresponding to an integrated luminosity of 5fb^(\u22121) collected with the CMS detector. The analysis is based on the three jets with the highest transverse momenta. The cross section is measured as a function of the invariant mass of the three jets in a range of 445\u20133270 GeV and in two bins of the maximum rapidity of the jets up to a value of 2. A comparison between the measurement and the prediction from perturbative QCD at next-to-leading order is performed. Within uncertainties, data and theory are in agreement. The sensitivity of the observable to the strong coupling constant \u03b1_S is studied. A fit to all data points with 3-jet masses larger than 664 GeV gives a value of the strong coupling constant of \u03b1_S (M Z )=0.1171\u00b10.0013(exp) ^(+0.0073)_(\u22120.0047)(theo).", "doi": "10.1140/epjc/s10052-015-3376-y", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-05-01", "series_number": "5", "volume": "75", "issue": "5", "pages": "Art. No. 186" }, { "id": "authors:y27j0-s2q80", "collection": "authors", "collection_id": "y27j0-s2q80", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150306-105543392", "type": "article", "title": "Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at \u221asNN = 5.02 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at \u221asNN = 5.02 TeV, in the range 0.4 < p_T < 120 GeV/c and pseudorapidity \u2502\u03b7_(CM)\u2502 < 1.8 in the proton-nucleon center-of-mass frame. For p_T < 10 GeV/c, the charged-particle production is asymmetric about \u03b7_(CM) = 0, with smaller yield observed in the direction of the proton beam, qualitatively consistent with expectations from shadowing in nuclear parton distribution functions (nPDF). A pp reference spectrum at \u221as = 5.02 TeV is obtained by interpolation from previous measurements at higher and lower center-of-mass energies. The p_T distribution measured in pPb collisions shows an enhancement of charged\nparticles with p_T > 20 GeV/c compared to expectations from the pp reference. The enhancement is larger than predicted by perturbative quantum chromodynamic calculations that include antishadowing modifications of nPDFs.", "doi": "10.1140/epjc/s10052-015-3435-4", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-05", "series_number": "5", "volume": "75", "issue": "5", "pages": "Art. No. 237" }, { "id": "authors:1p1mk-n3949", "collection": "authors", "collection_id": "1p1mk-n3949", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150707-151605930", "type": "article", "title": "Search for decays of stopped long-lived particles produced\n in proton\u2013proton collisions at \u221as = 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton\u2013proton collisions. Using a data set corresponding to an integrated luminosity of 18.6fb^(-1) of 8TeV proton\u2013proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13.2^(+3.6)_(\u22122.5) events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass \u22721000GeV and a top squark with mass \u2272525GeV are excluded, for lifetimes between 1 \u03bcs and 1000s. These results are the most stringent constraints on stopped particles to date.", "doi": "10.1140/epjc/s10052-015-3367-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-04-11", "series_number": "4", "volume": "75", "issue": "4", "pages": "Art. No. 151" }, { "id": "authors:aq767-qzf58", "collection": "authors", "collection_id": "aq767-qzf58", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150707-143520589", "type": "article", "title": "Measurements of differential and double-differential Drell-Yan\n cross sections in proton-proton collisions at \u221as = 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the differential and double-differential Drell\u2013Yan cross sections in the dielectron and dimuon channels are presented. They are based on proton\u2013proton collision data at \u221as=8TeV recorded with the CMS detector at the LHC and corresponding to an integrated luminosity of 19.7fb^(\u22121). The measured inclusive cross section in the Z peak region (60\u2013120GeV), obtained from the combination of the dielectron and dimuon channels, is 1138 \u00b1 8 (exp) \u00b1 25 (theo) \u00b1 30(lumi)\\,pb, where the statistical uncertainty is negligible. The differential cross section d\u03c3/dm in the dilepton mass range 15\u20132000GeV is measured and corrected to the full phase space. The double-differential cross section d^2\u03c3/dm d|y| is also measured over the mass range 20 to 1500GeV and absolute dilepton rapidity from 0 to 2.4. In addition, the ratios of the normalized differential cross sections measured at \u221as=7 and 8TeV are presented. These measurements are compared to the predictions of perturbative QCD at next-to-leading and next-to-next-to-leading (NNLO) orders using various sets of parton distribution functions (PDFs). The results agree with the NNLO theoretical predictions computed with fewz 3.1 using the CT10 NNLO and NNPDF2.1 NNLO PDFs. The measured double-differential cross section and ratio of normalized differential cross sections are sufficiently precise to constrain the proton PDFs.", "doi": "10.1140/epjc/s10052-015-3364-2", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-04-09", "series_number": "4", "volume": "75", "issue": "4", "pages": "Art. No. 147" }, { "id": "authors:5mk4z-pkb10", "collection": "authors", "collection_id": "5mk4z-pkb10", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150515-082709331", "type": "article", "title": "Search for stealth supersymmetry in events with jets, either photons or leptons, and low missing transverse momentum in pp collisions at 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "The results of a search for new physics in final states with jets, either photons or leptons, and low missing transverse momentum are reported. The study is based on a sample of proton\u2013proton collisions collected at a center-of-mass energy \u221as=8 TeV with the CMS detector in 2012. The integrated luminosity of the sample is 19.7 fb^(\u22121). Many models of new physics predict the production of events with jets, electroweak gauge bosons, and little or no missing transverse momentum. Examples include stealth models of supersymmetry (SUSY), which predict a hidden sector at the electroweak energy scale in which SUSY is approximately conserved. The data are used to search for stealth SUSY signatures in final states with either two photons or an oppositely charged electron and muon. No excess is observed with respect to the standard model expectation, and the results are used to set limits on squark pair production in the stealth SUSY framework.", "doi": "10.1016/j.physletb.2015.03.017", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-04-09", "volume": "743", "pages": "503-525" }, { "id": "authors:em5xb-03a13", "collection": "authors", "collection_id": "em5xb-03a13", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150515-104921751", "type": "article", "title": "Measurement of the production cross section ratio \u03c3(_(\u03c7b2)(1P))/\u03c3(\u03c7_(b1)(1P)) in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the production cross section ratio \u03c3(\u03c7_(b2)(1P))/\u03c3(\u03c7_(b1)(1P)) is presented. The \u03c7_(b1)(1P) and \u03c7_(b2)(1P) bottomonium states, promptly produced in pp collisions at \u221as=8 TeV, are detected by the CMS experiment at the CERN LHC through their radiative decays \u03c7b_(1,2)(1P)\u2192\u03d2(1S)+\u03b3. The emitted photons are measured through their conversion to e^+e^\u2212 pairs, whose reconstruction allows the two states to be resolved. The \u03d2(1S) is measured through its decay to two muons. An event sample corresponding to an integrated luminosity of 20.7 fb^(\u22121) is used to measure the cross section ratio in a phase-space region defined by the photon pseudorapidity, |\u03b7^\u03b3|<1.0; the \u03d2(1S) rapidity, |y^\u03d2|<1.5; and the \u03d2(1S) transverse momentum, 7", "doi": "10.1016/j.physletb.2015.02.048", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-04-09", "volume": "743", "pages": "383-402" }, { "id": "authors:1z1tm-m8947", "collection": "authors", "collection_id": "1z1tm-m8947", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150805-114445237", "type": "article", "title": "Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0002-9730-9463", "clpid": "Chen-Yanbei" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Dimuon and dielectron mass spectra, obtained from data resulting from proton-proton collisions at 8 TeV and recorded by the CMS experiment, are used to search for both narrow resonances and broad deviations from standard model predictions. The data correspond to an integrated luminosity of 20.6 (19.7) fb^(\u22121) for the dimuon (dielectron) channel. No evidence for non-standard-model physics is observed and 95% confidence level limits are set on parameters from a number of new physics models. The narrow resonance analyses exclude a Sequential Standard Model Z'_(SSM) resonance lighter than 2.90 TeV, a superstring-inspired Z'_\u03c8 lighter than 2.57 TeV, and Randall-Sundrum Kaluza-Klein gravitons with masses below 2.73, 2.35, and 1.27 TeV for couplings of 0.10, 0.05, and 0.01, respectively. A notable feature is that the limits have been calculated in a model-independent way to enable straightforward reinterpretation in any model predicting a resonance structure. The observed events are also interpreted within the framework of two non-resonant analyses: one based on a large extra dimensions model and one based on a quark and lepton compositeness model with a left-left isoscalar contact interaction. Lower limits are established on MS, the scale characterizing the onset of quantum gravity, which range from 4.9 to 3.3 TeV, where the number of additional spatial dimensions varies from 3 to 7. Similarly, lower limits on \u039b, the energy scale parameter for the contact interaction, are found to be 12.0 (15.2) TeV for destructive (constructive) interference in the dimuon channel and 13.5 (18.3) TeV in the dielectron channel.", "doi": "10.1007/JHEP04(2015)025", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-04-07", "series_number": "4", "volume": "2015", "issue": "4", "pages": "Art. No. 25" }, { "id": "authors:k5evg-ert19", "collection": "authors", "collection_id": "k5evg-ert19", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150407-113149547", "type": "article", "title": "Measurement of the top-quark mass in all-jets tt events in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0002-9730-9463", "clpid": "Chen-Yanbei" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The mass of the top quark is measured using a sample of tt candidate events with at least six jets in the final state. The sample is selected from data collected with the CMS detector in pp collisions at \u221as = 7 TeV in 2011 and corresponds to an integrated luminosity of 3.54 fb^(\u22121). The mass is reconstructed for each event employing a kinematic fit of the jets to a tt hypothesis. The top-quark mass is measured to be 173.49\u00b10.69(stat.)\u00b11.21(syst.) GeV. A combination with previously published measurements in other decay modes by CMS yields a mass of 173.54\u00b10.33(stat.)\u00b10.96(syst.) GeV.", "doi": "10.1140/epjc/s10052-014-2758-x", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-04-04", "series_number": "4", "volume": "74", "issue": "4", "pages": "Art. No. 2758" }, { "id": "authors:7rmz7-c2z29", "collection": "authors", "collection_id": "7rmz7-c2z29", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150227-144613329", "type": "article", "title": "Measurement of the Z\u03b3 production cross section in pp collisions at 8 TeV and search for anomalous triple gauge boson couplings", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The cross section for the production of Z\u03b3 in proton-proton collisions at 8 TeV is measured based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 19.5 fb^(\u22121). Events with an oppositely-charged pair of muons or electrons together with an isolated photon are selected. The differential cross section as a function of the photon transverse momentum is measured inclusively and exclusively, where the exclusive selection applies a veto on central jets. The observed cross sections are compatible with the expectations of next-to-next-to-leading-order quantum chromodynamics. Limits on anomalous triple gauge couplings of ZZ\u03b3 and\nZ\u03b3\u03b3 are set that improve on previous experimental results obtained with the charged lepton decay modes of the Z boson.", "doi": "10.1007/JHEP04(2015)164", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-04", "series_number": "4", "volume": "2015", "issue": "4", "pages": "Art. No. 164" }, { "id": "authors:p9wpb-z7n71", "collection": "authors", "collection_id": "p9wpb-z7n71", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150504-093349872", "type": "article", "title": "Search for Monotop Signatures in Proton-Proton Collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for new decaying massive particles whose presence is inferred from an imbalance in transverse momentum and which are produced in association with a single top quark that decays into a bottom quark and two light quarks. The measurement is performed using 19.7\u2009\u2009fb^(\u22121) of data from proton-proton collisions at a center-of-mass energy of 8 TeV, collected with the CMS detector at the CERN LHC. No deviations from the standard model predictions are observed and lower limits are set on the masses of new invisible bosons. In particular, scalar and vector particles, with masses below 330 and 650 GeV, respectively, are excluded at 95% confidence level, thereby substantially extending a previous limit published by the CDF Collaboration.", "doi": "10.1103/PhysRevLett.114.101801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2015-03-13", "series_number": "10", "volume": "114", "issue": "10", "pages": "Art. No. 101801" }, { "id": "authors:4yt3h-37517", "collection": "authors", "collection_id": "4yt3h-37517", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150413-112014328", "type": "article", "title": "Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of two-particle angular correlations between an identified strange hadron (K_S^0 or \u039b/\u039b) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 nb^(\u22121), were collected at a nucleon\u2013nucleon center-of-mass energy (\u221asNN) of 5.02 TeV with the CMS detector at the LHC. The results are compared to semi-peripheral PbPb collision data at \u221asNN=2.76 TeV, covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order (v_2) and third-order (v_3) anisotropy harmonics of K_S^0 and \u039b/\u039b particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of v_2 and v_3 is observed. For pT<2 GeV GeV, the v_2 and v_3 values of K_S^0 particles are larger than those of \u039b/\u039b particles at the same p_T. This splitting effect between two particle species is found to be stronger in pPb than in PbPb collisions in the same multiplicity range. When divided by the number of constituent quarks and compared at the same transverse kinetic energy per quark, both v_2 and v_3 for K_S^0 particles are observed to be consistent with those for \u039b/\u039b particles at the 10% level in pPb collisions. This consistency extends over a wide range of particle transverse kinetic energy and event multiplicities.", "doi": "10.1016/j.physletb.2015.01.034", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-03-06", "volume": "742", "pages": "200-224" }, { "id": "authors:h4taf-mvs89", "collection": "authors", "collection_id": "h4taf-mvs89", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150421-110842855", "type": "article", "title": "Study of Z production in PbPb and pp collisions at \u221asNN = 2.76 TeV in the dimuon and dielectron decay channels", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of Z bosons is studied in the dimuon and dielectron decay channels in PbPb and pp collisions at sNN = 2.76 TeV, using data collected by the CMS experiment at the LHC. The PbPb data sample corresponds to an integrated luminosity of about 166 \u03bcb^(\u22121), while the pp data sample collected in 2013 at the same nucleon-nucleon centre-of-mass energy has an integrated luminosity of 5.4 pb^(\u22121). The Z boson yield is measured as a function of rapidity, transverse momentum, and collision centrality. The ratio of PbPb to pp yields, scaled by the number of inelastic nucleon-nucleon collisions, is found to be 1.06 \u00b1 0.05 (stat) \u00b1 0.08 (syst) in the dimuon channel and 1.02 \u00b1 0.08 (stat) \u00b1 0.15 (syst) in the dielectron channel, for centrality-integrated Z boson production. This binary collision scaling is seen to hold in the entire kinematic region studied, as expected for a colourless probe that is unaffected by the hot and dense QCD medium produced in heavy ion collisions.", "doi": "10.1007/JHEP03(2015)022", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-03-04", "series_number": "3", "volume": "2015", "issue": "3", "pages": "Art. No. 22" }, { "id": "authors:2rtpm-cxr36", "collection": "authors", "collection_id": "2rtpm-cxr36", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150421-152248886", "type": "article", "title": "Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0002-9730-9463", "clpid": "Chen-Yanbei" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for resonances and quantum black holes is performed using the dijet mass spectra measured in proton-proton collisions at s\u221a=8\u2009\u2009TeV with the CMS detector at the LHC. The data set corresponds to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121). In a search for narrow resonances that couple to quark-quark, quark-gluon, or gluon-gluon pairs, model-independent upper limits, at 95% confidence level, are obtained on the production cross section of resonances, with masses above 1.2 TeV. When interpreted in the context of specific models the limits exclude string resonances with masses below 5.0 TeV; excited quarks below 3.5 TeV; scalar diquarks below 4.7 TeV; W\u2032 bosons below 1.9 TeV or between 2.0 and 2.2 TeV; Z\u2032 bosons below 1.7 TeV; and Randall-Sundrum gravitons below 1.6 TeV. A separate search is conducted for narrow resonances that decay to final states including b quarks. The first exclusion limit is set for excited b quarks, with a lower mass limit between 1.2 and 1.6 TeV depending on their decay properties. Searches are also carried out for wide resonances, assuming for the first time width-to-mass ratios up to 30%, and for quantum black holes with a range of model parameters. The wide resonance search excludes axigluons and colorons with mass below 3.6 TeV, and color-octet scalars with mass below 2.5 TeV. Lower bounds between 5.0 and 6.3 TeV are set on the masses of quantum black holes.", "doi": "10.1103/PhysRevD.91.052009", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-03-01", "series_number": "5", "volume": "91", "issue": "5", "pages": "Art. No. 052009" }, { "id": "authors:rf4hj-2zy03", "collection": "authors", "collection_id": "rf4hj-2zy03", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150414-075718262", "type": "article", "title": "Measurements of jet multiplicity and differential production cross sections of Z+jets events in proton-proton collisions at \u221as=7\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of differential cross sections are presented for the production of a Z boson and at least one hadronic jet in proton-proton collisions at \u221as=7\u2009\u2009TeV, recorded by the CMS detector, using a data sample corresponding to an integrated luminosity of 4.9\u2009\u2009fb^(\u22121). The jet multiplicity distribution is measured for up to six jets. The differential cross sections are measured as a function of jet transverse momentum and pseudorapidity for the four highest transverse momentum jets. The distribution of the scalar sum of jet transverse momenta is also measured as a function of the jet multiplicity. The measurements are compared with theoretical predictions at leading and next-to-leading order in perturbative QCD.", "doi": "10.1103/PhysRevD.91.052008", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-03-01", "series_number": "5", "volume": "91", "issue": "5", "pages": "Art. No. 052008" }, { "id": "authors:5f52j-5w223", "collection": "authors", "collection_id": "5f52j-5w223", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150424-144452967", "type": "article", "title": "Search for supersymmetry using razor variables in events with b-tagged jets in pp collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "Si", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "An inclusive search for supersymmetry in events with at least one b-tagged jet is performed using proton-proton collision data collected by the CMS experiment in 2012 at a center-of-mass energy of 8 TeV. The data set size corresponds to an integrated luminosity of 19.3\u2009\u2009fb^(\u22121). The two-dimensional distribution of the razor variables R^2 and M _R is studied in events with and without leptons. The data are found to be consistent with the expected background, which is modeled with an empirical function. Exclusion limits on supersymmetric particle masses at a 95% confidence level are derived in several simplified supersymmetric scenarios for several choices of the branching fractions. By combining the likelihoods of a search in events without leptons and a search that requires a single lepton (electron or muon), an improved bound on the top-squark mass is obtained. Assuming the lightest supersymmetric particle to be stable and weakly interacting, and to have a mass of 100 GeV, the branching-fraction-dependent (-independent) production of gluinos is excluded for gluino masses up to 1310 (1175) GeV. The corresponding limit for top-squark pair production is 730 (645) GeV.", "doi": "10.1103/PhysRevD.91.052018", "issn": "1550-7998", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-03-01", "series_number": "5", "volume": "91", "issue": "5", "pages": "Art. No. 052018" }, { "id": "authors:satsv-wwe39", "collection": "authors", "collection_id": "satsv-wwe39", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150501-142234525", "type": "article", "title": "Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for long-lived particles that decay into final states that include a pair of electrons or a pair of muons. The experimental signature is a distinctive topology consisting of a pair of charged leptons originating from a displaced secondary vertex. Events corresponding to an integrated luminosity of 19.6\u2009(20.5)\u2009\u2009fb^(\u22121) in the electron (muon) channel were collected with the CMS detector at the CERN LHC in proton-proton collisions at \u221as=8\u2009\u2009TeV. No significant excess is observed above standard model expectations. Upper limits on the product of the cross section and branching fraction of such a signal are presented as a function of the long-lived particle's mean proper decay length. The limits are presented in an approximately model-independent way, allowing them to be applied to a wide class of models yielding the above topology. Over much of the investigated parameter space, the limits obtained are the most stringent to date. In the specific case of a model in which a Higgs boson in the mass range 125\u20131000\u2009\u2009GeV/c^2 decays into a pair of long-lived neutral bosons in the mass range 20\u2013350\u2009\u2009GeV/c^2, each of which can then decay to dileptons, the upper limits obtained are typically in the range 0.2\u201310 fb for mean proper decay lengths of the long-lived particles in the range 0.01\u2013100 cm. In the case of the lowest Higgs mass considered (125\u2009\u2009GeV/c^2), the limits are in the range 2\u201350 fb. These limits are sensitive to Higgs boson branching fractions as low as 10^(\u22124).", "doi": "10.1103/PhysRevD.91.052012", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-03-01", "series_number": "5", "volume": "91", "issue": "5", "pages": "Art. No. 052012" }, { "id": "authors:34077-pgb61", "collection": "authors", "collection_id": "34077-pgb61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150421-134725345", "type": "article", "title": "Search for Displaced Supersymmetry in Events with an Electron and a Muon with Large Impact Parameters", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new long-lived particles decaying to leptons is presented using proton-proton collisions produced by the LHC at \u221as=8\u2009\u2009TeV. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121). Events are selected with an electron and muon with opposite charges that both have transverse impact parameter values between 0.02 and 2 cm. The search has been designed to be sensitive to a wide range of models with nonprompt e\u2212\u03bc final states. Limits are set on the \"displaced supersymmetry\" model, with pair production of top squarks decaying into an e\u2212\u03bc final state via R-parity-violating interactions. The results are the most restrictive to date on this model, with the most stringent limit being obtained for a top squark lifetime corresponding to c\u03c4=2\u2009\u2009cm, excluding masses below 790 GeV at 95% confidence level.", "doi": "10.1103/PhysRevLett.114.061801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2015-02-13", "series_number": "6", "volume": "114", "issue": "6", "pages": "Art. No. 061801" }, { "id": "authors:1b9dt-1qk70", "collection": "authors", "collection_id": "1b9dt-1qk70", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150622-112317340", "type": "article", "title": "Measurement of electroweak production of two jets in association with a Z boson in proton\u2013proton collisions at \u221as = 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The purely electroweak (EW) cross section for the production of two jets in association with a Z boson, in proton\u2013proton collisions at \u221a s = 8TeV, is measured using data recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 19.7fb ^(-1). The electroweak cross section for the \u2113\u2113jj final state (with \u2113=e or \u03bc and j representing the quarks produced in the hard interaction) in the kinematic region defined by M \u2113\u2113 >50 GeV, M jj >120 GeV, transverse momentum p_( Tj) >25 GeV, and pseudorapidity |\u03b7_ j |<5, is found to be \u03c3_( EW) (\u2113\u2113jj)=174\u00b115(stat)\u00b140(syst)\\,fb, in agreement with the standard model prediction. The associated jet activity of the selected events is studied, in particular in a signal-enriched region of phase space, and the measurements are found to be in agreement with QCD predictions.", "doi": "10.1140/epjc/s10052-014-3232-5", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2015-02-10", "series_number": "2", "volume": "75", "issue": "2", "pages": "Art. No. 66" }, { "id": "authors:c3709-nbt69", "collection": "authors", "collection_id": "c3709-nbt69", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150327-105844752", "type": "article", "title": "Study of Vector Boson Scattering and Search for New Physics in Events with Two Same-Sign Leptons and Two Jets", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A study of vector boson scattering in pp collisions at a center-of-mass energy of 8 TeV is presented. The data sample corresponds to an integrated luminosity of 19.4\u2009\u2009fb^(\u22121) collected with the CMS detector. Candidate events are selected with exactly two leptons of the same charge, two jets with large rapidity separation and high dijet mass, and moderate missing transverse energy. The signal region is expected to be dominated by electroweak same-sign W-boson pair production. The observation agrees with the standard model prediction. The observed significance is 2.0 standard deviations, where a significance of 3.1 standard deviations is expected based on the standard model. Cross section measurements for W^\u00b1W^\u00b1 and WZ processes in the fiducial region are reported. Bounds on the structure of quartic vector-boson interactions are given in the framework of dimension-eight effective field theory operators, as well as limits on the production of doubly charged Higgs bosons.", "doi": "10.1103/PhysRevLett.114.051801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2015-02-06", "series_number": "5", "volume": "114", "issue": "5", "pages": "Art. No. 051801" }, { "id": "authors:ma69q-tt481", "collection": "authors", "collection_id": "ma69q-tt481", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150310-083051503", "type": "article", "title": "Differential cross section measurements for the production of a W boson in association with jets in proton\u2013proton collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (p_T) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (H_T), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb^(\u22121). The measured cross sections are compared to predictions from Monte Carlo generators, MADGRAPH + PYTHIA and SHERPA, and to next-to-leading-order calculations from BLACKHAT + SHERPA. The differential cross sections are found to be in agreement with the predictions, apart from the pTpT distributions of the leading jets at high p_T values, the distributions of the H_T at high-H_T and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.", "doi": "10.1016/j.physletb.2014.12.003", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-02-04", "volume": "741", "pages": "12-37" }, { "id": "authors:q83bk-dq865", "collection": "authors", "collection_id": "q83bk-dq865", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150420-115455946", "type": "article", "title": "Performance of the CMS missing transverse momentum reconstruction in pp data at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The performance of missing transverse energy reconstruction algorithms is presented using \u221as=8 TeV proton-proton (pp) data collected with the CMS detector. Events with anomalous missing transverse energy are studied, and the performance of algorithms used to identify and remove these events is presented. The scale and resolution for missing transverse energy, including the effects of multiple pp interactions (pileup), are measured using events with an identified Z boson or isolated photon, and are found to be well described by the simulation. Novel missing transverse energy reconstruction algorithms developed specifically to mitigate the effects of large numbers of pileup interactions on the missing transverse energy resolution are presented. These algorithms significantly reduce the dependence of the missing transverse energy resolution on pileup interactions. Finally, an algorithm that provides an estimate of the significance of the missing transverse energy is presented, which is used to estimate the compatibility of the reconstructed missing transverse energy with a zero nominal value.", "doi": "10.1088/1748-0221/10/02/P02006", "issn": "1748-0221", "publisher": "International School of Advanced Studies", "publication": "Journal of Instrumentation", "publication_date": "2015-02", "series_number": "2", "volume": "10", "issue": "2", "pages": "Art. No. P02006" }, { "id": "authors:wqs9x-gz648", "collection": "authors", "collection_id": "wqs9x-gz648", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150317-120300218", "type": "article", "title": "Search for long-lived neutral particles decaying to quark-antiquark pairs in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for long-lived massive neutral particles decaying to quark-antiquark pairs. The experimental signature is a distinctive topology of a pair of jets, originating at a secondary vertex. Events were collected with the CMS detector at the CERN LHC in proton-proton collisions at a center-of-mass energy of 8 TeV. The data analyzed correspond to an integrated luminosity of 18.5\u2009\u2009fb^(\u22121). No significant excess is observed above standard model expectations. Upper limits at 95% confidence level are set on the production cross section of a heavy neutral scalar particle, H, in the mass range of 200 to 1000 GeV, decaying promptly into a pair of long-lived neutral X particles in the mass range of 50 to 350 GeV, each in turn decaying into a quark-antiquark pair. For X with mean proper decay lengths of 0.4 to 200 cm, the upper limits are typically 0.5\u2013200\u2009\u2009fb. The results are also interpreted in the context of an R-parity-violating supersymmetric model with long-lived neutralinos decaying into a quark-antiquark pair and a muon. For pair production of squarks that promptly decay to neutralinos with mean proper decay lengths of 2\u201340\u2009\u2009cm, the upper limits on the cross section are typically 0.5\u20133\u2009\u2009fb. The above limits are the most stringent on these channels to date.", "doi": "10.1103/PhysRevD.91.012007", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2015-01-20", "series_number": "1", "volume": "91", "issue": "1", "pages": "Art. No. 012007" }, { "id": "authors:2dh4q-9zx90", "collection": "authors", "collection_id": "2dh4q-9zx90", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150304-111021299", "type": "article", "title": "Search for disappearing tracks in proton-proton collisions at s\u221a=8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Pierini", "given_name": "M.", "orcid": "0000-0003-1939-4268", "clpid": "Pierini-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" } ], "abstract": "A search is presented for long-lived charged particles that decay within the CMS detector and produce the signature of a disappearing track. Disappearing tracks are identified as those with little or no associated calorimeter energy deposits and with missing hits in the outer layers of the tracker. The search uses proton-proton collision data recorded at s\u221a=8 TeV that corresponds to an integrated luminosity of 19.5 fb^(\u22121). The results of the search are interpreted in the context of the anomaly-mediated supersymmetry breaking (AMSB) model. The number of observed events is in agreement with the background expectation, and limits are set on the cross section of direct electroweak chargino production in terms of the chargino mass and mean proper lifetime. At 95% confidence level, AMSB models with a chargino mass less than 260 GeV, corresponding to a mean proper lifetime of 0.2 ns, are excluded.", "doi": "10.1007/JHEP01(2015)096", "issn": "1029-8479", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-01-19", "series_number": "1", "volume": "2015", "issue": "1", "pages": "Art. No. 096" }, { "id": "authors:ddqvj-f5737", "collection": "authors", "collection_id": "ddqvj-f5737", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150219-083526370", "type": "article", "title": "Search for new resonances decaying via WZ to leptons in proton\u2013proton collisions at \u221as=8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed in proton\u2013proton collisions at \u221as=8 TeV for exotic particles decaying via WZ to fully leptonic final states with electrons, muons, and neutrinos. The data set corresponds to an integrated luminosity of 19.5 fb^(\u22121). No significant excess is observed above the expected standard model background. Upper bounds at 95% confidence level are set on the production cross section of a W\u2032 boson as predicted by an extended gauge model, and on the W\u2032WZ coupling. The expected and observed mass limits for a W\u2032 boson, as predicted by this model, are 1.55 and 1.47 TeV, respectively. Stringent limits are also set in the context of low-scale technicolor models under a range of assumptions for the model parameters.", "doi": "10.1016/j.physletb.2014.11.026", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-01-05", "volume": "740", "pages": "83-104" }, { "id": "authors:xc0q6-wrd76", "collection": "authors", "collection_id": "xc0q6-wrd76", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150219-112421122", "type": "article", "title": "Measurement of the pp\u2192ZZ production cross section and constraints on anomalous triple gauge couplings in four-lepton final states at \u221as=8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the inclusive ZZ production cross section and constraints on anomalous triple gauge couplings in proton\u2013proton collisions at \u221as=8TeV are presented. The analysis is based on a data sample, corresponding to an integrated luminosity of 19.6 fb^(\u22121), collected with the CMS experiment at the LHC. The measurements are performed in the leptonic decay modes ZZ\u2192\u2113\u2113\u2113\u2032\u2113\u2032, where \u2113=e,\u03bc and \u2113\u2032=e,\u03bc,\u03c4. The measured total cross section \u03c3(pp\u2192ZZ)=7.7\u00b10.5 (stat)\u22120.4+0.5 (syst)\u00b10.4(theo)\u00b10.2 (lumi) pb, for both Z bosons produced in the mass range 60", "doi": "10.1016/j.physletb.2014.11.059", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2015-01-05", "volume": "740", "pages": "250-272" }, { "id": "authors:n44ma-nw232", "collection": "authors", "collection_id": "n44ma-nw232", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151120-085450452", "type": "article", "title": "Measurement of the ratio of the production cross sections times branching fractions of B^\u00b1_c \u2192 J/\u03c8\u03c0^\u00b1 and B^\u00b1 \u2192 J/\u03c8K^\u00b1 and B(B^\u00b1_c \u2192 J/\u03c8\u03c0^\u00b1\u03c0^\u00b1\u03c0^\u2213)/B(B^\u00b1_c \u2192 J/\u03c8\u03c0^\u00b1) in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The ratio of the production cross sections times branching fractions (\u03c3(B\u00b1c)B(B^\u00b1_c \u2192 J/\u03c8\u03c0^\u00b1))\u03c3(B\u00b1)B(B\u00b1 \u2192 J/\u03c8K^\u00b1))\nis studied in proton-proton collisions at a center-of-mass energy of 7TeV with the CMS detector at the LHC. The kinematic region investigated requires B^\u00b1_c and B^\u00b1 mesons with transverse momentum p_T > 15 GeV and rapidity |y| < 1.6. The data sample corresponds to an integrated luminosity of 5.1 fb^(\u22121). The ratio is determined to be [0.48 \u00b1 0.05 (stat) \u00b1 0.03 (syst) \u00b1 0.05 (T_B_c)]%.\nThe B^\u00b1_c \u2192 J/\u03c8\u03c0^\u00b1\u03c0^\u00b1\u03c0^\u2213 decay is also observed in the same data sample. Using a model-independent method developed to measure the efficiency given the presence of resonant behaviour in the three-pion system, the ratio of the branching fractions B(B^\u00b1_c \u2192 J/\u03c8\u03c0^\u00b1\u03c0^\u00b1\u03c0^\u2213)/B(B^\u00b1_c \u2192 J/\u03c8\u03c0^\u00b1) is measured to be 2.55\u00b10.80 (stat)\u00b10.33 (syst)^(+0.04)_(\u22120.01) (T_B_c ), consistent with the previous LHCb result.", "doi": "10.1007/JHEP01(2015)063", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-01", "series_number": "1", "volume": "2015", "issue": "1", "pages": "Art. No. 63" }, { "id": "authors:td1wk-jkw29", "collection": "authors", "collection_id": "td1wk-jkw29", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150324-162255843", "type": "article", "title": "Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Vlimant", "given_name": "J. R.", "clpid": "Vlimant-J-R" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the W boson helicity is presented, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. The data sample corresponds to an integrated luminosity of 19.7 fb^(\u22121). The measured helicity fractions are F_L = 0.298 \u00b1 0.028 (stat) \u00b1 0.032(syst), F_0 = 0.720 \u00b1 0.039 (stat) \u00b1 0.037(syst), and F_R = \u22120.018 \u00b1 0.019 (stat) \u00b1 0.011(syst). These results are used to set limits on the real part of the tWb anomalous couplings, g_L and g_R.", "doi": "10.1007/JHEP01(2015)053", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2015-01", "series_number": "1", "volume": "2015", "issue": "1", "pages": "Art. No. 053" }, { "id": "authors:spesr-2vz61", "collection": "authors", "collection_id": "spesr-2vz61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150327-112329661", "type": "article", "title": "Measurement of Prompt \u03c8(2S) to J=\u03c8 Yield Ratios in Pb-Pb and p-p Collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The ratio between the prompt \u03c8(2S) and J/\u03c8 yields, reconstructed via their decays into \u03bc^+\u03bc^\u2212, is measured in Pb-Pb and p-p collisions at \u221asNN = 2.76\u2009\u2009TeV. The analysis is based on Pb-Pb and p-p data samples collected by CMS at the Large Hadron Collider, corresponding to integrated luminosities of 150\u2009\u2009\u03bcb^(\u22121) and 5.4\u2009\u2009pb^(\u22121), respectively. The double ratio of measured yields (N\u03c8_((2S))/N_(J/\u03c8))_(Pb\u2212Pb)/(N_(\u03c8(2S))/N_(J/\u03c8))_(p\u2212p) is computed in three Pb-Pb collision centrality bins and two kinematic ranges: one at midrapidity, |y|<1.6, covering the transverse momentum range 6.5< p_T <30\u2009\u2009GeV/c, and the other at forward rapidity, 1.6< |y| <2.4, extending to lower p_T values, 3< p_T <30\u2009\u2009GeV/c. The centrality-integrated double ratio changes from 0.45\u00b10.13(stat)\u00b10.07(syst) in the first range to 1.67\u00b10.34(stat)\u00b10.27(syst) in the second. This difference is most pronounced in the most central collisions.", "doi": "10.1103/PhysRevLett.113.262301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2014-12-31", "series_number": "26", "volume": "113", "issue": "26", "pages": "Art. No. 262301" }, { "id": "authors:ndfe0-63n56", "collection": "authors", "collection_id": "ndfe0-63n56", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150220-095232619", "type": "article", "title": "Searches for heavy Higgs bosons in two-Higgs-doublet models and for t \u2192 ch decay using multilepton and diphoton final states in pp collisions at 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Searches are presented for heavy scalar (H) and pseudoscalar (A) Higgs bosons posited in the two doublet model (2HDM) extensions of the standard model (SM). These searches are based on a data sample of pp collisions collected with the CMS experiment at the LHC at a center-of-mass energy of \u221as=8\u2009\u2009TeV and corresponding to an integrated luminosity of 19.5\u2009fb^(\u22121). The decays H\u2192hh and A\u2192Zh, where h denotes an SM-like Higgs boson, lead to events with three or more isolated charged leptons or with a photon pair accompanied by one or more isolated leptons. The search results are presented in terms of the H and A production cross sections times branching fractions and are further interpreted in terms of 2HDM parameters. We place 95% C.L. cross section upper limits of approximately 7 pb on \u03c3B for H\u2192hh and 2 pb for A\u2192Zh. Also presented are the results of a search for the rare decay of the top quark that results in a charm quark and an SM Higgs boson, t\u2192ch, the existence of which would indicate a nonzero flavor-changing Yukawa coupling of the top quark to the Higgs boson. We place a 95% C.L. upper limit of 0.56% on B(t\u2192ch).", "doi": "10.1103/PhysRevD.90.112013", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-12-23", "series_number": "11", "volume": "90", "issue": "11", "pages": "Art. No. 112013" }, { "id": "authors:024h0-zb912", "collection": "authors", "collection_id": "024h0-zb912", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150109-135031041", "type": "article", "title": "Measurement of the tt production cross section in pp collisions at \u221as = 8 TeV in dilepton final states containing one \u03c4 lepton", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The top-quark pair production cross section is measured in final states with one electron or muon and one hadronically decaying \u03c4 lepton from the process tt\u2192(\u2113\u03bd_\u2113)(\u03c4\u03bd_\u03c4)bb, where \u2113=e,\u03bc. The data sample corresponds to an integrated luminosity of 19.6 fb^(\u22121) collected with the CMS detector in proton\u2013proton collisions at \u221as =8 TeV. The measured cross section \u03c3_(tt)=257\u00b13 (stat)\u00b124 (syst)\u00b17 (lumi) pb, assuming a top-quark mass of 172.5 GeV, is consistent with the standard model prediction.", "doi": "10.1016/j.physletb.2014.10.032", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-12-12", "volume": "739", "pages": "23-43" }, { "id": "authors:h5m70-d2d52", "collection": "authors", "collection_id": "h5m70-d2d52", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150109-143604946", "type": "article", "title": "Search for pair production of third-generation scalar leptoquarks and top squarks in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair production of third-generation scalar leptoquarks and supersymmetric top quark partners, top squarks, in final states involving tau leptons and bottom quarks is presented. The search uses events from a data sample of proton\u2013proton collisions corresponding to an integrated luminosity of 19.7 fb^(\u22121), collected with the CMS detector at the LHC with \u221as = 8 TeV. The number of observed events is found to be in agreement with the expected standard model background. Third-generation scalar leptoquarks with masses below 740 GeV are excluded at 95% confidence level, assuming a 100% branching fraction for the leptoquark decay to a tau lepton and a bottom quark. In addition, this mass limit applies directly to top squarks decaying via an R-parity violating coupling \u03bb'_(333). The search also considers a similar signature from top squarks undergoing a chargino-mediated decay involving the R-parity violating coupling \u03bb'_(3jk). Each top squark decays to a tau lepton, a bottom quark, and two light quarks. Top squarks in this model with masses below 580 GeV are excluded at 95% confidence level. The constraint on the leptoquark mass is the most stringent to date, and this is the first search for top squarks decaying via \u03bb'_(3jk).", "doi": "10.1016/j.physletb.2014.10.063", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-12-12", "volume": "739", "pages": "229-249" }, { "id": "authors:92ps9-xy935", "collection": "authors", "collection_id": "92ps9-xy935", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150121-090924848", "type": "article", "title": "Search for supersymmetry with razor variables in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The razor approach to search for R\u2013parity conserving supersymmetric particles is described in detail. Two analyses are considered: an inclusive search for new heavy particle pairs decaying to final states with at least two jets and missing transverse energy, and a dedicated search for final states with at least one jet originating from a bottom quark. For both the inclusive study and the study requiring a bottom-quark jet, the data are examined in exclusive final states corresponding to all-hadronic, single-lepton, and dilepton events. The study is based on the data set of proton-proton collisions at \u221as=7\u2009\u2009TeV collected with the CMS detector at the LHC in 2011, corresponding to an integrated luminosity of 4.7\u2009\u2009fb^(\u22121). The study consists of a shape analysis performed in the plane of two kinematic variables, denoted M_R and R^2, that correspond to the mass and transverse energy flow, respectively, of pair-produced, heavy, new-physics particles. The data are found to be compatible with the background model, defined by studying event simulations and data control samples. Exclusion limits for squark and gluino production are derived in the context of the constrained minimal supersymmetric standard model (CMSSM) and also for simplified-model spectra (SMS). Within the CMSSM parameter space considered, squark and gluino masses up to 1350 GeV are excluded at 95% confidence level, depending on the model parameters. For SMS scenarios, the direct production of pairs of top or bottom squarks is excluded for masses as high as 400 GeV.", "doi": "10.1103/PhysRevD.90.112001", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-12-01", "series_number": "11", "volume": "90", "issue": "11", "pages": "Art. No. 112001" }, { "id": "authors:x2yya-qwt74", "collection": "authors", "collection_id": "x2yya-qwt74", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150317-102348482", "type": "article", "title": "Identification techniques for highly boosted W bosons that decay into hadrons", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "In searches for new physics in the energy regime of the LHC, it is becoming increasingly important to distinguish single-jet objects that originate from the merging of the decay products of W bosons produced with high transverse momenta from jets initiated by single partons. Algorithms are defined to identify such W jets for different signals of interest, using techniques that are also applicable to other decays of bosons to hadrons that result in a single jet, such as those from highly boosted Z and Higgs bosons. The efficiency for tagging W jets is measured in data collected with the CMS detector at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb^(\u22121). The performance of W tagging in data is compared with predictions from several Monte Carlo simulators.", "doi": "10.1007/JHEP12(2014)017", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-12", "series_number": "12", "volume": "2014", "issue": "12", "pages": "Art. No. 017" }, { "id": "authors:j67pm-xwp65", "collection": "authors", "collection_id": "j67pm-xwp65", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150206-142050213", "type": "article", "title": "Measurement of differential cross sections for the production of a pair of isolated photons in pp collisions at \u221as = 7TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of differential cross sections for the production of a pair of isolated photons in proton\u2013proton collisions at \u221as = 7TeV is presented. The data sample corresponds to an integrated luminosity of 5.0 fb^(\u22121) collected with the CMS detector. A data-driven isolation template method is used to extract the prompt diphoton yield. The measured cross section for two isolated photons, with transverse energy above 40 and 25 GeV respectively, in the pseudorapidity range |\u03b7|<2.5, |\u03b7|\u2209[1.44,1.57] and with an angular separation \u0394R>0.45, is 17.2\u00b10.2(stat)\u00b11.9(syst)\u00b10.4(lumi)pb. Differential cross sections are measured as a function of the diphoton invariant mass, the diphoton transverse momentum, the azimuthal angle difference between the two photons, and the cosine of the polar angle in the Collins\u2013Soper reference frame of the diphoton system. The results are compared to theoretical predictions at leading, next-to-leading, and next-to-next-to-leading order in quantum chromodynamics.", "doi": "10.1140/epjc/s10052-014-3129-3", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-11-12", "series_number": "11", "volume": "74", "issue": "11", "pages": "Art. No. 3129" }, { "id": "authors:btdwx-rdb66", "collection": "authors", "collection_id": "btdwx-rdb66", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150105-142235164", "type": "article", "title": "Search for excited quarks in the \u03b3 + jet final state in proton\u2013proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for excited quarks decaying into the \u03b3+jet final state is presented. The analysis is based on data corresponding to an integrated luminosity of 19.7 fb^(\u22121) collected by the CMS experiment in proton\u2013proton collisions at \u221as = 8 TeV at the LHC. Events with photons and jets with high transverse momenta are selected and the \u03b3+jet invariant mass distribution is studied to search for a resonance peak. The 95% confidence level upper limits on the product of cross section and branching fraction are evaluated as a function of the excited quark mass. Limits on excited quarks are presented as a function of their mass and coupling strength; masses below 3.5 TeV are excluded at 95% confidence level for unit couplings to their standard model partners.", "doi": "10.1016/j.physletb.2014.09.048", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-11-10", "volume": "738", "pages": "274-293" }, { "id": "authors:w9vkw-8n964", "collection": "authors", "collection_id": "w9vkw-8n964", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150212-140230490", "type": "article", "title": "Search for standard model production of four top quarks in the lepton + jets channel in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for standard model (SM) production of four top quarks (tttt) in pp collisions in the lepton + jets channel. The data correspond to an integrated luminosity of 19.6 fb^(\u22121) recorded at a centre-of-mass energy of 8 TeV with the CMS detector at the CERN LHC. The expected cross section for SM tttt production is \u03c3^(SM)_(tttt)\u22481fb. A combination of kinematic reconstruction and multivariate techniques is used to distinguish between the small signal and large background. The data are consistent with expectations of the SM, and an upper limit of 32 fb is set at a 95% confidence level on the cross section for producing four top quarks in the SM, where a limit of 32 \u00b1 17 fb is expected.", "doi": "10.1007/JHEP11(2014)154", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-11", "series_number": "11", "volume": "2014", "issue": "11", "pages": "Art. No. 154" }, { "id": "authors:357f1-jtb97", "collection": "authors", "collection_id": "357f1-jtb97", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150206-115552911", "type": "article", "title": "Search for heavy neutrinos and W bosons with right-handed couplings in proton\u2013proton collisions at \u221as = 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for heavy, right-handed neutrinos, N_\u2113 ( \u2113=e,\u03bc), and right-handed W_R bosons, which arise in the left-right symmetric extensions of the standard model, has been performed by the CMS experiment. The search was based on a sample of two lepton plus two jet events collected in proton\u2013proton collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb^(\u22121) . For models with strict left-right symmetry, and assuming only one N_\u2113 flavor contributes significantly to the W_R decay width, the region in the two-dimensional (M_W_R,M_N_\u2113) mass plane excluded at a 95 % confidence level extends to approximately M_W_R=3.0TeV and covers a large range of neutrino masses below the W_R boson mass, depending on the value of M_W_R . This search significantly extends the (M_W_R,M_N_\u2113) exclusion region beyond previous results.", "doi": "10.1140/epjc/s10052-014-3149-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-11", "series_number": "11", "volume": "74", "issue": "11", "pages": "Art. No. 3149" }, { "id": "authors:sp984-ryj03", "collection": "authors", "collection_id": "sp984-ryj03", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150202-125709287", "type": "article", "title": "Measurement of pseudorapidity distributions of charged particles in proton\u2013proton collisions at \u221as = 8 TeV by the CMS and TOTEM experiments", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS and TOTEM Collaboration" } ], "abstract": "Pseudorapidity ( \u03b7 ) distributions of charged particles produced in proton\u2013proton collisions at a centre-of-mass energy of 8 TeV are measured in the ranges |\u03b7|<2.2 and 5.3<|\u03b7|<6.4 covered by the CMS and TOTEM detectors, respectively. The data correspond to an integrated luminosity of L=45 \u03bcb^(\u22121). Measurements are presented for three event categories. The most inclusive category is sensitive to 91\u201396 % of the total inelastic proton\u2013proton cross section. The other two categories are disjoint subsets of the inclusive sample that are either enhanced or depleted in single diffractive dissociation events. The data are compared to models used to describe high-energy hadronic interactions. None of the models considered provide a consistent description of the measured distributions.", "doi": "10.1140/epjc/s10052-014-3053-6", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-10-29", "series_number": "10", "volume": "74", "issue": "10", "pages": "Art. No. 3053" }, { "id": "authors:5s6x5-7y445", "collection": "authors", "collection_id": "5s6x5-7y445", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141216-083153984", "type": "article", "title": "Search for neutral MSSM Higgs bosons decaying to a pair of tau leptons in pp collisions", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for neutral Higgs bosons in the minimal supersymmetric extension of the standard model (MSSM) decaying to tau-lepton pairs in pp collisions is performed, using events recorded by the CMS experiment at the LHC. The dataset corresponds to an integrated luminosity of 24.6 fb^(\u22121), with 4.9 fb^(\u22121) at 7 TeV and 19.7 fb^(\u22121) at 8 TeV. To enhance the sensitivity to neutral MSSM Higgs bosons, the search includes the case where the Higgs boson is produced in association with a b-quark jet. No excess is observed in the tau-lepton-pair invariant mass spectrum. Exclusion limits are presented in the MSSM parameter space for different benchmark scenarios, m_h^(max), m_h^(mod)_\u2009+, m_h^(mod)_\u2009-, light-stop, light-stau, \u03c4-phobic, and low-m_H. Upper limits on the cross section times branching fraction for gluon fusion and b-quark associated Higgs boson production are also given.", "doi": "10.1007/JHEP10(2014)160", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-10-28", "series_number": "10", "volume": "2014", "issue": "10", "pages": "Art. No. 160" }, { "id": "authors:4evqg-jg048", "collection": "authors", "collection_id": "4evqg-jg048", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141204-160220718", "type": "article", "title": "Measurement of the ratio of inclusive jet cross sections using the anti-k_T algorithm with radius parameters R=0.5 and 0.7 in pp collisions at \u221as =7\u2009\u2009TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the inclusive jet cross section with the anti-k_ T clustering algorithm are presented for two radius parameters, R=0.5 and 0.7. They are based on data from LHC proton-proton collisions at \u221as =7\u2009\u2009TeV corresponding to an integrated luminosity of 5.0\u2009fb^(\u22121) collected with the CMS detector in 2011. The ratio of these two measurements is obtained as a function of the rapidity and transverse momentum of the jets. Significant discrepancies are found comparing the data to leading-order simulations and to fixed-order calculations at next-to-leading order, corrected for nonperturbative effects, whereas simulations with next-to-leading-order matrix elements matched to parton showers describe the data best.", "doi": "10.1103/PhysRevD.90.072006", "issn": "1550-7998", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-10-16", "series_number": "7", "volume": "90", "issue": "7", "pages": "Art. No. 072006" }, { "id": "authors:qk95c-nyx09", "collection": "authors", "collection_id": "qk95c-nyx09", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141210-105425884", "type": "article", "title": "Study of hadronic event-shape variables in multijet final states in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Event-shape variables, which are sensitive to perturbative and nonperturbative aspects of quantum chromodynamic (QCD) interactions, are studied in multijet events recorded in proton-proton collisions at \u221as=7 TeV. Events are selected with at least one jet with transverse momentum p_T > 110 GeV and pseudorapidity |\u03b7| < 2.4, in a data sample corresponding to integrated luminosities of up to 5 fb^(\u22121). The distributions of five event-shape variables in various leading jet p T ranges are compared to predictions from different QCD Monte Carlo event generators.", "doi": "10.1007/JHEP10(2014)087", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-10-14", "series_number": "10", "volume": "10", "issue": "10", "pages": "Art. No. 87" }, { "id": "authors:q1k57-gk721", "collection": "authors", "collection_id": "q1k57-gk721", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150109-100204993", "type": "article", "title": "Observation of the diphoton decay of the Higgs boson and measurement of its properties", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Observation of the diphoton decay mode of the recently discovered Higgs boson and measurement of some of its properties are reported. The analysis uses the entire dataset collected by the CMS experiment in proton-proton collisions during the 2011 and 2012 LHC running periods. The data samples correspond to integrated luminosities of 5.1 fb^(-1) at \u221as=7TeV and 19.7 fb^(-1) at 8 TeV . A clear signal is observed in the diphoton channel at a mass close to 125 GeV with a local significance of 5.7\u03c3 , where a significance of 5.2\u03c3 is expected for the standard model Higgs boson. The mass is measured to be 124.70\u00b10.34GeV=124.70\u00b10.31(stat)\u00b10.15(syst)GeV , and the best-fit signal strength relative to the standard model prediction is 1.14^(+0.26)_(\u22120.23)=1.14\u00b10.21(stat) ^(+0.09)_(\u22120.05)(syst) ^(+0.13)_(\u22120.09)(theo) . Additional measurements include the signal strength modifiers associated with different production mechanisms, and hypothesis tests between spin-0 and spin-2 models.", "doi": "10.1140/epjc/s10052-014-3076-z", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-10", "series_number": "10", "volume": "74", "issue": "10", "pages": "Art. No. 3076" }, { "id": "authors:am9qw-3th59", "collection": "authors", "collection_id": "am9qw-3th59", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150115-141757260", "type": "article", "title": "Description and performance of track and primary-vertex reconstruction with the CMS tracker", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A description is provided of the software algorithms developed for the CMS tracker both for reconstructing charged-particle trajectories in proton-proton interactions and for using the resulting tracks to estimate the positions of the LHC luminous region and individual primary-interaction vertices. Despite the very hostile environment at the LHC, the performance obtained with these algorithms is found to be excellent. For tt events under typical 2011 pileup conditions, the average track-reconstruction efficiency for promptly-produced charged particles with transverse momenta of p_T > 0.9GeV is 94% for pseudorapidities of |\u03b7| < 0.9 and 85% for 0.9 < |\u03b7| < 2.5. The inefficiency is caused mainly by hadrons that undergo nuclear interactions in the tracker material. For isolated muons, the corresponding efficiencies are essentially 100%. For isolated muons of p_T = 100GeV emitted at |\u03b7| < 1.4, the resolutions are approximately 2.8% in p_T, and respectively, 10\u03bcm and 30\u03bcm in the transverse and longitudinal impact parameters. The position resolution achieved for reconstructed primary vertices that correspond to interesting pp collisions is 10\u201312\u03bcm in each of the three spatial dimensions. The tracking and vertexing software is fast and flexible, and easily adaptable to other functions, such as fast tracking for the trigger, or dedicated tracking for electrons that takes into account bremsstrahlung.", "doi": "10.1088/1748-0221/9/10/P10009", "issn": "1748-0221", "publisher": "International School of Advanced Studies", "publication": "Journal of Instrumentation", "publication_date": "2014-10", "series_number": "10", "volume": "9", "issue": "10", "pages": "Art. No. 10009" }, { "id": "authors:8tnan-qzc84", "collection": "authors", "collection_id": "8tnan-qzc84", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150108-084407280", "type": "article", "title": "Evidence of b-Jet Quenching in PbPb Collisions at \u221aSNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of jets associated to bottom quarks is measured for the first time in PbPb collisions at a center-of-mass energy of 2.76 TeV per nucleon pair. Jet spectra are reported in the transverse momentum (p_T) range of 80\u2013250\u2009\u2009GeV/c, and within pseudorapidity |\u03b7|<2. The nuclear modification factor (R_(AA)) calculated from these spectra shows a strong suppression in the b-jet yield in PbPb collisions relative to the yield observed in pp collisions at the same energy. The suppression persists to the largest values of p_T studied, and is centrality dependent. The R_(AA) is about 0.4 in the most central events, similar to previous observations for inclusive jets. This implies that jet quenching does not have a strong dependence on parton mass and flavor in the jet p_T range studied.", "doi": "10.1103/PhysRevLett.113.132301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2014-09-26", "series_number": "13", "volume": "113", "issue": "13", "pages": "Art. No. 132301" }, { "id": "authors:16j2y-nwt08", "collection": "authors", "collection_id": "16j2y-nwt08", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150922-133222804", "type": "article", "title": "Searches for electroweak production of charginos, neutralinos, and sleptons decaying to leptons and W, Z, and Higgs bosons in pp collisions at 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Searches for the direct electroweak production of supersymmetric charginos, neutralinos, and sleptons in a variety of signatures with leptons and W, Z, and Higgs bosons are presented. Results are based on a sample of proton-proton collision data collected at center-of-mass energy s\u221a = 8 TeV with the CMS detector in 2012, corresponding to an integrated luminosity of 19.5 fb^(-1). The observed event rates are in agreement with expectations from the standard model. These results probe charginos and neutralinos with masses up to 720 GeV, and sleptons up to 260 GeV, depending on the model details.", "doi": "10.1140/epjc/s10052-014-3036-7", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-09-26", "series_number": "9", "volume": "74", "issue": "9", "pages": "Art. No. 3036" }, { "id": "authors:ce28f-8tf23", "collection": "authors", "collection_id": "ce28f-8tf23", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141027-141506611", "type": "article", "title": "Measurement of prompt J/\u03c8 pair production in pp collisions at \u221as = 7 Tev", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Production of prompt J/\u03c8 meson pairs in proton-proton collisions at \u221as = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb^(\u22121). The two J/\u03c8 mesons are fully reconstructed via their decays into \u03bc^+\u03bc^\u2212 pairs. This observation provides for the first time access to the high-transverse-momentum region of J/\u03c8 pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/\u03c8 transverse momentum (pT^(J/\u03c8)) and rapidity (|y^(J/\u03c8)|): |y^(J/\u03c8)| < 1.2 for p_T^(J/\u03c8) > 6.5 GeV/c; 1.2 < |y^(J/\u03c8)| < 1.43 for a pT threshold that scales linearly with |y^(J/\u03c8)| from 6.5 to 4.5 GeV/c; and 1.43 < |y^(J/\u03c8)| < 2.2 for p_T^(J/\u03c8) > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/\u03c8 pair production is 1.49 \u00b1 0.07 (stat) \u00b10.13 (syst) nb. Different assumptions about the J/\u03c8 polarization imply modifications to the cross section ranging from \u221231% to +27%.", "doi": "10.1007/JHEP09(2014)094", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-09-17", "series_number": "9", "volume": "2014", "issue": "9", "pages": "Art. No. 94" }, { "id": "authors:m8505-0bw96", "collection": "authors", "collection_id": "m8505-0bw96", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141016-091606621", "type": "article", "title": "Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Constraints are presented on the total width of the recently discovered Higgs boson, \u0393H, using its relative on-shell and off-shell production and decay rates to a pair of Z bosons, where one Z boson decays to an electron or muon pair, and the other to an electron, muon, or neutrino pair. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012, corresponding to integrated luminosities of 5.1 fb^\u221215.1 fb^\u22121 at a center-of-mass energy \u221as = 7 TeV and 19.7 fb^\u2212119.7 fb^\u22121 at \u221as = 8 TeV. A simultaneous maximum likelihood fit to the measured kinematic distributions near the resonance peak and above the Z-boson pair production threshold leads to an upper limit on the Higgs boson width of \u0393H<22 MeV at a 95% confidence level, which is 5.4 times the expected value in the standard model at the measured mass of mH=125.6 GeV.", "doi": "10.1016/j.physletb.2014.06.077", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-09-07", "volume": "736", "pages": "64-85" }, { "id": "authors:t87z3-m4e24", "collection": "authors", "collection_id": "t87z3-m4e24", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141017-073200215", "type": "article", "title": "Measurement of the ratio B(t \u2192Wb)/B(t \u2192Wq)in pp collisions at \u221as=8TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The ratio of the top-quark branching fractions R=B(t\u2192Wb)/B(t\u2192Wq)R=B(t\u2192Wb)/B(t\u2192Wq), where the denominator includes the sum over all down-type quarks (q=b,s,dq=b,s,d), is measured in the tt dilepton final state with proton\u2013proton collision data at \u221as=8TeV from an integrated luminosity of 19.7 fb^(\u22121), collected with the CMS detector. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. By counting the number of b jets per event, an unconstrained value of R=1.014\u00b10.003(stat.)\u00b10.032(syst.) is measured, in a good agreement with current precision measurements in electroweak and flavour sectors. A lower limit R>0.955R>0.955 at the 95% confidence level is obtained after requiring R\u22641R\u22641, and a lower limit on the Cabibbo\u2013Kobayashi\u2013Maskawa matrix element |V_(tb)|>0.975 is set at 95% confidence level. The result is combined with a previous CMS measurement of the t -channel single-top-quark cross section to determine the top-quark total decay width, \u0393_t=1.36 \u00b10.02 (stat.)^(+0.14)_(\u22120.11)(syst.)GeV.", "doi": "10.1016/j.physletb.2014.06.076", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-09-07", "volume": "736", "pages": "33-57" }, { "id": "authors:b4m5t-ry066", "collection": "authors", "collection_id": "b4m5t-ry066", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141021-130822196", "type": "article", "title": "Search for the associated production of the Higgs boson with a top-quark pair", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the standard model Higgs boson produced in association with a top-quark pair (ttH) is presented, using data samples corresponding to integrated luminosities of up to 5.1 fb^(\u22121) and 19.7 fb^(\u22121) collected in pp collisions at center-of-mass energies of 7 TeV and 8 TeV respectively. The search is based on the following signatures of the Higgs boson decay: H \u2192 hadrons, H \u2192 photons, and H \u2192 leptons. The results are characterized by an observed ttH signal strength relative to the standard model cross section, \u03bc=\u03c3/\u03c3 SM,under the assumption that the Higgs boson decays as expected in the standard model. The best fit value is \u03bc = 2.8 \u00b1 1.0 for a Higgs boson mass of 125.6 GeV.", "doi": "10.1007/JHEP09(2014)087", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-09", "series_number": "9", "volume": "2014", "issue": "9", "pages": "Art. No. 87" }, { "id": "authors:64w65-3n832", "collection": "authors", "collection_id": "64w65-3n832", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141017-090018333", "type": "article", "title": "Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at \u221as=8TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton\u2013proton collisions at \u221as=8TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5fb^(\u22121). The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate t_2 decaying to a lighter top-squark mass eigenstate t_1 via either t_2\u2192Ht_1 or t_2\u2192Zt_1, followed in both cases by t_1\u2192t\u03c7^0_1, where \u02dc\n\u03c7^0_1 is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the t_1 and \u03c7^0_1 states is approximately equal to the top-quark mass (m_(t1)\u2212m_\u03c7^0_1mt), which is not probed by searches for direct t_1 squark pair production. The analysis excludes top squarks with masses m_(t2)<575GeVand m_(t1)<400GeVat a 95% confidence level.", "doi": "10.1016/j.physletb.2014.07.053", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-09", "volume": "736", "pages": "371-397" }, { "id": "authors:e33af-15560", "collection": "authors", "collection_id": "e33af-15560", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141020-121537754", "type": "article", "title": "Search for WW\u03b3 and WZ\u03b3 production and constraints on anomalous quartic gauge couplings in pp collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for WV\u03b3 triple vector boson production is presented based on events containing a W boson decaying to a muon or an electron and a neutrino, a second V (W or Z) boson, and a photon. The data correspond to an integrated luminosity of 19.3\u2009\u2009fb^(\u22121) collected in 2012 with the CMS detector at the LHC in pp collisions at \u221as = 8\u2009\u2009TeV. An upper limit of 311 fb on the cross section for the WV\u03b3 production process is obtained at 95% confidence level for photons with a transverse energy above 30 GeV and with an absolute value of pseudorapidity of less than 1.44. This limit is approximately a factor of 3.4 larger than the standard model predictions that are based on next-to-leading order QCD calculations. Since no evidence of anomalous WW\u03b3\u03b3 or WWZ\u03b3 quartic gauge boson couplings is found, this paper presents the first experimental limits on the dimension-eight parameter f_T,_0 and the CP conserving WWZ\u03b3 parameters \u03ba ^W _0 and \u03ba^W_C. Limits are also obtained for the WW\u03b3\u03b3 parameters a^W_0 and a^W_C.", "doi": "10.1103/PhysRevD.90.032008", "issn": "1550-7998", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-08-25", "series_number": "3", "volume": "90", "issue": "3", "pages": "Art. No. 032008" }, { "id": "authors:nt5zd-h5007", "collection": "authors", "collection_id": "nt5zd-h5007", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141008-115416489", "type": "article", "title": "Measurement of jet multiplicity distributions in tt[bar] production in pp collisions at s\u221a=7TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC with the CMS detector. The measurement is performed in both the dilepton and lepton+jets decay channels using data corresponding to an integrated luminosity of 5.0 fb^(-1). Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the tt[bar] production is determined as a function of the additional jet multiplicity in the lepton+jets channel. Furthermore, the fraction of events with no additional jets is measured in the dilepton channel, as a function of the threshold on the jet transverse momentum. The measurements are compared with predictions from perturbative quantum chromodynamics and no significant deviations are observed.", "doi": "10.1140/epjc/s10052-014-3014-0", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-08-20", "series_number": "8", "volume": "74", "issue": "8", "pages": "Art. No. 3014" }, { "id": "authors:cfk7f-ata26", "collection": "authors", "collection_id": "cfk7f-ata26", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150629-091355929", "type": "article", "title": "Search for anomalous production of events with three or more leptons in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for physics beyond the standard model in events with at least three leptons is presented. The data sample, corresponding to an integrated luminosity of 19.5\u2009\u2009fb^(\u22121) of proton-proton collisions with center-of-mass energy \u221as=8\u2009\u2009TeV, was collected by the CMS experiment at the LHC during 2012. The data are divided into exclusive categories based on the number of leptons and their flavor, the presence or absence of an opposite-sign, same-flavor lepton pair (OSSF), the invariant mass of the OSSF pair, the presence or absence of a tagged bottom-quark jet, the number of identified hadronically decaying \u03c4 leptons, and the magnitude of the missing transverse energy and of the scalar sum of jet transverse momenta. The numbers of observed events are found to be consistent with the expected numbers from standard model processes, and limits are placed on new-physics scenarios that yield multilepton final states. In particular, scenarios that predict Higgs boson production in the context of supersymmetric decay chains are examined. We also place a 95% confidence level upper limit of 1.3% on the branching fraction for the decay of a top quark to a charm quark and a Higgs boson (t\u2192cH), which translates to a bound on the left- and right-handed top-charm flavor-violating Higgs Yukawa couplings, \u03bb^H_(tc) and \u03bb^H_(ct), respectively, of \u221a|\u03bb^H_(tc)|^2+|\u03bb^H_(ct)|^2<0.21.", "doi": "10.1103/PhysRevD.90.032006", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-08-20", "series_number": "3", "volume": "90", "issue": "3", "pages": "Art. No. 032006" }, { "id": "authors:tnvbm-cv138", "collection": "authors", "collection_id": "tnvbm-cv138", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140929-074122463", "type": "article", "title": "Measurement of jet fragmentation in PbPb and pp collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The jet fragmentation function of inclusive jets with transverse momentum p_T above 100GeV/c in PbPb collisions has been measured using reconstructed charged particles with p_T above 1GeV/c in a cone of radius 0.3 around the jet axis. A data sample of PbPb collisions collected in 2011 at a nucleon-nucleon center-of-mass energy of \u221asNN = 2.76 TeV corresponding to an integrated luminosity of 150\u03bcb^(\u22121) is used. The results for PbPb collisions as a function of collision centrality and jet transverse momentum are compared to reference distributions based on pp data collected at the same center-of-mass energy in 2013, with an integrated luminosity of 5.3pb^(\u22121). A centrality-dependent modification of the fragmentation function is found. For the most central collisions, a significant enhancement is observed in the PbPb/pp fragmentation function ratio for charged particles with p_T less than 3GeV/c. This enhancement is observed for all jet p_T bins studied.", "doi": "10.1103/PhysRevC.90.024908", "issn": "0556-2813", "publisher": "American Physical Society", "publication": "Physical Review C", "publication_date": "2014-08-18", "series_number": "2", "volume": "90", "issue": "2", "pages": "Art. No. 024908" }, { "id": "authors:hnr83-avx69", "collection": "authors", "collection_id": "hnr83-avx69", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141015-125323846", "type": "article", "title": "Measurement of the muon charge asymmetry in inclusive pp \u2192 W + X production at \u221as = 7\u2009\u2009TeV and an improved determination of light parton distribution functions", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the muon charge asymmetry in inclusive pp\u2192W+X production at \u221as =7\u2009TeV are presented. The data sample corresponds to an integrated luminosity of 4.7\u2009fb^(\u22121) recorded with the CMS detector at the LHC. With a sample of more than 20 million W\u2192\u03bc\u03bd events, the statistical precision is greatly improved in comparison to previous measurements. These new results provide additional constraints on the parton distribution functions of the proton in the range of the Bjorken scaling variable x from 10^(\u22123) to 10^(\u22121). These measurements and the recent CMS measurement of associated W+ charm production are used together with the cross sections for inclusive deep inelastic e \u00b1 p scattering at HERA in a next-to-leading-order QCD analysis. The determination of the valence quark distributions is improved, and the strange-quark distribution is probed directly through the leading-order process g+s\u2192W+c in proton-proton collisions at the LHC.", "doi": "10.1103/PhysRevD.90.032004", "issn": "1550-7998", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-08-13", "series_number": "3", "volume": "90", "issue": "3", "pages": "Art. No. 032004" }, { "id": "authors:eezsp-pjb11", "collection": "authors", "collection_id": "eezsp-pjb11", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140912-105011525", "type": "article", "title": "Measurement of WZ and ZZ production in pp collisions at \u221as = 8 TeV in final states with b-tagged jets", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements are reported of the WZ and ZZ production cross sections in proton-proton collisions at \u221as=8 TeV in final states where one Z boson decays to b-tagged jets. The other gauge boson, either W or Z, is detected through its leptonic decay (either W\u2192e\u03bd, \u03bc\u03bd or Z\u2192e^+e^\u2212, \u03bc^+\u03bc\u2212, or \u03bd\u03bd). The results are based on data corresponding to an integrated luminosity of 18.9 fb^(\u22121) collected with the CMS detector at the Large Hadron Collider. The measured cross sections, (pp\u2192WZ)=30.7\u00b19.3(stat.)\u00b17.1(syst.)\u00b14.1(th.)\u00b11.0(lum.)pb and \u03c3(pp\u2192ZZ)=6.5\u00b11.7(stat.)\u00b11.0(syst.)\u00b10.9(th.)\u00b10.2(lum.)pb , are consistent with next-to-leading order quantum chromodynamics calculations.", "doi": "10.1140/epjc/s10052-014-2973-5", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-08-07", "series_number": "8", "volume": "74", "issue": "8", "pages": "Art. No. 2973" }, { "id": "authors:rpy8n-sv127", "collection": "authors", "collection_id": "rpy8n-sv127", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141016-161149087", "type": "article", "title": "Search for jet extinction in the inclusive jet-p_T spectrum from proton-proton collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The first search at the LHC for the extinction of QCD jet production is presented, using data collected with the CMS detector corresponding to an integrated luminosity of 10.7\u2009\u2009fb^(\u22121) of proton-proton collisions at a center-of-mass energy of 8 TeV. The extinction model studied in this analysis is motivated by the search for signatures of strong gravity at the TeV scale (terascale gravity) and assumes the existence of string couplings in the strong-coupling limit. In this limit, the string model predicts the suppression of all high-transverse-momentum standard model processes, including jet production, beyond a certain energy scale. To test this prediction, the measured transverse-momentum spectrum is compared to the theoretical prediction of the standard model. No significant deficit of events is found at high transverse momentum. A 95% confidence level lower limit of 3.3 TeV is set on the extinction mass scale.", "doi": "10.1103/PhysRevD.90.032005", "issn": "1550-7998", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-08-01", "series_number": "3", "volume": "90", "issue": "3", "pages": "Art. No. 032005" }, { "id": "authors:40nm1-1mq33", "collection": "authors", "collection_id": "40nm1-1mq33", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141013-101227573", "type": "article", "title": "Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is reported for massive resonances decaying into a quark and a vector boson (W or Z), or two vector bosons (WW, WZ, or ZZ). The analysis is performed on an inclusive sample of multijet events corresponding to an integrated luminosity of 19.7 fb^(\u22121), collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. The search uses novel jet-substructure identification techniques that provide sensitivity to the presence of highly boosted vector bosons decaying into a pair of quarks. Exclusion limits are set at a confidence level of 95% on the production of: (i) excited quark resonances q^* decaying to qW and qZ for masses less than 3.2 TeV and 2.9 TeV, respectively, (ii) a Randall-Sundrum graviton GRS decaying into WW for masses below 1.2 TeV, and (iii) a heavy partner of the W boson W\u2032 decaying into WZ for masses less than 1.7 TeV. For the first time mass limits are set on W\u2032 \u2192 WZ and G_(RS) \u2192 WW in the all-jets final state. The mass limits on q^* \u2192 qW, q^* \u2192 qZ, W\u2032 \u2192 WZ, G_(RS) \u2192 WW are the most stringent to date. A model with a \"bulk\" graviton Gbulk that decays into WW or ZZ bosons is also studied.", "doi": "10.1007/JHEP08(2014)173", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-08", "series_number": "8", "volume": "2014", "issue": "8", "pages": "Art. No. 173" }, { "id": "authors:q14gf-pt870", "collection": "authors", "collection_id": "q14gf-pt870", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141013-104524734", "type": "article", "title": "Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new resonances decaying to WW, ZZ, or WZ is presented. Final states are considered in which one of the vector bosons decays leptonically and the other hadronically. Results are based on data corresponding to an integrated luminosity of 19.7 fb^(\u22121) recorded in proton-proton collisions at \u221as = 8 TeV with the CMS detector at the CERN LHC. Techniques aiming at identifying jet substructures are used to analyze signal events in which the hadronization products from the decay of highly boosted W or Z bosons are contained within a single reconstructed jet. Upper limits on the production of generic WW, ZZ, or WZ resonances are set as a function of the resonance mass and width. We increase the sensitivity of the analysis by statistically combining the results of this search with a complementary study of the all-hadronic final state. Upper limits at 95% confidence level are set on the bulk graviton production cross section in the range from 700 to 10 fb for resonance masses between 600 and 2500 GeV, respectively. These limits on the bulk graviton model are the most stringent to date in the diboson final state.", "doi": "10.1007/JHEP08(2014)174", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-08", "series_number": "8", "volume": "2014", "issue": "8", "pages": "Art. No. 174" }, { "id": "authors:60wf5-kch63", "collection": "authors", "collection_id": "60wf5-kch63", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140904-103334936", "type": "article", "title": "Measurement of the production cross section for a W boson and two b jets in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The production cross section for a W boson and two b jets is measured using proton\u2013proton collisions at \u221as = 7 TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity of 5.0 fb^(\u22121). The W + bb events are selected in the W \u2192 \u03bc\u03bd decay mode by requiring a muon with transverse momentum p_T>25 GeV and pseudorapidity |\u03b7|<2.1, and exactly two b-tagged jets with p_T>25 GeV and |\u03b7|<2.4. The measured W + bb production cross section in the fiducial region, calculated at the level of final-state particles, is \u03c3(pp \u2192 W+bb) B(W \u2192 \u03bc\u03bd) = 0.53 \u00b1 0.05 (stat.) \u00b1 0.09 (syst.) \u00b1 0.06 (theo.) \u00b1 0.01 (lum.) pb, in agreement with the standard model prediction. In addition, kinematic distributions of the W + bb system are in agreement with the predictions of a simulation using MADGRAPH and PYTHIA.", "doi": "10.1016/j.physletb.2014.06.041", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-07-30", "volume": "735", "pages": "204-225" }, { "id": "authors:jp2y6-1pn47", "collection": "authors", "collection_id": "jp2y6-1pn47", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140902-101720140", "type": "article", "title": "Studies of dijet transverse momentum balance and pseudorapidity distributions in pPb collisions at \u221asNN = 5.02 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Dijet production has been measured in pPb collisions at a nucleon\u2013nucleon centre-of-mass energy of 5.02 TeV . A data sample corresponding to an integrated luminosity of 35 nb^(\u22121) was collected using the Compact Muon Solenoid detector at the Large Hadron Collider. The dijet transverse momentum balance, azimuthal angle correlations, and pseudorapidity distributions are studied as a function of the transverse energy in the forward calorimeters ( E^(4<|\u03b7|<5.2)_T ). For pPb collisions, the dijet transverse momentum ratio and the width of the distribution of dijet azimuthal angle difference are comparable to the same quantities obtained from a simulated pp reference and insensitive to E^(4<|\u03b7|<5.2)_T . In contrast, the mean value of the dijet pseudorapidity is found to change monotonically with increasing E^(4<|\u03b7|<5.2)_T , indicating a correlation between the energy emitted at large pseudorapidity and the longitudinal motion of the dijet frame. The pseudorapidity distribution of the dijet system in minimum bias pPb collisions is compared with next-to-leading-order perturbative QCD predictions obtained from both nucleon and nuclear parton distribution functions, and the data more closely match the latter.", "doi": "10.1140/epjc/s10052-014-2951-y", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-07-23", "series_number": "7", "volume": "74", "issue": "7", "pages": "Art. No. 2951" }, { "id": "authors:cnzr3-x6138", "collection": "authors", "collection_id": "cnzr3-x6138", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140811-131704662", "type": "article", "title": "The Caltech CSN project collects sensor data from thousands of personal devices for realtime response to dangerous earthquakes", "author": [ { "family_name": "Faulkner", "given_name": "Matthew Nicholas", "clpid": "Faulkner-Matthew-Nicholas" }, { "family_name": "Clayton", "given_name": "Robert W.", "orcid": "0000-0003-3323-3508", "clpid": "Clayton-R-W" }, { "family_name": "Heaton", "given_name": "Thomas H.", "orcid": "0000-0003-3363-2197", "clpid": "Heaton-T-H" }, { "family_name": "Chandy", "given_name": "K. Mani", "orcid": "0000-0001-9190-1290", "clpid": "Chandy-K-M" }, { "family_name": "Kohler", "given_name": "Monica D.", "orcid": "0000-0002-4703-190X", "clpid": "Kohler-M-D" }, { "family_name": "Bunn", "given_name": "Julian J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Guy", "given_name": "Richard", "orcid": "0000-0002-8651-5608", "clpid": "Guy-R" }, { "family_name": "Liu", "given_name": "Annie", "clpid": "Liu-Annie-H" }, { "family_name": "Olson", "given_name": "Michael", "clpid": "Olson-M" }, { "family_name": "Cheng", "given_name": "MingHei", "clpid": "Cheng-Ming-Hei" }, { "family_name": "Krause", "given_name": "Andreas", "orcid": "0000-0001-7260-9673", "clpid": "Krause-A" } ], "abstract": "The proliferation of smartphones and other powerful sensor-equipped consumer devices enables a new class of Web application: community sense and response (CSR) systems, distinguished from standard Web applications by their use of community-owned commercial sensor hardware. Just as social networks connect and share human-generated content, CSR systems gather, share, and act on sensory data from users' Internet-enabled devices. Here, we discuss the Caltech Community Seismic Network (CSN) as a prototypical CSR system harnessing accelerometers in smartphones and consumer electronics, including the systems and algorithmic challenges of designing, building, and evaluating a scalable network for real-time awareness of dangerous earthquakes.", "doi": "10.1145/2622633", "issn": "0001-0782", "publisher": "Association for Computing Machinery", "publication": "Communications of the ACM", "publication_date": "2014-07", "series_number": "7", "volume": "57", "issue": "7", "pages": "66-75" }, { "id": "authors:06xvj-bp732", "collection": "authors", "collection_id": "06xvj-bp732", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140819-131736568", "type": "article", "title": "Community Sense and Response Systems: Your Phone as Quake Detector", "author": [ { "family_name": "Faulkner", "given_name": "Matthew", "clpid": "Faulkner-Matthew-Nicholas" }, { "family_name": "Clayton", "given_name": "Robert W.", "orcid": "0000-0003-3323-3508", "clpid": "Clayton-R-W" }, { "family_name": "Heaton", "given_name": "Thomas H.", "orcid": "0000-0003-3363-2197", "clpid": "Heaton-T-H" }, { "family_name": "Chandy", "given_name": "K. Mani", "orcid": "0000-0001-9190-1290", "clpid": "Chandy-K-M" }, { "family_name": "Kohler", "given_name": "Monica D.", "orcid": "0000-0002-4703-190X", "clpid": "Kohler-M-D" }, { "family_name": "Bunn", "given_name": "Julian J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Guy", "given_name": "Richard", "orcid": "0000-0002-8651-5608", "clpid": "Guy-R" }, { "family_name": "Liu", "given_name": "Annie", "clpid": "Liu-Annie-H" }, { "family_name": "Olson", "given_name": "Michael", "clpid": "Olson-M" }, { "family_name": "Cheng", "given_name": "Ming-Hei", "clpid": "Cheng-Ming-Hei" }, { "family_name": "Krause", "given_name": "Andreas", "orcid": "0000-0001-7260-9673", "clpid": "Krause-A" } ], "abstract": "The proliferation of smartphones and other powerful sensor-equipped consumer devices enables a new class of Web application: community sense and response (CSR) systems, distinguished from standard Web applications by their use of community-owned commercial sensor hardware. Just as social networks connect and share human-generated content, CSR systems gather, share, and act on sensory data from users' Internet-enabled devices. Here, we discuss the Caltech Community Seismic Network (CSN) as a prototypical CSR system harnessing accelerometers in smartphones and consumer electronics, including the systems and algorithmic challenges of designing, building, and evaluating a scalable network for real-time awareness of dangerous earthquakes.", "doi": "10.1145/2622633", "issn": "0001-0782", "publisher": "Association for Computing Machinery", "publication": "Communications of the ACM", "publication_date": "2014-07", "series_number": "7", "volume": "57", "issue": "7", "pages": "66-75" }, { "id": "authors:e57e5-hbt20", "collection": "authors", "collection_id": "e57e5-hbt20", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140821-091946316", "type": "article", "title": "Observation of a peaking structure in the J/\u03c8\u03c6 mass spectrum from B^\u00b1 \u2192 J/\u03c8\u03c6K^\u00b1 decays", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A peaking structure in the J/\u03c8 \u03d5 mass spectrum near threshold is observed in B^\u00b1 \u2192 J/\u03c8 \u03d5 K^\u00b1 decays, produced in pp collisions at \u221as =7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/\u03c8, corresponds to an integrated luminosity of 5.2 fb^(\u22121). Fitting the structure to an S -wave relativistic Breit\u2013Wigner lineshape above a three-body phase-space nonresonant component gives a signal statistical significance exceeding five standard deviations. The fitted mass and width values are m = 4148.0\u00b12.4(stat.)\u00b16.3(syst.)MeV and \u0393 = 28_(\u221211)^(+15)(stat.)\u00b119(syst.)MeV, respectively. Evidence for an additional peaking structure at higher J/\u03c8 \u03d5 mass is also reported.", "doi": "10.1016/j.physletb.2014.05.055", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-06-27", "volume": "734", "pages": "261-281" }, { "id": "authors:b43ae-t9142", "collection": "authors", "collection_id": "b43ae-t9142", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140811-131725768", "type": "article", "title": "Search for pair production of excited top quarks in the lepton + jets final state", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for pair-produced spin-3/2 excited top quarks t*t^-)*, each decaying to a top quark and a gluon. The search uses data collected with the CMS detector from pp collisions at a center-of-mass energy of \u221as = 8 TeV, selecting events that have a single isolated muon or electron, an imbalance in transverse momentum, and at least six jets, of which one must be compatible with originating from the fragmentation of a b quark. The data, corresponding to an integrated luminosity of 19.5 fb^(\u22121), show no significant excess over standard model predictions, and provide a lower limit of 803 GeV at 95% confidence on the mass of the spin-3/2 t* quark in an extension of the Randall-Sundrum model, assuming a 100% branching fraction of its decay into a top quark and a gluon. This is the first search for a spin-3/2 excited top quark performed at the LHC.", "doi": "10.1007/JHEP06(2014)125", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-06-19", "series_number": "6", "volume": "2014", "issue": "6", "pages": "Art. No. 125" }, { "id": "authors:24v2q-dfp46", "collection": "authors", "collection_id": "24v2q-dfp46", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140812-075839644", "type": "article", "title": "Measurement of the t-channel single-top-quark production cross section and of the |V_(tb)| CKM matrix element in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements are presented of the t-channel single-top-quark production cross section in proton-proton collisions at \u221as = 8 TeV. The results are based on a data sample corresponding to an integrated luminosity of 19.7 fb^(\u22121) recorded with the CMS detector at the LHC. The cross section is measured inclusively, as well as separately for top (t) and antitop (t), in final states with a muon or an electron. The measured inclusive t-channel cross section is \u03c3_(t-ch).= 83.6 \u00b1 2.3 (stat.) \u00b1 7.4 (syst.) pb. The single t and t cross sections are measured to be \u03c3_(t-ch).(t) = 53.8 \u00b1 1.5 (stat.) \u00b1 4.4 (syst.) pb and \u03c3_)t-ch).(t) = 27.6 \u00b1 1.3 (stat.) \u00b1 3.7 (syst.) pb, respectively. The measured ratio of cross sections is R_(t-ch). = \u03c3_(t-ch).(t)/\u03c3_(t-ch). (t) = 1.95 \u00b1 0.10 (stat.) \u00b1 0.19 (syst.), in agreement with the standard model prediction. The modulus of the Cabibbo-Kobayashi-Maskawa matrix element V_(tb) is extracted and, in combination with a previous CMS result at \u221as = 7 TeV, a value |V_(tb)| = 0.998 \u00b1 0.038 (exp.) \u00b1 0.016 (theo.) is obtained.", "doi": "10.1007/JHEP06(2014)090", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-06-16", "series_number": "6", "volume": "2014", "issue": "6", "pages": "Art. No. 90" }, { "id": "authors:1tqy3-hrm56", "collection": "authors", "collection_id": "1tqy3-hrm56", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140714-142043226", "type": "article", "title": "Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at \u221as = 8\u2009\u2009TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The first observation of the associated production of a single top quark and a W boson is presented. The analysis is based on a data set corresponding to an integrated luminosity of 12.2\u2009\u2009fb^(\u22121) of proton-proton collisions at \u221as=8\u2009\u2009TeV recorded by the CMS experiment at the LHC. Events with two leptons and a jet originating from a b quark are selected. A multivariate analysis based on kinematic and topological properties is used to separate the signal from the dominant tt background. An excess consistent with the signal hypothesis is observed, with a significance which corresponds to 6.1 standard deviations above a background-only hypothesis. The measured production cross section is 23.4\u00b15.4\u2009\u2009pb , in agreement with the standard model prediction.", "doi": "10.1103/PhysRevLett.112.231802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2014-06-13", "series_number": "23", "volume": "112", "issue": "23", "pages": "Art. No. UNSP 231802" }, { "id": "authors:qm7x0-1b477", "collection": "authors", "collection_id": "qm7x0-1b477", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140801-074903951", "type": "article", "title": "Probing color coherence effects in pp collisions at \u221as = 7TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A study of color coherence effects in pp collisions at a center-of-mass energy of 7 TeV is presented. The data used in the analysis were collected in 2010 with the CMS detector at the LHC and correspond to an integrated luminosity of 36 pb^(\u22121). Events are selected that contain at least three jets and where the two jets with the largest transverse momentum exhibit a back-to-back topology. The measured angular correlation between the second- and third-leading jet is shown to be sensitive to color coherence effects, and is compared to the predictions of Monte Carlo models with various implementations of color coherence. None of the models describe the data satisfactorily.", "doi": "10.1140/epjc/s10052-014-2901-8", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-06-11", "series_number": "6", "volume": "74", "issue": "6", "pages": "Art. No. 2901" }, { "id": "authors:5f5f9-89f20", "collection": "authors", "collection_id": "5f5f9-89f20", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140811-151556774", "type": "article", "title": "Measurement of the triple-differential cross section for photon + jets production in proton-proton collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the triple-differential cross section, d^3 \u03c3/(dp^\u03d2_T d\u03b7^ \u03d2 d\u03b7^jet) , in photon + jets final states using a data sample from proton-proton collisions at \u221as = 7 TeV is presented. This sample corresponds to an integrated luminosity of 2.14 fb^(\u22121) collected by the CMS detector at the LHC. Photons and jets are reconstructed within a pseudorapidity range of |\u03b7| < 2.5, and are required to have transverse momenta in the range 40 < p^(jet)_T< 300 GeV and p^(jet)_T > 30 GeV, respectively. The measurements are compared to theoretical predictions from the sherpa leading-order QCD Monte Carlo event generator and the next-to-leading-order perturbative QCD calculation from jetphox. The predictions are found to be consistent with the data over most of the examined kinematic region.", "doi": "10.1007/JHEP06(2014)009", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-06-03", "series_number": "6", "volume": "2014", "issue": "6", "pages": "Art. No. 009" }, { "id": "authors:md3x1-ady40", "collection": "authors", "collection_id": "md3x1-ady40", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140801-102510003", "type": "article", "title": "Study of the production of charged pions, kaons, and protons in pPb collisions at \u221a(^sNN) = 5.02 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Spectra of identified charged hadrons are measured in pPb collisions with the CMS detector at the LHC at \u221a(^ sNN) = 5.02TeV . Charged pions, kaons, and protons in the transverse-momentum range pT\u22480.1 \u20131.7 GeV/c and laboratory rapidity |y|<1 are identified via their energy loss in the silicon tracker. The average pT increases with particle mass and the charged multiplicity of the event. The increase of the average pT with charged multiplicity is greater for heavier hadrons. Comparisons to Monte Carlo event generators reveal that Epos Lhc, which incorporates additional hydrodynamic evolution of the created system, is able to reproduce most of the data features, unlike Hijing and Ampt. The pT spectra and integrated yields are also compared to those measured in pp and PbPb collisions at various energies. The average transverse momentum and particle ratio measurements indicate that particle production at LHC energies is strongly correlated with event particle multiplicity.", "doi": "10.1140/epjc/s10052-014-2847-x", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014-06-03", "series_number": "6", "volume": "74", "issue": "6", "pages": "Art. No. 2847" }, { "id": "authors:6ehs6-0t755", "collection": "authors", "collection_id": "6ehs6-0t755", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140626-100649166", "type": "article", "title": "Search for supersymmetry in pp collisions at \u221as = 8 TeV in events with a single lepton, large jet multiplicity, and multiple b jets", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported from a search for supersymmetry in pppp collisions at a center-of-mass energy of 8 TeV, based on events with a single isolated lepton (electron or muon) and multiple jets, at least two of which are identified as b jets. The data sample corresponds to an integrated luminosity of 19.3 fb^(\u22121)recorded by the CMS experiment at the LHC in 2012. The search is motivated by supersymmetric models that involve strong-production processes and cascade decays of new particles. The resulting final states contain multiple jets as well as missing transverse momentum from weakly interacting particles. The event yields, observed across several kinematic regions, are consistent with the expectations from standard model processes. The results are interpreted in the context of simplified supersymmetric scenarios with pair production of gluinos, where each gluino decays to a top quark\u2013antiquark pair and the lightest neutralino. For the case of decays via virtual top squarks, gluinos with a mass smaller than 1.26 TeV are excluded for low neutralino masses.", "doi": "10.1016/j.physletb.2014.04.023", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-06-02", "volume": "733", "pages": "328-353" }, { "id": "authors:he73m-vj059", "collection": "authors", "collection_id": "he73m-vj059", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140818-133658645", "type": "article", "title": "Search for new physics in the multijet and missing transverse momentum final state in proton-proton collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics is performed in multijet events with large missing transverse momentum produced in proton-proton collisions at \u221as = 8 TeV using a data sample corresponding to an integrated luminosity of 19.5 fb^(\u22121) collected with the CMS detector at the LHC. The data sample is divided into three jet multiplicity categories (3-5, 6-7, and \u22658 jets), and studied further in bins of two variables: the scalar sum of jet transverse momenta and the missing transverse momentum. The observed numbers of events in various categories are consistent with backgrounds expected from standard model processes. Exclusion limits are presented for several simplified supersymmetric models of squark or gluino pair production.", "doi": "10.1007/JHEP06(2014)055", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-06", "series_number": "6", "volume": "2014", "issue": "6", "pages": "Art. No. 55" }, { "id": "authors:wjn6r-7ky28", "collection": "authors", "collection_id": "wjn6r-7ky28", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140731-144049143", "type": "article", "title": "Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of a Z boson, decaying into two leptons and produced in association with one or more b jets, is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV. The data were recorded in 2011 with the CMS detector and correspond to an integrated luminosity of 5 fb^(\u22121). The Z(\u2113\u2113) + b-jets cross sections (where \u2113\u2113 = \u03bc\u03bc or ee) are measured separately for a Z boson produced with exactly one b jet and with at least two b jets. In addition, a cross section ratio is extracted for a Z boson produced with at least one b jet, relative to a Z boson produced with at least one jet. The measured cross sections are compared to various theoretical predictions, and the data favour the predictions in the five-flavour scheme, where b quarks are assumed massless. The kinematic properties of the reconstructed particles are compared with the predictions from the MadGraph event generator using the pythia parton shower simulation.", "doi": "10.1007/JHEP06(2014)120", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-06", "series_number": "6", "volume": "2014", "issue": "6", "pages": "Art. No. 120" }, { "id": "authors:wb9at-zjw03", "collection": "authors", "collection_id": "wb9at-zjw03", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140911-105649603", "type": "article", "title": "Alignment of the CMS tracker with LHC and cosmic ray data", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The central component of the CMS detector is the largest silicon tracker ever built. The precise alignment of this complex device is a formidable challenge, and only achievable with a significant extension of the technologies routinely used for tracking detectors in the past. This article describes the full-scale alignment procedure as it is used during LHC operations. Among the specific features of the method are the simultaneous determination of up to 200 000 alignment parameters with tracks, the measurement of individual sensor curvature parameters, the control of systematic misalignment effects, and the implementation of the whole procedure in a multi-processor environment for high execution speed. Overall, the achieved statistical accuracy on the module alignment is found to be significantly better than 10\u03bcm.", "doi": "10.1088/1748-0221/9/06/P06009", "issn": "1748-0221", "publisher": "International School of Advanced Studies", "publication": "Journal of Instrumentation", "publication_date": "2014-06", "series_number": "6", "volume": "9", "issue": "6", "pages": "Art. No. P06009" }, { "id": "authors:1cmeh-1ny80", "collection": "authors", "collection_id": "1cmeh-1ny80", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140623-093156667", "type": "article", "title": "Measurement of Inclusive W and Z Boson Production Cross Sections in pp Collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of total and fiducial inclusive W and Z boson production cross sections in pp collisions at \u221as = 8\u2009\u2009TeV is presented. Electron and muon final states are analyzed in a data sample collected with the CMS detector corresponding to an integrated luminosity of 18.2\u00b10.5\u2009\u2009pb^(\u22121). The measured total inclusive cross sections times branching fractions are \u03c3(pp\u2192WX)\u00d7B(W\u2192\u2113\u03bd)=12.21\u00b10.03(stat)\u00b10.24(syst)\u00b10.32(lum)\u2009\u2009nb and \u03c3(pp\u2192ZX)\u00d7B(Z\u2192\u2113^+\u2113^\u2212)=1.15\u00b10.01(stat)\u00b10.02(syst)\u00b10.03(lum)\u2009\u2009nb for the dilepton mass in the range of 60\u2014120 GeV. The measured values agree with next-to-next-to-leading-order QCD cross section calculations. Ratios of cross sections are reported with a precision of 2%. This is the first measurement of inclusive W and Z boson production in proton-proton collisions at \u221as = 8\u2009\u2009TeV.", "doi": "10.1103/PhysRevLett.112.191802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2014-05-14", "series_number": "19", "volume": "112", "issue": "19", "pages": "Art. No. 191802" }, { "id": "authors:q1j5m-v6883", "collection": "authors", "collection_id": "q1j5m-v6883", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140623-072241201", "type": "article", "title": "Measurements of tt Spin Correlations and Top-Quark Polarization Using Dilepton Final States in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Spin correlations and polarization in the top quark\u2013antiquark system are measured using dilepton final states produced in pp collisions at the LHC at \u221as=7\u2009\u2009TeV. The data correspond to an integrated luminosity of 5.0\u2009\u2009fb^(\u22121) collected with the CMS detector. The measurements are performed using events with two oppositely charged leptons (electrons or muons), a significant imbalance in transverse momentum, and two or more jets, where at least one of the jets is identified as originating from a b quark. The spin correlations and polarization are measured through asymmetries in angular distributions of the two selected leptons, unfolded to the parton level. All measurements are found to be in agreement with predictions of the standard model.", "doi": "10.1103/PhysRevLett.112.182001", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2014-05-05", "series_number": "18", "volume": "112", "issue": "18", "pages": "Art. No. 182001" }, { "id": "authors:q57ax-g4k18", "collection": "authors", "collection_id": "q57ax-g4k18", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140630-152148823", "type": "article", "title": "Search for Flavor-Changing Neutral Currents in Top-Quark Decays t \u2192 Zq in pp Collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for flavor-changing neutral currents in top-quark decays t\u2192Zq is performed in events produced from the decay chain tt\u2192Zq+Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A data set collected with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121) of proton-proton collisions at a center-of-mass energy of 8 TeV. No excess is seen in the observed number of events relative to the standard model prediction; thus, no evidence for flavor-changing neutral currents in top-quark decays is found. A combination with a previous search at 7 TeV excludes a t\u2192Zq branching fraction greater than 0.05% at the 95% confidence level.", "doi": "10.1103/PhysRevLett.112.171802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2014-05-02", "series_number": "17", "volume": "112", "issue": "17", "pages": "Art. No. 171802" }, { "id": "authors:5s3qh-r2b17", "collection": "authors", "collection_id": "5s3qh-r2b17", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140714-110213068", "type": "article", "title": "Measurement of four-jet production in proton-proton collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the differential cross sections for the production of exactly four jets in proton-proton collisions are presented as a function of the transverse momentum pT and pseudorapidity \u03b7, together with the correlations in azimuthal angle and the p_T balance among the jets. The data sample was collected in 2010 at a center-of-mass energy of 7 TeV with the CMS detector at the LHC, with an integrated luminosity of 36\u2009\u2009pb^(\u22121). The cross section for exactly four jets, with two hard jets of p_T>50\u2009\u2009GeV each, together with two jets of p_T>20\u2009\u2009GeV each, within |\u03b7|<4.7 is measured to be \u03c3=330\u00b15(stat.)\u00b145(syst.)\u2009\u2009nb. It is found that fixed-order matrix element calculations including parton showers describe the measured differential cross sections in some regions of phase space only, and that adding contributions from double parton scattering brings the Monte Carlo predictions closer to the data.", "doi": "10.1103/PhysRevD.89.092010", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-05-01", "series_number": "9", "volume": "89", "issue": "9", "pages": "Art. No. 092010" }, { "id": "authors:xqw9x-6d167", "collection": "authors", "collection_id": "xqw9x-6d167", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140630-104222338", "type": "article", "title": "Measurement of the properties of a Higgs boson in the four-lepton final state", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The properties of a Higgs boson candidate are measured in the H\u2192ZZ\u21924\u2113 decay channel, with \u2113=e, \u03bc, using data from pp collisions corresponding to an integrated luminosity of 5.1\u2009\u2009fb^(\u22121) at the center-of-mass energy of \u221as=7\u2009\u2009TeV and 19.7\u2009\u2009fb^(\u22121) at \u221as=8\u2009\u2009TeV, recorded with the CMS detector at the LHC. The new boson is observed as a narrow resonance with a local significance of 6.8 standard deviations, a measured mass of 125.6\u00b10.4(stat)\u00b10.2(syst)\u2009\u2009GeV, and a total width \u22643.4\u2009\u2009GeV at the 95% confidence level. The production cross section of the new boson times its branching fraction to four leptons is measured to be 0.93^(+0.26)_(\u22120.23)(stat)^(+0.13)_(\u22120.09)(syst) times that predicted by the standard model. Its spin-parity properties are found to be consistent with the expectations for the standard-model Higgs boson. The hypotheses of a pseudoscalar and all tested spin-1 boson hypotheses are excluded at the 99% confidence level or higher. All tested spin-2 boson hypotheses are excluded at the 95% confidence level or higher.", "doi": "10.1103/PhysRevD.89.092007", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-05-01", "series_number": "9", "volume": "89", "issue": "9", "pages": "Art. No. 092007" }, { "id": "authors:c6dy6-4pr34", "collection": "authors", "collection_id": "c6dy6-4pr34", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140624-101801233", "type": "article", "title": "Measurement of the W\u03b3 and Z\u03b3 inclusive cross sections in pp collisions at \u221as = 7 TeV and limits on anomalous triple gauge boson couplings", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of W\u03b3 and Z\u03b3 production in proton-proton collisions at \u221as = 7\u2009\u2009TeV are used to extract limits on anomalous triple gauge couplings. The results are based on data recorded by the CMS experiment at the LHC that correspond to an integrated luminosity of 5.0\u2009\u2009fb^(\u22121). The cross sections are measured for photon transverse momenta p^\u03b3_T > 15\u2009\u2009GeV, and for separations between photons and final-state charged leptons in the pseudorapidity-azimuthal plane of \u0394R(\u2113,\u03b3)>0.7 in \u2113\u03bd\u03b3 and \u2113\u2113\u03b3 final states, where \u2113 refers either to an electron or a muon. A dilepton invariant mass requirement of m_(\u2113\u2113) > 50\u2009\u2009GeV is imposed for the Z\u03b3 process. No deviations are observed relative to predictions from the standard model, and limits are set on anomalous WW\u03b3, ZZ\u03b3, and Z\u03b3\u03b3 triple gauge couplings.", "doi": "10.1103/PhysRevD.89.092005", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-05", "series_number": "9", "volume": "89", "issue": "9", "pages": "Art. No. 092005" }, { "id": "authors:3j66v-cgk47", "collection": "authors", "collection_id": "3j66v-cgk47", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140731-135702751", "type": "article", "title": "Search for W' \u2192 tb decays in the lepton + jets final state in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for the production of a heavy gauge boson W\u2032 decaying into a top and a bottom quark, using a data set collected by the CMS experiment at TeX = 8 TeV and corresponding to an integrated luminosity of 19.5 fb^(\u22121). Various models of W\u2032-boson production are studied by allowing for an arbitrary combination of left- and right-handed couplings. The analysis is based on the detection of events with a lepton (e, \u03bc), jets, and missing transverse energy in the final state. No evidence for W\u2032-boson production is found and 95% confidence level upper limits on the production cross section times branching fraction are obtained. For W\u2032 bosons with purely right-handed couplings, and for those with left-handed couplings assuming no interference effects, the observed 95% confidence level limit is M(W\u2032) > 2.05 TeV. For W\u2032 bosons with purely left-handed couplings, including interference effects, the observed 95% confidence level limit is M(W\u2032) > 1.84 TeV. The results presented in this paper are the most stringent limits published to date.", "doi": "10.1007/JHEP05(2014)108", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-05", "series_number": "5", "volume": "2014", "issue": "5", "pages": "Art. No. 108" }, { "id": "authors:d7bb7-vat03", "collection": "authors", "collection_id": "d7bb7-vat03", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140630-071347018", "type": "article", "title": "Evidence for the 125 GeV Higgs boson decaying to a pair of \u03c4 leptons", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a standard model Higgs boson decaying into a pair of \u03c4 leptons is performed using events recorded by the CMS experiment at the LHC in 2011 and 2012. The dataset corresponds to an integrated luminosity of 4.9 fb^(\u22121) at a centre-of-mass energy of 7 TeV and 19.7 fb^(\u22121) at 8 TeV. Each \u03c4 lepton decays hadronically or leptonically to an electron or a muon, leading to six different final states for the \u03c4 -lepton pair, all considered in this analysis. An excess of events is observed over the expected background contributions, with a local significance larger than 3 standard deviations for m H values between 115 and 130 GeV. The best fit of the observed H \u2192 \u03c4\u03c4 signal cross section times branching fraction for m H = 125 GeV is 0.78 \u00b1 0.27 times the standard model expectation. These observations constitute evidence for the 125 GeV Higgs boson decaying to a pair of \u03c4 leptons.", "doi": "10.1007/JHEP05(2014)104", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-05", "series_number": "5", "volume": "2014", "issue": "5", "pages": "Art. No. 104" }, { "id": "authors:3c86p-p4h18", "collection": "authors", "collection_id": "3c86p-p4h18", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140611-103037938", "type": "article", "title": "Measurements of the tt charge asymmetry using the dilepton decay channel in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The tt charge asymmetry in proton-proton collisions at \u221as = 7 TeV is measured using the dilepton decay channel (ee, e\u03bc, or \u03bc\u03bc). The data correspond to a total integrated luminosity of 5.0 fb^(\u22121), collected by the CMS experiment at the LHC. The tt and lepton charge asymmetries, defined as the differences in absolute values of the rapidities between the reconstructed top quarks and antiquarks and of the pseudorapidities between the positive and negative leptons, respectively, are measured to be A_C = \u22120.010 \u00b1 0.017 (stat.) \u00b1 0.008 (syst.) and A^(lep)_C = 0.009 \u00b1 0.010 (stat.) \u00b1 0.006 (syst.). The lepton charge asymmetry is also measured as a function of the invariant mass, rapidity, and transverse momentum of the tt system. All measurements are consistent with the expectations of the standard model.", "doi": "10.1007/JHEP04(2014)191", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-04-30", "series_number": "4", "volume": "2014", "issue": "4", "pages": "Art. No. 191" }, { "id": "authors:sxxrs-8yf64", "collection": "authors", "collection_id": "sxxrs-8yf64", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140620-145323543", "type": "article", "title": "Search for Top-Quark Partners with Charge 5/3 in the Same-Sign Dilepton Final State", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the production of heavy partners of the top quark with charge 5/3 is performed in events with a pair of same-sign leptons. The data sample corresponds to an integrated luminosity of 19.5\u2009\u2009fb^(\u22121) and was collected at s\u221a=8\u2009\u2009TeV by the CMS experiment. No significant excess is observed in the data above the expected background, and the existence of top-quark partners with masses below 800 GeV is excluded at a 95% confidence level, assuming they decay exclusively to tW. This is the first limit on these particles from the LHC, and it is significantly more restrictive than previous limits.", "doi": "10.1103/PhysRevLett.112.171801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2014-04-30", "series_number": "17", "volume": "112", "issue": "17", "pages": "Art. No. 171801" }, { "id": "authors:tmf6k-sex32", "collection": "authors", "collection_id": "tmf6k-sex32", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140619-154653973", "type": "article", "title": "Search for Top Squark and Higgsino Production Using Diphoton Higgs Boson Decays", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented of a search for a \"natural\" supersymmetry scenario with gauge mediated symmetry breaking. It is assumed that only the supersymmetric partners of the top quark (the top squark) and the Higgs boson (Higgsino) are accessible. Events are examined in which there are two photons forming a Higgs boson candidate, and at least two b-quark jets. In 19.7\u2009\u2009fb^\u22121 of proton-proton collision data at s\u221a=8\u2009\u2009TeV, recorded in the CMS experiment, no evidence of a signal is found and lower limits at the 95% confidence level are set, excluding the top squark mass below 360 to 410 GeV, depending on the Higgsino mass.", "doi": "10.1103/PhysRevLett.112.161802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2014-04-25", "series_number": "16", "volume": "112", "issue": "16", "pages": "Art. No. 161802" }, { "id": "authors:paw7x-jq974", "collection": "authors", "collection_id": "paw7x-jq974", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140611-095526436", "type": "article", "title": "Event activity dependence of Y(nS) production in \u221asNN = 5.02 TeV pPb and \u221as = 2.76 TeV pp collisions", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of Y (1S), Y (2S), and Y (3S) is investigated in pPb and pp collisions at centre-of-mass energies per nucleon pair of 5.02 TeV and 2.76 TeV, respectively. The datasets correspond to integrated luminosities of about 31 nb^(\u22121) (pPb) and 5.4 pb^(\u22121) (pp), collected in 2013 by the CMS experiment at the LHC. Upsilons that decay into muons are reconstructed within the rapidity interval |y_(CM)| < 1.93 in the nucleon-nucleon centre-of-mass frame. Their production is studied as a function of two measures of event activity, namely the charged-particle multiplicity measured in the pseudorapidity interval |\u03b7| < 2.4, and the sum of transverse energy deposited at forward pseudorapidity, 4.0 < |\u03b7| < 5.2. The Y cross sections normalized by their event activity integrated values, Y (nS)/\u3008 Y (nS)\u3009, are found to rise with both measures of the event activity in pp and pPb. In both collision systems, the ratios of the excited to the ground state cross sections, Y (nS)/ Y (1S), are found to decrease with the charged-particle multiplicity, while as a function of the transverse energy the variation is less pronounced. The event activity integrated double ratios, [ Y (nS)/ Y (1S)]_(pPb) /[ Y (nS)/ Y (1S)]_(pp), are also measured and found to be 0.83 \u00b1 0.05 (stat.) \u00b1 0.05 (syst.) and 0.71 \u00b1 0.08 (stat.) \u00b1 0.09 (syst.) for Y (2S) and Y (3S), respectively.", "doi": "10.1007/JHEP04(2014)103", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-04-15", "series_number": "4", "volume": "2014", "issue": "4", "pages": "Art. No. 103" }, { "id": "authors:b4jd3-8nx97", "collection": "authors", "collection_id": "b4jd3-8nx97", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140521-085942809", "type": "article", "title": "Measurement of higher-order harmonic azimuthal anisotropy in PbPb collisions at \u221a(s_NN) = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "DiMarco", "given_name": "E.", "clpid": "DiMarco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements are presented by the CMS Collaboration at the Large Hadron Collider (LHC) of the higher-order harmonic coefficients that describe the azimuthal anisotropy of charged particles emitted in \u221a(s_NN)=2.76 TeV PbPb collisions. Expressed in terms of the Fourier components of the azimuthal distribution, the n=3\u20136 harmonic coefficients are presented for charged particles as a function of their transverse momentum (0.3", "doi": "10.1103/PhysRevC.89.044906", "issn": "0556-2813", "publisher": "American Physical Society", "publication": "Physical Review C", "publication_date": "2014-04-11", "series_number": "4", "volume": "89", "issue": "4", "pages": "Art. No. 044906" }, { "id": "authors:ax8e5-96w64", "collection": "authors", "collection_id": "ax8e5-96w64", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140515-113603984", "type": "article", "title": "Search for baryon number violation in top-quark decays", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for baryon number violation (BNV) in top-quark decays is performed using pp collisions produced by the LHC at \u221as = 8 TeV. The top-quark decay considered in this search results in one light lepton (muon or electron), two jets, but no neutrino in the final state. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of 19.5 fb^(\u22121). The event selection is optimized for top quarks produced in pairs, with one undergoing the BNV decay and the other the standard model hadronic decay to three jets. No significant excess of events over the expected yield from standard model processes is observed. The upper limits at 95% confidence level on the branching fraction of the BNV top-quark decay are calculated to be 0.0016 and 0.0017 for the muon and the electron channels, respectively. Assuming lepton universality, an upper limit of 0.0015 results from the combination of the two channels. These limits are the first that have been obtained on a BNV process involving the top quark.", "doi": "10.1016/j.physletb.2014.02.033", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-04-04", "volume": "731", "pages": "173-196" }, { "id": "authors:rzv5r-mws73", "collection": "authors", "collection_id": "rzv5r-mws73", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140502-100214924", "type": "article", "title": "Modification of jet shapes in PbPb collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The first measurement of jet shapes, defined as the fractional transverse momentum radial distribution, for inclusive jets produced in heavy-ion collisions is presented. Data samples of PbPb and pp collisions, corresponding to integrated luminosities of 150 \u03bcb^(\u22121) and 5.3 pb^(\u22121) respectively, were collected at a nucleon\u2013nucleon centre-of-mass energy of \u221asNN = 2.76 TeV with the CMS detector at the LHC. The jets are reconstructed with the anti-k_T algorithm with a distance parameter R=0.3, and the jet shapes are measured for charged particles with transverse momentum p_T>1 GeV/c. The jet shapes measured in PbPb collisions in different collision centralities are compared to reference distributions based on the pp data. A centrality-dependent modification of the jet shapes is observed in the more central PbPb collisions, indicating a redistribution of the energy inside the jet cone. This measurement provides information about the parton shower mechanism in the hot and dense medium produced in heavy-ion collisions.", "doi": "10.1016/j.physletb.2014.01.042", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-03-07", "volume": "730", "pages": "243-263" }, { "id": "authors:5br3s-ba685", "collection": "authors", "collection_id": "5br3s-ba685", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140502-105522605", "type": "article", "title": "Searches for light- and heavy-flavour three-jet resonances in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for three-jet hadronic resonance production in pp collisions at a centre-of-mass energy of 8 TeV has been conducted by the CMS Collaboration at the LHC with a data sample corresponding to an integrated luminosity of 19.4 fb^(\u22121). The search method is model independent, and events are selected that have high jet multiplicity and large values of jet transverse momenta. The signal models explored assume R -parity-violating supersymmetric gluino pair production and have final states with either only light-flavour jets or both light- and heavy-flavour jets. No significant deviation is found between the selected events and the expected standard model multijet and tt background. For a gluino decaying into light-flavour jets, a lower limit of 650 GeV on the gluino mass is set at a 95% confidence level, and for a gluino decaying into one heavy- and two light-flavour jets, gluino masses between 200 and 835 GeV are, for the first time, likewise excluded.", "doi": "10.1016/j.physletb.2014.01.049", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-03-07", "volume": "730", "pages": "193-214" }, { "id": "authors:62zmh-gxh71", "collection": "authors", "collection_id": "62zmh-gxh71", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140507-083910776", "type": "article", "title": "Study of double parton scattering using W + 2-jet events in proton-proton collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Double parton scattering is investigated in proton-proton collisions at \u221as = 7 TeV where the final state includes a W boson, which decays into a muon and a neutrino, and two jets. The data sample corresponds to an integrated luminosity of 5 fb^(\u22121), collected with the CMS detector at the LHC. Observables sensitive to double parton scattering\nare investigated after being corrected for detector effects and selection efficiencies. The fraction of W + 2-jet events due to double parton scattering is measured to be 0.055 \u00b1 0.002 (stat.) \u00b1 0.014 (syst.). The effective cross section, \u03c3_(eff), characterizing the effective transverse area of hard partonic interactions in collisions between protons is measured to be 20.7 \u00b1 0.8 (stat.) \u00b1 6.6 (syst.)mb.", "doi": "10.1007/JHEP03(2014)032", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-03", "series_number": "3", "volume": "2014", "issue": "3", "pages": "Art. No. 32" }, { "id": "authors:tcjz9-p8b95", "collection": "authors", "collection_id": "tcjz9-p8b95", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140429-094428888", "type": "article", "title": "Inclusive search for a vector-like T quark with charge 2/3 in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "contributor": [ { "family_name": "Doser", "given_name": "M.", "clpid": "Doser-M" } ], "abstract": "A search is performed for a massive new vector-like quark T, with charge (2/3), that is pair produced together with its antiparticle in proton\u2013proton collisions. The data were collected by the CMS experiment at the Large Hadron Collider in 2012 at \u221as = 8 TeV and correspond to an integrated luminosity of 19.5 fb^(\u22121). The T quark is assumed to decay into three different final states, bW, tZ, and tH. The search is carried out using events with at least one isolated lepton. No deviations from standard model expectations are observed, and lower limits are set on the T quark mass at 95% confidence level. The lower limit lies between 687 and 782 GeV for all possible values of the branching fractions into the three different final states assuming strong production. These limits are the most stringent constraints to date on the existence of such a quark.", "doi": "10.1016/j.physletb.2014.01.006", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-02-05", "volume": "729", "pages": "149-171" }, { "id": "authors:9kajr-e3k37", "collection": "authors", "collection_id": "9kajr-e3k37", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140327-082923496", "type": "article", "title": "Measurement of the tt production cross section in the dilepton channel in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The top-antitop quark (tt) production cross section is measured in proton-proton collisions at s\u221a = 8 TeV with the CMS experiment at the LHC, using a data sample corresponding to an integrated luminosity of 5.3 fb^(\u22121). The measurement is performed by analysing events with a pair of electrons or muons, or one electron and one muon, and at least two jets, one of which is identified as originating from hadronisation of a bottom quark. The measured cross section is 239 \u00b1 2 (stat.) \u00b1 11 (syst.) \u00b1 6 (lum.) pb, for an assumed top-quark mass of 172.5 GeV, in agreement with the prediction of the standard model.", "doi": "10.1007/JHEP02(2014)024", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-02", "series_number": "2", "volume": "2014", "issue": "2", "pages": "Art. No. 24" }, { "id": "authors:5bkw7-5am48", "collection": "authors", "collection_id": "5bkw7-5am48", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140623-105941827", "type": "article", "title": "Measurement of associated W + charm production in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements are presented of the associated production of a W boson and a charm-quark jet (W + c) in pp collisions at a center-of-mass energy of 7 TeV. The analysis is conducted with a data sample corresponding to a total integrated luminosity of 5 fb^(\u22121), collected by the CMS detector at the LHC. W boson candidates are identified by their decay into a charged lepton (muon or electron) and a neutrino. The W + c measurements are performed for charm-quark jets in the kinematic region p^(jet)_T > 25 GeV, |\u03b7^jet| < 2.5, for two different thresholds for the transverse momentum of the lepton from the W-boson decay, and in the pseudorapidity range |\u03b7^\u2113| < 2.1. Hadronic and inclusive semileptonic decays of charm hadrons are used to measure the following total cross sections: \u03c3(pp \u2192 W + c + X) \u00d7 B (W \u2192 \u2113\u03bd) = 107.7 \u00b1 3.3 (stat.) \u00b1 6.9 (syst.) pb ( p^\u2113_T > 25 GeV) and \u03c3(pp \u2192 W + c + X)\u00d7 B (W \u2192 \u2113\u03bd) = 84.1 \u00b1 2.0 (stat.) \u00b1 4.9 (syst.) pb ( p^\u2113_T > 35 GeV), and the cross section ratios \u03c3(pp \u2192 W+ + c\u00af + X)/\u03c3(pp \u2192 W\u2212 + c + X) = 0.954 \u00b1 0.025 (stat.) \u00b1 0.004 (syst.) ( p^\u2113_T > 25 GeV) and \u03c3(pp \u2192 W+ + c\u00af + X)/\u03c3(pp \u2192 W\u2212 + c + X) = 0.938 \u00b1 0.019 (stat.) \u00b1 0.006 (syst.) ( p^\u2113_T > 35 GeV). Cross sections and cross section ratios are also measured differentially with respect to the absolute value of the pseudorapidity of the lepton from the W-boson decay. These are the first measurements from the LHC directly sensitive to the strange quark and antiquark content of the proton. Results are compared with theoretical predictions and are consistent with the predictions based on global fits of parton distribution functions.", "doi": "10.1007/JHEP02(2014)013", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-02", "series_number": "2", "volume": "2014", "issue": "2", "pages": "Art. No. 13" }, { "id": "authors:cbc19-y5p68", "collection": "authors", "collection_id": "cbc19-y5p68", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140327-102402497", "type": "article", "title": "Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" } ], "abstract": "Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at \u221asNN \u2009=\u20092.76 TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 \u03bcb^(\u2009\u2212\u20091). The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v_2 to v_6, are extracted as a function of particle transverse momentum. At higher transverse momentum, the v_2 harmonic becomes significantly smaller than the higher-order v_n (n\u2009\u2265\u20093). The p _T-averaged v_2 and v_3 are found to be equal within 2%, while higher-order v_n decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-by-event fluctuating initial conditions is also presented.", "doi": "10.1007/JHEP02(2014)088", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-02", "series_number": "2", "volume": "2014", "issue": "2", "pages": "Art. No. 88" }, { "id": "authors:2zgp1-58d82", "collection": "authors", "collection_id": "2zgp1-58d82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140410-090403563", "type": "article", "title": "Search for the standard model Higgs boson produced in association with a W or a Z boson and decaying to bottom quarks", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the standard model Higgs boson (H) decaying to bb\u00af when produced in association with a weak vector boson (V) is reported for the following channels: W(\u03bc\u03bd)H, W(e\u03bd)H, W(\u03c4\u03bd)H, Z(\u03bc\u03bc)H, Z(ee)H, and Z(\u03bd\u03bd)H. The search is performed in data samples corresponding to integrated luminosities of up to 5.1 inverse femtobarns at s\u221a=7\u2009\u2009TeV and up to 18.9\u2009\u2009fb^\u22121 at s\u221a=8\u2009\u2009TeV, recorded by the CMS experiment at the LHC. An excess of events is observed above the expected background with a local significance of 2.1 standard deviations for a Higgs boson mass of 125 GeV, consistent with the expectation from the production of the standard model Higgs boson. The signal strength corresponding to this excess, relative to that of the standard model Higgs boson, is 1.0\u00b10.5.", "doi": "10.1103/PhysRevD.89.012003", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2014-01-21", "series_number": "1", "volume": "89", "issue": "1", "pages": "Art. No. 012003" }, { "id": "authors:jmjpn-a8m20", "collection": "authors", "collection_id": "jmjpn-a8m20", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140320-134407439", "type": "article", "title": "Determination of the top-quark pole mass and strong coupling constant from the tt production cross section in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The inclusive cross section for top-quark pair production measured by the CMS experiment in proton\u2013proton collisions at a center-of-mass energy of 7 TeV is compared to the QCD prediction at next-to-next-to-leading order with various parton distribution functions to determine the top-quark pole mass, m_t^(pole), or the strong coupling constant, \u03b1_S. With the parton distribution function set NNPDF2.3, a pole mass of 176.7_(\u22123.4)^(+3.8) GeV is obtained when constraining \u03b1_S at the scale of the Z boson mass, m_Z, to the current world average. Alternatively, by constraining m_t^(pole) to the latest average from direct mass measurements, a value of \u03b1_S(m_Z)=0.1151_(\u22120.0032)^(+0.0033) is extracted. This is the first determination of \u03b1_S using events from top-quark production.", "doi": "10.1016/j.physletb.2013.12.009", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2014-01-20", "volume": "728", "pages": "496-517" }, { "id": "authors:pw7bg-9ms60", "collection": "authors", "collection_id": "pw7bg-9ms60", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140324-092552186", "type": "article", "title": "Measurement of Higgs boson production and properties in the WW decay channel with leptonic final states", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the standard model Higgs boson decaying to a W-boson pair at the LHC is reported. The event sample corresponds to an integrated luminosity of 4.9 fb^(\u22121) and 19.4 fb^(\u22121) collected with the CMS detector in pp collisions at s\u221a = 7 and 8 TeV, respectively. The Higgs boson candidates are selected in events with two or three charged leptons. An excess of events above background is observed, consistent with the expectation from the standard model Higgs boson with a mass of around 125 GeV. The probability to observe an excess equal or larger than the one seen, under the background-only hypothesis, corresponds to a significance of 4.3 standard deviations for m_H = 125.6 GeV. The observed signal cross section times the branching fraction to WW for m_H = 125.6 GeV is 0.72^(+0.20)_(\u22120.18) times the standard model expectation. The spin-parity J^P = 0^+ hypothesis is favored against a narrow resonance with J^P = 2^+ or J^P = 0^\u2212 that decays to a W-boson pair. This result provides strong evidence for a Higgs-like boson decaying to a W-boson pair.", "doi": "10.1007/JHEP01(2014)096", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-01-17", "series_number": "1", "volume": "2014", "issue": "1", "pages": "Art. No. 96" }, { "id": "authors:82g6j-rjg19", "collection": "authors", "collection_id": "82g6j-rjg19", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140715-093629138", "type": "article", "title": "Search for new physics in events with same-sign dileptons and jets in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics is performed based on events with jets and a pair of isolated, same-sign leptons. The results are obtained using a sample of proton-proton collision data collected by the CMS experiment at a centre-of-mass energy of 8 TeV at the LHC, corresponding to an integrated luminosity of 19.5 fb^(\u22121). In order to be sensitive to a wide variety of possible signals beyond the standard model, multiple search regions defined by the missing transverse energy, the hadronic energy, the number of jets and b-quark jets, and the transverse momenta of the leptons in the events are considered. No excess above the standard model background expectation is observed and constraints are set on a number of models for new physics, as well as on the same-sign top-quark pair and quadruple-top-quark production cross sections. Information on event selection efficiencies is also provided, so that the results can be used to confront an even broader class of new physics models.", "doi": "10.1007/JHEP01(2014)163", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2014-01", "series_number": "1", "volume": "2014", "issue": "1", "pages": "Art. No. 163" }, { "id": "authors:rpm88-a3c86", "collection": "authors", "collection_id": "rpm88-a3c86", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150325-092903513", "type": "article", "title": "Measurement of top quark\u2013antiquark pair production in association with a W or Z boson in pp collisions at \u221as = 8TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the cross section for the production of top quark\u2013antiquark pairs ( tt) in association with a vector boson V (W or Z) in proton-proton collisions at \u221as=8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb^(\u22121) recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and \u03bc) channels: a same-sign dilepton analysis targeting ttW events, and trilepton and four-lepton analyses designed for ttZ events. In the same-sign dilepton channel, the ttW cross section is measured as \u03c3tt\u00afW=170^(+90)_(\u221280)(stat)\u00b170(syst)fb , corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the ttZ cross section, ttZ=200^(+80)_(\u221270)(stat)^(+40)_(\u221230)(syst)fb^(\u22121), is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive ttV process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.", "doi": "10.1140/epjc/s10052-014-3060-7", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2014", "series_number": "9", "volume": "74", "issue": "9", "pages": "Art. No. 3060" }, { "id": "authors:mxpwb-zg184", "collection": "authors", "collection_id": "mxpwb-zg184", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140130-141557374", "type": "article", "title": "Rapidity distributions in exclusive Z + jet and \u03b3 + jet events in pp collisions at \u221as = 7\u2009\u2009TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Rapidity distributions are presented for events containing either a Z boson or a photon with a single jet in proton-proton collisions produced at the CERN LHC. The data, collected with the CMS detector at \u221as = 7\u2009\u2009TeV, correspond to an integrated luminosity of 5.0\u2009\u2009fb^(\u22121). The individual rapidity distributions of the boson and the jet are consistent within 5% with expectations from perturbative QCD. However, QCD predictions for the sum and the difference in rapidities of the two final-state objects show discrepancies with CMS data. In particular, next-to-leading-order QCD calculations, and two common Monte Carlo event generators using different methods to match matrix-element partons with parton showers, appear inconsistent with the data as well as with each other.", "doi": "10.1103/PhysRevD.88.112009", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2013-12-23", "series_number": "11", "volume": "88", "issue": "11", "pages": "Art. No. 112009" }, { "id": "authors:dq5zc-cc706", "collection": "authors", "collection_id": "dq5zc-cc706", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140203-110017842", "type": "article", "title": "Search for top-squark pair production in the single-lepton final state in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper presents a search for the pair production of top squarks in events with a single isolated electron or muon, jets, large missing transverse momentum, and large transverse mass. The data sample corresponds to an integrated luminosity of 19.5 fb^(\u22121) of pp collisions collected in 2012 by the CMS experiment at the LHC at a center-of-mass energy of \u221as=8 TeV . No significant excess in data is observed above the expectation from standard model processes. The results are interpreted in the context of supersymmetric models with pair production of top squarks that decay either to a top quark and a neutralino or to a bottom quark and a chargino. For small mass values of the lightest supersymmetric particle, top-squark mass values up to around 650 GeV are excluded.", "doi": "10.1140/epjc/s10052-013-2677-2", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2013-12-21", "series_number": "12", "volume": "73", "issue": "12", "pages": "Art. No. 2677" }, { "id": "authors:rpatp-4x522", "collection": "authors", "collection_id": "rpatp-4x522", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140116-115254916", "type": "article", "title": "Measurement of the prompt J/\u03c8 and \u03c8(2S) polarizations in pp collisions at \u221as = 7TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The polarizations of prompt J/\u03c8 and \u03c8(2S) mesons are measured in proton\u2013proton collisions at \u221as = 7TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 fb^(\u22121). The prompt J/\u03c8 and \u03c8(2S) polarization parameters \u03bb_\u03d1, \u03bb_\u03c6, and \u03bb_(\u03d1\u03c6), as well as the frame-invariant quantity \u221as = 7TeV, are measured from the dimuon decay angular distributions in three different polarization frames. The J/\u03c8 results are obtained in the transverse momentum range 14", "doi": "10.1016/j.physletb.2013.10.055", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2013-12-18", "series_number": "4-5", "volume": "727", "issue": "4-5", "pages": "381-402" }, { "id": "authors:0agxf-rsa61", "collection": "authors", "collection_id": "0agxf-rsa61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140130-071655465", "type": "article", "title": "Jet and underlying event properties as a function of charged-particle multiplicity in proton\u2013proton collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Characteristics of multi-particle production in proton-proton collisions at \u221as = 7 TeV are studied as a function of the charged-particle multiplicity, N_(ch). The produced particles are separated into two classes: those belonging to jets and those belonging to the underlying event. Charged particles are measured with pseudorapidity |\u03b7|<2.4 and transverse momentum p_T>0.25 GeV/c. Jets are reconstructed from charged-particles only and required to have p_T>5 GeV/c. The distributions of jet p_T, average p_T of charged particles belonging to the underlying event or to jets, jet rates, and jet shapes are presented as functions of N_(ch) and compared to the predictions of the PYTHIA and HERWIG event generators. Predictions without multi-parton interactions fail completely to describe the N_(ch)-dependence observed in the data. For increasing N_(ch), PYTHIA systematically predicts higher jet rates and harder p_T spectra than seen in the data, whereas HERWIG shows the opposite trends. At the highest multiplicity, the data\u2013model agreement is worse for most observables, indicating the need for further tuning and/or new model ingredients.", "doi": "10.1140/epjc/s10052-013-2674-5", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2013-12-11", "series_number": "12", "volume": "73", "issue": "12", "pages": "Art. No. 2674" }, { "id": "authors:gk98p-2h215", "collection": "authors", "collection_id": "gk98p-2h215", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140129-073516991", "type": "article", "title": "Measurement of the cross section and angular correlations for associated production of a Z boson with b hadrons in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A study of proton-proton collisions in which two b hadrons are produced in association with a Z boson is reported. The collisions were recorded at a centre-of-mass energy of 7 TeV with the CMS detector at the LHC, for an integrated luminosity of 5.2 fb^(\u22121). The b hadrons are identified by means of displaced secondary vertices, without the use of reconstructed jets, permitting the study of b-hadron pair production at small angular separation. Differential cross sections are presented as a function of the angular separation of the b hadrons and the Z boson. In addition, inclusive measurements are presented. For both the inclusive and differential studies, different ranges of Z boson momentum are considered, and each measurement is compared to the predictions from different event generators at leading-order and next-to-leading-order accuracy.", "doi": "10.1007/JHEP12(2013)039", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-12-06", "series_number": "12", "volume": "2013", "issue": "12", "pages": "Art. No. 39" }, { "id": "authors:kp09w-pnf92", "collection": "authors", "collection_id": "kp09w-pnf92", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140122-141723790", "type": "article", "title": "Measurement of the differential and double-differential Drell-Yan cross sections in proton-proton collisions at\n \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the differential and double-differential Drell-Yan cross sections are presented using an integrated luminosity of 4.5 (4.8) fb^(\u22121) in the dimuon (dielectron) channel of proton-proton collision data recorded with the CMS detector at the LHC at s\u221a = 7 TeV. The measured inclusive cross section in the Z-peak region (60\u2013120 GeV) is \u03c3(\u2113\u2113) = 986.4\u2009\u00b1\u20090.6 (stat.)\u2009\u00b1\u20095.9 (exp. syst.)\u2009\u00b1\u200921.7 (th. syst.)\u2009\u00b1\u200921.7 (lum.) pb for the combination of the dimuon and dielectron channels. Differential cross sections d\u03c3/dm for the dimuon, dielectron, and combined channels are measured in the mass range 15 to 1500 GeV and corrected to the full phase space. Results are also presented for the measurement of the double-differential cross section d^2\u03c3/dm d|y| in the dimuon channel over the mass range 20 to 1500 GeV and absolute dimuon rapidity from 0 to 2.4. These measurements are compared to the predictions of perturbative QCD calculations at next-to-leading and next-to-next-to-leading orders using various sets of parton distribution functions.", "doi": "10.1007/JHEP12(2013)030", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-12", "series_number": "12", "volume": "2013", "issue": "12", "pages": "Art. No. 30" }, { "id": "authors:k7gzm-r3t82", "collection": "authors", "collection_id": "k7gzm-r3t82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140129-093351487", "type": "article", "title": "Angular analysis and branching fraction measurement of the decay B^0\u2192K^(\u22170)\u03bc^+\u03bc^\u2212", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The angular distributions and the differential branching fraction of the decay B^0\u2192K^\u204e(892)^0\u03bc^+\u03bc^\u2212 are studied using a data sample corresponding to an integrated luminosity of 5.2 fb^(\u22121) collected with the CMS detector at the LHC in pp collisions at \u221as = 7 TeV. From more than 400 signal decays, the forward\u2013backward asymmetry of the muons, the K^\u204e(892)^0 longitudinal polarization fraction, and the differential branching fraction are determined as a function of the square of the dimuon invariant mass. The measurements are in good agreement with standard model predictions.", "doi": "10.1016/j.physletb.2013.10.017", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2013-11-25", "series_number": "1-3", "volume": "727", "issue": "1-3", "pages": "77-100" }, { "id": "authors:k7g32-gxq72", "collection": "authors", "collection_id": "k7g32-gxq72", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140124-073933689", "type": "article", "title": "Search for a new bottomonium state decaying to \u03d2(1S)\u03c0^+\u03c0^\u2212 in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The results of a search for the bottomonium counterpart, denoted as X_b, of the exotic charmonium state X(3872) is presented. The analysis is based on a sample of pp collisions at \u221as = 8 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 20.7 fb^(\u22121). The search looks for the exclusive decay channel X_b\u2192\u03d2(1S)\u03c0^+\u03c0^\u2212 followed by \u03d2(1S)\u2192\u03bc^+\u03bc^\u2212. No evidence for an X_b signal is observed. Upper limits are set at the 95% confidence level on the ratio of the inclusive production cross sections times the branching fractions to \u03d2(1S)\u03c0^+\u03c0^\u2212 of the X_b and the \u03d2(2S). The upper limits on the ratio are in the range 0.9\u20135.4% for X_b masses between 10 and 11 GeV. These are the first upper limits on the production of a possible X_b at a hadron collider.", "doi": "10.1016/j.physletb.2013.10.016", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2013-11-25", "series_number": "1-3", "volume": "727", "issue": "1-3", "pages": "57-76" }, { "id": "authors:0qs2w-grq11", "collection": "authors", "collection_id": "0qs2w-grq11", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140130-111550751", "type": "article", "title": "Measurement of the \u03d2(1S), \u03d2(2S), and \u03d2(3S) cross sections in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "contributor": [ { "family_name": "Doser", "given_name": "M.", "clpid": "Doser-M" } ], "abstract": "The \u03d2(1S), \u03d2(2S), and \u03d2(3S) production cross sections are measured using a data sample corresponding to an integrated luminosity of 35.8 \u00b1 1.4 pb^(\u22121) of proton\u2013proton collisions at \u221as = 7 TeV , collected with the CMS detector at the LHC. The \u03d2 resonances are identified through their decays to dimuons. Integrated over the \u03d2 transverse momentum range p^ \u03d2 _T < 50 GeV/c and rapidity range |y^\u03d2| < 2.4, and assuming unpolarized \u03d2 production, the products of the \u03d2 production cross sections and dimuon branching fractions are\n\u03c3 (pp \u2192 \u03d2(1S) X ) \u2022 B (\u03d2(1S) \u2192 \u00b5^(+) \u00b5^(-)) = (8.55 \u00b1 0.05^(+0.56)_(-0.50) \u00b1 0.34) nb,\n\u03c3 (pp \u2192 \u03d2(2S) X ) \u2022 B (\u03d2(2S) \u2192 \u00b5^(+) \u00b5^(-)) = (2.21 \u00b1 0.03^(+0.16)_(-0.14) \u00b1 0.09) nb,\n\u03c3 (pp \u2192 \u03d2(3S) X ) \u2022 B (\u03d2(3S) \u2192 \u00b5^(+) \u00b5^(-)) = (1.11 \u00b1 0.02^(+0.10)_(-0.08) \u00b1 0.04) nb,\n\nwhere the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty in the integrated luminosity. The differential cross sections in bins of transverse momentum and rapidity, and the cross section ratios are presented. Cross section measurements performed within a restricted muon kinematic range and not corrected for acceptance are also provided. These latter measurements are independent of \u03d2 polarization assumptions. The results are compared to theoretical predictions and previous measurements.", "doi": "10.1016/j.physletb.2013.10.033", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2013-11-25", "series_number": "1-3", "volume": "727", "issue": "1-3", "pages": "101-125" }, { "id": "authors:r3ken-k2b32", "collection": "authors", "collection_id": "r3ken-k2b32", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140519-113536299", "type": "article", "title": "Search for Top Squarks in R-Parity-Violating Supersymmetry Using Three or More Leptons and b-Tagged Jets", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for anomalous production of events with three or more isolated leptons and bottom-quark jets produced in pp collisions at \u221as = 8\u2009\u2009TeV is presented. The analysis is based on a data sample corresponding to an integrated luminosity of 19.5\u2009\u2009fb^\u22121 collected by the CMS experiment at the LHC in 2012. No excess above the standard model expectations is observed. The results are interpreted in the context of supersymmetric models with signatures that have low missing transverse energy arising from light top-squark pair production with R-parity-violating decays of the lightest supersymmetric particle. In two models with different R-parity-violating couplings, top squarks are excluded below masses of 1020 GeV and 820 GeV when the lightest supersymmetric particle has a mass of 200 GeV.", "doi": "10.1103/PhysRevLett.111.221801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2013-11-25", "series_number": "22", "volume": "111", "issue": "22", "pages": "Art. No. 221801" }, { "id": "authors:26dvv-0es74", "collection": "authors", "collection_id": "26dvv-0es74", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140123-092022733", "type": "article", "title": "Search for a Higgs boson decaying into a Z and a photon in pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a Higgs boson decaying into a Z boson and a photon is described. The analysis is performed using proton\u2013proton collision datasets recorded by the CMS detector at the LHC. Events were collected at center-of-mass energies of 7 TeV and 8 TeV, corresponding to integrated luminosities of 5.0 fb^(\u22121) and 19.6 fb^(\u22121), respectively. The selected events are required to have opposite-sign electron or muon pairs. No excess above standard model predictions has been found in the 120\u2013160 GeV mass range and the first limits on the Higgs boson production cross section times the H\u2192Z\u03b3 branching fraction at the LHC have been derived. The observed at 95% confidence level limits are between about 4 and 25 times the standard model cross section times the branching fraction. For a standard model Higgs boson mass of 125 GeV the expected limit at the 95% confidence level is 10 and the observed limit is 9.5. Models predicting the Higgs boson production cross section times the H\u2192Z\u03b3 branching fraction to be larger than one order of magnitude of the standard model prediction are excluded for most of the 125\u2013157 GeV mass range.", "doi": "10.1016/j.physletb.2013.09.057", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2013-11-04", "series_number": "4-5", "volume": "726", "issue": "4-5", "pages": "587-609" }, { "id": "authors:nszsq-dxg79", "collection": "authors", "collection_id": "nszsq-dxg79", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131224-101251086", "type": "article", "title": "Searches for new physics using the tt invariant mass distribution in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Searches for anomalous top quark-antiquark production are presented, based on pp collisions at s\u221a=8\u2009\u2009TeV. The data, corresponding to an integrated luminosity of 19.7\u2009\u2009fb^(\u22121), were collected with the CMS detector at the LHC. The observed tt invariant mass spectrum is found to be compatible with the standard model prediction. Limits on the production cross section times branching fraction probe, for the first time, a region of parameter space for certain models of new physics not yet constrained by precision measurements.", "doi": "10.1103/PhysRevLett.111.211804", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2013-11", "series_number": "21", "volume": "111", "issue": "21", "pages": "Art. No. 211804" }, { "id": "authors:yvedg-wf040", "collection": "authors", "collection_id": "yvedg-wf040", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140218-100607316", "type": "article", "title": "The performance of the CMS muon detector in proton-proton collisions at \u221as = 7 TeV at the LHC", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The performance of all subsystems of the CMS muon detector has been studied by using a sample of proton-proton collision data at \u221as = 7 TeV collected at the LHC in 2010 that corresponds to an integrated luminosity of approximately 40 pb^(-1). The measured distributions of the major operational parameters of the drift tube (DT), cathode strip chamber (CSC), and resistive plate chamber (RPC) systems met the design specifications. The spatial resolution per chamber was 80\u2013120 \u03bcm in the DTs, 40\u2013150 \u03bcm in the CSCs, and 0.8\u20131.2 cm in the RPCs. The time resolution achievable was 3 ns or better per chamber for all 3 systems. The efficiency for reconstructing hits and track segments originating from muons traversing the muon chambers was in the range 95\u201398%. The CSC and DT systems provided muon track segments for the CMS trigger with over 96% efficiency, and identified the correct triggering bunch crossing in over 99.5% of such events. The measured performance is well reproduced by Monte Carlo simulation of the muon system down to the level of individual channel response. The results confirm the high efficiency of the muon system, the robustness of the design against hardware failures, and its effectiveness in the discrimination of backgrounds.", "doi": "10.1088/1748-0221/8/11/P11002", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2013-11", "series_number": "11", "volume": "8", "issue": "11", "pages": "Art. No. P11002" }, { "id": "authors:nrc2d-b8s20", "collection": "authors", "collection_id": "nrc2d-b8s20", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131203-100119947", "type": "article", "title": "Measurement of the W-boson helicity in top-quark decays from tt production in lepton+jets events in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The W-boson helicity fractions in top-quark decays are measured with tt events in the lepton+jets final state, using proton-proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 fb^(\u22121). The measured fractions of longitudinal, left-, and right-handed helicity are F_0 = 0.682 \u00b1 0.030 (stat.) \u00b1 0.033 (syst.), F_L = 0.310 \u00b1 0.022 (stat.) \u00b1 0.022 (syst.), and F_R = 0.008 \u00b1 0.012 (stat.) \u00b1 0.014 (syst.), consistent with the standard model predictions. The measured fractions are used to probe the existence of anomalous Wtb couplings. Exclusion limits on the real components of the anomalous couplings g_L , g_R are also derived.", "doi": "10.1007/JHEP10(2013)167", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-10-24", "series_number": "10", "volume": "2013", "issue": "10", "pages": "Art. No. 167" }, { "id": "authors:73x04-4b658", "collection": "authors", "collection_id": "73x04-4b658", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140512-110205274", "type": "article", "title": "Measurement of the hadronic activity in events with a\n Z and two jets and extraction of the cross section for\n the electroweak production of a Z with two jets in pp\n collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" } ], "abstract": "The first measurement of the electroweak production cross section of a Z boson with two jets (Zjj) in pp collisions at s\u221a=7 TeV is presented, based on a data sample recorded by the CMS experiment at the LHC with an integrated luminosity of 5 fb^(\u22121). The cross section is measured for the \u2113\u2113jj (\u2113 = e, \u03bc) final state in the kinematic region m_(\u2113\u2113) > 50 GeV, m_(jj) > 120 GeV, transverse momenta p^j_T>25 GeV and pseudorapidity |\u03b7_j| < 4.0. The measurement, combining the muon and electron channels, yields \u03c3 = 154 \u00b1 24 (stat.) \u00b1 46 (exp. syst.) \u00b1 27 (th. syst.) \u00b1 3 (lum.) fb, in agreement with the theoretical cross section. The hadronic activity, in the rapidity interval between the jets, is also measured. These results establish an important foundation for the more general study of vector boson fusion processes, of relevance for Higgs boson searches and for measurements of electroweak gauge couplings and vector boson scattering.", "doi": "10.1007/JHEP10(2013)062", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-10-10", "series_number": "10", "volume": "2013", "issue": "10", "pages": "Art. No. 62" }, { "id": "authors:kzfd1-ddv48", "collection": "authors", "collection_id": "kzfd1-ddv48", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131106-074332549", "type": "article", "title": "Search for gluino mediated bottom- and top-squark production in multijet final states in pp collisions at 8TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for supersymmetry is presented based on events with large missing transverse energy, no isolated electron or muon, and at least three jets with one or more identified as a bottom-quark jet. A simultaneous examination is performed of the numbers of events in exclusive bins of the scalar sum of jet transverse momentum values, missing transverse energy, and bottom-quark jet multiplicity. The sample, corresponding to an integrated luminosity of 19.4 fb^(\u22121), consists of proton\u2013proton collision data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the LHC in 2012. The observed numbers of events are found to be consistent with the standard model expectation, which is evaluated with control samples in data. The results are interpreted in the context of two simplified supersymmetric scenarios in which gluino pair production is followed by the decay of each gluino to an undetected lightest supersymmetric particle and either a bottom or top quark\u2013antiquark pair, characteristic of gluino mediated bottom- or top-squark production. Using the production cross section calculated to next-to-leading-order plus next-to-leading-logarithm accuracy, and in the limit of a massless lightest supersymmetric particle, we exclude gluinos with masses below 1170 GeV and 1020 GeV for the two scenarios, respectively.", "doi": "10.1016/j.physletb.2013.06.058", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2013-10-01", "series_number": "4-5", "volume": "725", "issue": "4-5", "pages": "243-270" }, { "id": "authors:mfqnv-mvc55", "collection": "authors", "collection_id": "mfqnv-mvc55", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131203-140011978", "type": "article", "title": "Measurement of the W^+W^\u2212 cross section in pp collisions at \u221as = 7 TeV and limits on anomalous WW\u03b3 and WWZ couplings", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" } ], "abstract": "A measurement of W^+W^\u2212 production in pp collisions at s\u221a=7 TeV is presented. The data were collected with the CMS detector at the LHC, and correspond to an integrated luminosity of 4.92\u00b10.11 fb^(\u22121). The W^+W^\u2212 candidates consist of two oppositely charged leptons, electrons or muons, accompanied by large missing transverse energy. The W^+W^\u2212 production cross section is measured to be 52.4\u00b12.0 (stat.)\u00b14.5 (syst.)\u00b11.2 (lum.) pb. This measurement is consistent with the standard model prediction of 47.0\u00b12.0 pb at next-to-leading order. Stringent limits on the WW\u03b3 and WWZ anomalous triple gauge-boson couplings are set.", "doi": "10.1140/epjc/s10052-013-2610-8", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2013-10", "series_number": "10", "volume": "73", "issue": "10", "pages": "Art. No. 2610" }, { "id": "authors:1xj3n-6vs47", "collection": "authors", "collection_id": "1xj3n-6vs47", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140407-110351249", "type": "article", "title": "Measurement of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section in pp collisions at s\u221a=7 TeV and first determination of the strong coupling constant in the TeV range", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section as a function of the average transverse momentum, \u27e8pT1,2\u27e9 , of the two leading jets in the event. The data sample was collected during 2011 at a proton\u2013proton centre-of-mass energy of 7 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 5.0 fb^\u22121. The strong coupling constant at the scale of the Z boson mass is determined to be \u03b1_S (M_Z)=0.1148\u00b10.0014 (exp.)\u00b10.0018 (PDF)\u00b10.0050(theory), by comparing the ratio in the range 0.42<\u27e8p_(T1,2)\u27e9<1.39 TeV to the predictions of perturbative QCD at next-to-leading order. This is the first determination of \u03b1 S (M Z) from measurements at momentum scales beyond 0.6 TeV. The predicted ratio depends only indirectly on the evolution of the parton distribution functions of the proton such that this measurement also serves as a test of the evolution of the strong coupling constant. No deviation from the expected behaviour is observed.", "doi": "10.1140/epjc/s10052-013-2604-6", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2013-10", "series_number": "10", "volume": "73", "issue": "10", "pages": "Art. No. 2604" }, { "id": "authors:2xt7v-r5b06", "collection": "authors", "collection_id": "2xt7v-r5b06", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131205-102404535", "type": "article", "title": "Measurement of the production cross section for Z\u03b3 \u2192 \u03bd\u03bd\u03b3 in pp collisions at \u221as = 7 TeV and limits on ZZ\u03b3 and Z\u03b3\u03b3 triple gauge boson couplings", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the Z\u03b3\u2192\u03bd\u03bd\u03b3 cross section in pp collisions at s\u221a=7 TeV is presented, using data corresponding to an integrated luminosity of 5.0 fb^(\u22121) collected with the CMS detector. This measurement is based on the observation of events with an imbalance of transverse energy in excess of 130 GeV and a single photon in the absolute pseudorapidity range |\u03b7|\u2009<\u20091.4 with transverse energy above 145 GeV. The Z\u03b3\u2192\u03bd\u03bd\u03b3 production cross section is measured to be 21.1\u2009\u00b1\u20094.2 (stat.)\u2009\u00b1\u20094.3 (syst.)\u2009\u00b1\u20090.5 (lum.) fb, which agrees with the standard model prediction of 21.9\u2009\u00b1\u20091.1 fb. The results are combined with the CMS measurement of Z\u03b3 production in the \u2113^+ \u2113^\u2212 \u03b3 final state (where \u2113 is an electron or a muon) to yield the most stringent limits to date on triple gauge boson couplings: \u2223h^Z_3\u2223<2.7\u00d710^(\u22123) , \u2223h^Z_4\u2223<1.3\u00d710^(\u22125) for ZZ\u03b3 and \u2223h^\u03b3_3\u2223<2.9\u00d710^(\u22123) , \u2223h^\u03b3_4\u2223<1.5\u00d710^(\u22125) for Z\u03b3\u03b3 couplings.", "doi": "10.1007/JHEP10(2013)164", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-10", "series_number": "10", "volume": "2013", "issue": "10", "pages": "Art. No. 164" }, { "id": "authors:bknbn-94p62", "collection": "authors", "collection_id": "bknbn-94p62", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131025-115000617", "type": "article", "title": "Search for supersymmetry in hadronic final states with missing transverse energy using the variables \u03b1_T and b-quark multiplicity in pp collisions at \u221as =8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb^(\u22121) collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, \u03b1_T, is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressed-spectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950\u20131125 GeV are excluded depending on the assumed model. For the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first- or second-generation squark, increasing to 600 GeV for bottom squarks.", "doi": "10.1140/epjc/s10052-013-2568-6", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2013-09-18", "series_number": "9", "volume": "73", "issue": "9", "pages": "Art. No. 2568" }, { "id": "authors:gxfyf-4ns32", "collection": "authors", "collection_id": "gxfyf-4ns32", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131021-150338537", "type": "article", "title": "Measurement of the B^0_s \u2192 \u00b5^+\u00b5^- Branching Fraction and Search for B^0 \u2192 \u00b5^+\u00b5^- with the CMS Experiment", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Pena", "given_name": "C.", "clpid": "Pena-C" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for the rare decays B_s^0\u2192\u03bc^+\u03bc^- and B^0\u2192\u03bc^+\u03bc^- in pp collisions at \u221as=7 and 8 TeV, with data samples corresponding to integrated luminosities of 5 and 20\u2009\u2009fb^(-1), respectively, collected by the CMS experiment at the LHC. An unbinned maximum-likelihood fit to the dimuon invariant mass distribution gives a branching fraction B(B_s^0\u2192\u03bc^+\u03bc^-)=(3.0_(-0.9)^(+1.0))\u00d710^(-9), where the uncertainty includes both statistical and systematic contributions. An excess of B_s^0\u2192\u03bc^+\u03bc^- events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B^0\u2192\u03bc^+\u03bc^- an upper limit of B(B^0\u2192\u03bc^+\u03bc^-)<1.1\u00d710^(-9) at the 95% confidence level is determined. Both results are in agreement with the expectations from the standard model.", "doi": "10.1103/PhysRevLett.111.101804", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2013-09-06", "series_number": "10", "volume": "111", "issue": "10", "pages": "Art. No. 101804" }, { "id": "authors:vvz3h-73854", "collection": "authors", "collection_id": "vvz3h-73854", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131011-133244534", "type": "article", "title": "Measurement of neutral strange particle production in the underlying event in proton-proton collisions at \u221as=7\u2009\u2009TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements are presented of the production of primary K^(0)_(S) and \u039b particles in proton-proton collisions at \u221as=7\u2009\u2009TeV in the region transverse to the leading charged-particle jet in each event. The average multiplicity and average scalar transverse momentum sum of K^(0)_(S) and \u039b particles measured at pseudorapidities |\u03b7|<2 rise with increasing charged-particle jet pT in the range 1\u201310\u2009\u2009GeV/c and saturate in the region 10\u201350\u2009\u2009GeV/c. The rise and saturation of the strange-particle yields and transverse momentum sums in the underlying event are similar to those observed for inclusive charged particles, which confirms the impact-parameter picture of multiple parton interactions. The results are compared to recent tunes of the pythia Monte Carlo event generator. The pythia simulations underestimate the data by 15%\u201330% for K^(0)_(S) mesons and by about 50% for \u039b baryons, a deficit similar to that observed for the inclusive strange-particle production in non-single-diffractive proton-proton collisions. The constant strange- to charged-particle activity ratios with respect to the leading jet p_T and similar trends for mesons and baryons indicate that the multiparton-interaction dynamics is decoupled from parton hadronization, which occurs at a later stage.", "doi": "10.1103/PhysRevD.88.052001", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2013-09-01", "series_number": "5", "volume": "88", "issue": "5", "pages": "Art. No. 052001" }, { "id": "authors:n9rba-0dj54", "collection": "authors", "collection_id": "n9rba-0dj54", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130909-142957665", "type": "article", "title": "Searches for Higgs bosons in pp collisions at \u221as = 7 and 8 TeV\n in the context of four-generation and fermiophobic models", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Searches are reported for Higgs bosons in the context of either the standard model extended to include a fourth generation of fermions (SM4) with masses of up to 600 GeV or fermiophobic models. For the former, results from three decay modes (\u03c4\u03c4, WW, and ZZ) are combined, whilst for the latter the diphoton decay is exploited. The analysed proton\u2013proton collision data correspond to integrated luminosities of up to 5.1 fb^(\u22121) at 7 TeV and up to 5.3 fb^(\u22121) at 8 TeV. The observed results exclude the SM4 Higgs boson in the mass range 110\u2013600 GeV at 99% confidence level (CL), and in the mass range 110\u2013560 GeV at 99.9% CL. A fermiophobic Higgs boson is excluded in the mass range 110\u2013147 GeV at 95% CL, and in the range 110\u2013133 GeV at 99% CL. The recently observed boson with a mass near 125 GeV is not consistent with either an SM4 or a fermiophobic Higgs boson.", "doi": "10.1016/j.physletb.2013.06.043", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2013-08-09", "series_number": "1-3", "volume": "725", "issue": "1-3", "pages": "36-59" }, { "id": "authors:3r1cm-yva36", "collection": "authors", "collection_id": "3r1cm-yva36", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130906-145200074", "type": "article", "title": "Multiplicity and transverse momentum dependence of two- and four-particle correlations in pPb and PbPb collisions", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of two- and four-particle angular correlations for charged particles emitted in pPb collisions are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 31 nb^(\u22121), were collected during the 2013 LHC pPb run at a nucleon\u2013nucleon center-of-mass energy of 5.02 TeV by the CMS experiment. The results are compared to 2.76 TeV semi-peripheral PbPb collision data, collected during the 2011 PbPb run, covering a similar range of particle multiplicities. The observed correlations are characterized by the near-side (|\u0394\u03d5|\u22480) associated pair yields and the azimuthal anisotropy Fourier harmonics (v_n). The second-order (v_2) and third-order (v_3) anisotropy harmonics are extracted using the two-particle azimuthal correlation technique. A four-particle correlation method is also applied to obtain the value of v_2 and further explore the multi-particle nature of the correlations. Both associated pair yields and anisotropy harmonics are studied as a function of particle multiplicity and transverse momentum. The associated pair yields, the four-particle v_2, and the v_3 become apparent at about the same multiplicity. A remarkable similarity in the v_3 signal as a function of multiplicity is observed between the pPb and PbPb systems. Predictions based on the color glass condensate and hydrodynamic models are compared to the experimental results.", "doi": "10.1016/j.physletb.2013.06.028", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2013-07-23", "series_number": "4-5", "volume": "724", "issue": "4-5", "pages": "213-240" }, { "id": "authors:0w28n-61p07", "collection": "authors", "collection_id": "0w28n-61p07", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131003-094854279", "type": "article", "title": "Measurement of the \u039b^0_b lifetime in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the \u039b^0_b lifetime using the decay \u039b^0_b \u2192 J/\u03c8\u039b in proton-proton collisions at \u221as = 7TeV is presented. The data set, corresponding to an integrated luminosity of about 5 fb^(-1), was recorded with the CMS experiment at the Large Hadron Collider using triggers that selected dimuon events in the J/\u03c8 mass region. The \u039b^0_b lifetime is measured to be 1.503 \u00b1 0.052 (stat.) \u00b1 0.031 (syst.) ps.", "doi": "10.1007/JHEP07(2013)163", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-07", "series_number": "7", "volume": "2013", "issue": "7", "pages": "Art. No. 163" }, { "id": "authors:3x6sb-g3834", "collection": "authors", "collection_id": "3x6sb-g3834", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131002-105623527", "type": "article", "title": "Study of exclusive two-photon production of W^+W^\u2212 in pp collisions at s\u221a = 7 TeV and constraints on anomalous quartic gauge couplings", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for exclusive or quasi-exclusive W^+W^\u2212 production by photon-photon interactions, pp \u2192 p^(*)W^+W^\u2212p^(*), at s\u221a=7 TeV is reported using data collected by the CMS detector with an integrated luminosity of 5.05 fb^(\u22121). Events are selected by requiring a \u03bc^\u00b1e^\u2213 vertex with no additional associated charged tracks and dilepton transverse momentum p_T(\u03bc^\u00b1e^\u2213) > 30 GeV. Two events passing all selection requirements are observed in the data, compared to a standard model expectation of 2.2\u2009\u00b1\u20090.4 signal events with 0.84\u2009\u00b1\u20090.15 background. The tail of the dilepton p_T distribution is studied for deviations from the standard model. No events are observed with p_T\u2009 >\u2009100 GeV. Model-independent upper limits are computed and compared to predictions involving anomalous quartic gauge couplings. The limits on the parameters \u0251^W_(0,C)/\u039b^2 with a dipole form factor and an energy cutoff \u039b_(cutoff)\u2009=\u2009500 GeV are of the order of 10^(\u22124).", "doi": "10.1007/JHEP07(2013)116", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-07", "series_number": "7", "volume": "2013", "issue": "7", "pages": "Art. No. 116" }, { "id": "authors:wv42m-4rz58", "collection": "authors", "collection_id": "wv42m-4rz58", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131003-090314619", "type": "article", "title": "Searches for long-lived charged particles in pp collisions at\n \u221as = 7 and 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results of searches for heavy stable charged particles produced in pp collisions at s\u221a = 7 and 8 TeV are presented corresponding to an integrated luminosity of 5.0 fb^(\u22121) and 18.8 fb^(\u22121), respectively. Data collected with the CMS detector are used to study the momentum, energy deposition, and time-of-flight of signal candidates. Leptons with an electric charge between e/3 and 8e, as well as bound states that can undergo charge exchange with the detector material, are studied. Analysis results are presented for various combinations of signatures in the inner tracker only, inner tracker and muon detector, and muon detector only. Detector signatures utilized are long time-of-flight to the outer muon system and anomalously high (or low) energy deposition in the inner tracker. The data are consistent with the expected background, and upper limits are set on the production cross section of long-lived gluinos, scalar top quarks, and scalar \u03c4 leptons, as well as pair produced long-lived leptons. Corresponding lower mass limits, ranging up to 1322 GeV/c^2 for gluinos, are the most stringent to date.", "doi": "10.1007/JHEP07(2013)122", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-07", "series_number": "7", "volume": "2013", "issue": "7", "pages": "Art. No. 122" }, { "id": "authors:zkr73-k4323", "collection": "authors", "collection_id": "zkr73-k4323", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130918-103852156", "type": "article", "title": "Measurement of masses in the tt system by kinematic endpoints in pp collisions at \u221as =7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb^(\u22121) collected by the CMS experiment in pp collisions at s\u221a=7 TeV . The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of M_t=173.9\u00b10.9 (stat.)^(+1.7)_(\u22122.1) (syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.", "doi": "10.1140/epjc/s10052-013-2494-7", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2013-07", "series_number": "7", "volume": "73", "issue": "7", "pages": "Art. No. 2494" }, { "id": "authors:ssxhq-n3q67", "collection": "authors", "collection_id": "ssxhq-n3q67", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131003-112023782", "type": "article", "title": "Search for microscopic black holes in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for microscopic black holes and string balls is presented, based on a data sample of pp collisions at s\u221a=8 TeV recorded by the CMS experiment at the Large Hadron Collider and corresponding to an integrated luminosity of 12 fb^(\u22121). No excess of events with energetic multiparticle final states, typical of black hole production or of similar new physics processes, is observed. Given the agreement of the observations with the expected standard model background, which is dominated by QCD multijet production, 95% confidence level limits are set on the production of semiclassical or quantum black holes, or of string balls, corresponding to the exclusions of masses below 4.3 to 6.2 TeV, depending on model assumptions. In addition, model-independent limits are set on new physics processes resulting in energetic multiparticle final states.", "doi": "10.1007/JHEP07(2013)178", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-07", "series_number": "7", "volume": "2013", "issue": "7", "pages": "Art. No. 178" }, { "id": "authors:q9p8a-4mg12", "collection": "authors", "collection_id": "q9p8a-4mg12", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130730-082221273", "type": "article", "title": "Search for narrow resonances using the dijet mass spectrum in pp collisions at \u221as = 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented of a search for the production of new particles decaying to pairs of partons (quarks, antiquarks, or gluons), in the dijet mass spectrum in proton-proton collisions at \u221as=8\u2009\u2009TeV. The data sample corresponds to an integrated luminosity of 4.0\u2009\u2009fb^(-1), collected with the CMS detector at the LHC in 2012. No significant evidence for narrow resonance production is observed. Upper limits are set at the 95% confidence level on the production cross section of hypothetical new particles decaying to quark-quark, quark-gluon, or gluon-gluon final states. These limits are then translated into lower limits on the masses of new resonances in specific scenarios of physics beyond the standard model. The limits reach up to 4.8 TeV, depending on the model, and extend previous exclusions from similar searches performed at lower collision energies. For the first time mass limits are set for the Randall\u2013Sundrum graviton model in the dijet channel.", "doi": "10.1103/PhysRevD.87.114015", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2013-06-17", "series_number": "11", "volume": "87", "issue": "11", "pages": "Art. No. 114015" }, { "id": "authors:ab962-z6779", "collection": "authors", "collection_id": "ab962-z6779", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130919-154211949", "type": "article", "title": "Observation of a new boson with mass near 125 GeV in pp collisions at \u221as = 7 and 8 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A detailed description is reported of the analysis used by the CMS Collaboration in the search for the standard model Higgs boson in pp collisions at the LHC, which led to the observation of a new boson. The data sample corresponds to integrated luminosities up to 5.1 fb^(\u22121) at s\u221a=7 TeV, and up to 5.3 fb^(\u22121) at s\u221a=8 TeV. The results for five Higgs boson decay modes \u03b3\u03b3, ZZ, WW, \u03c4\u03c4, and bb, which show a combined local significance of 5 standard deviations near 125 GeV, are reviewed. A fit to the invariant mass of the two high resolution channels, \u03b3\u03b3 and ZZ \u2192 4\u2113, gives a mass estimate of 125.3 \u00b1 0.4 (stat.) \u00b1 0.5 (syst.) GeV. The measurements are interpreted in the context of the standard model Lagrangian for the scalar Higgs field interacting with fermions and vector bosons. The measured values of the corresponding couplings are compared to the standard model predictions. The hypothesis of custodial symmetry is tested through the measurement of the ratio of the couplings to the W and Z bosons. All the results are consistent, within their uncertainties, with the expectations for a standard model Higgs boson.", "doi": "10.1007/JHEP06(2013)081", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-06", "series_number": "6", "volume": "2013", "issue": "6", "pages": "Art. No. 81" }, { "id": "authors:45rjh-t7g03", "collection": "authors", "collection_id": "45rjh-t7g03", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130918-141225435", "type": "article", "title": "Search for a standard-model-like Higgs boson with a mass in the range 145 to 1000 GeV at the LHC", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a standard-model-like Higgs boson in the H\u2192WW and H\u2192ZZ decay channels is reported, for Higgs boson masses in the range 145", "doi": "10.1140/epjc/s10052-013-2469-8", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2013-06", "series_number": "6", "volume": "73", "issue": "6", "pages": "Art. No. 2469" }, { "id": "authors:thttj-bah50", "collection": "authors", "collection_id": "thttj-bah50", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130725-151816179", "type": "article", "title": "Search for a Higgs boson decaying into a b-quark pair and produced in association with b quarks in proton\u2013proton collisions at 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a neutral Higgs boson decaying to a pair of b quarks, and produced in association with at least one additional b quark, is presented. Multijet final states with three jets identified as originating from b quarks, at least one of which may include a non-isolated muon, are studied. The data used in this analysis correspond to an integrated luminosity of 2.7\u20134.8 fb^(\u22121), collected by the CMS experiment in proton\u2013proton collisions at the LHC at a center-of-mass energy of 7 TeV. This search is particularly sensitive to Higgs bosons in scenarios of the Minimal Supersymmetric Model (MSSM) with large values of tan \u03b2. No excess over the predicted background from standard model processes is observed. Stringent upper limits on cross section times branching fraction are derived and interpreted as bounds in the MSSM tan \u03b2 and m_A parameter-space. Observed 95% confidence level upper limits reach as low as tan\u03b2\u224818 for M_A\u2248100 GeV.", "doi": "10.1016/j.physletb.2013.04.017", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2013-05-24", "series_number": "4-5", "volume": "722", "issue": "4-5", "pages": "207-232" }, { "id": "authors:k7dwa-f2240", "collection": "authors", "collection_id": "k7dwa-f2240", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130912-113542740", "type": "article", "title": "Measurement of the tt production cross section in the\n all-jet final state in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the tt production cross section (\u03c3_(tt)) in proton-proton collisions at a centre-of-mass energy of 7 TeV, in the all-jet final state that contains at least six jets, two of which are tagged as originating from b quarks. The data correspond to an integrated luminosity of 3.54 fb^(\u22121), collected with the CMS detector at the LHC. The cross section is determined through an unbinned maximum likelihood fit of background and tt signal to the reconstructed mass spectrum of tt candidates in the data, in which events are subjected to a kinematic fit assuming a tt\u2192W^+bW^\u2212b\u21926 jets hypothesis. The measurement yields \u03c3_(tt)=139\u00b110(stat.)\u00b126(syst.)\u00b13(lum.)pb , a result consistent with those obtained in other tt decay channels, as well as with predictions of the standard model.", "doi": "10.1007/JHEP05(2013)065", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-05", "series_number": "5", "volume": "2013", "issue": "5", "pages": "Art. No. 65" }, { "id": "authors:nh5nv-mnr31", "collection": "authors", "collection_id": "nh5nv-mnr31", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130912-132335798", "type": "article", "title": "Studies of jet mass in dijet and W/Z + jet events", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Invariant mass spectra for jets reconstructed using the anti-k_T and CambridgeAachen algorithms are studied for different jet \"grooming\" techniques in data corresponding to an integrated luminosity of 5 fb^(\u22121), recorded with the CMS detector in proton-proton collisions at the LHC at a center-of-mass energy of 7 TeV. Leading-order QCD predictions for inclusive dijet and W/Z+jet production combined with parton-shower Monte Carlo models are found to agree overall with the data, and the agreement improves with the implementation of jet grooming methods used to distinguish merged jets of large transverse momentum from softer QCD gluon radiation.", "doi": "10.1007/JHEP05(2013)090", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-05", "series_number": "5", "volume": "2013", "issue": "5", "pages": "Art. No. 90" }, { "id": "authors:3e46t-9g144", "collection": "authors", "collection_id": "3e46t-9g144", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130912-153230624", "type": "article", "title": "Search for the standard model Higgs boson produced\n in association with a top-quark pair in pp collisions at\n the LHC", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "orcid": "0000-0003-2509-5731", "clpid": "Xie-Si" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the standard model Higgs boson produced in association with a top-quark pair is presented using data samples corresponding to an integrated luminosity of 5.0 fb^(\u22121) (5.1 fb^(\u22121)) collected in pp collisions at the center-of-mass energy of 7 TeV (8 TeV). Events are considered where the top-quark pair decays to either one lepton+jets (tt\u2192\u2113\u03bdqq\u2032bb) or dileptons (tt\u2192\u2113^+\u03bd\u2113^\u2212\u03bdbb), \u2113 being an electron or a muon. The search is optimized for the decay mode H\u2192bb. The largest background to the ttH signal is top-quark pair production with additional jets. Artificial neural networks are used to discriminate between signal and background events. Combining the results from the 7 TeV and 8 TeV samples, the observed (expected) limit on the cross section for Higgs boson production in association with top-quark pairs for a Higgs boson mass of 125 GeV is 5.8 (5.2) times the standard model expectation.", "doi": "10.1007/JHEP05(2013)145", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-05", "series_number": "5", "volume": "2013", "issue": "5", "pages": "Art. No. 145" }, { "id": "authors:q8q6q-dkf78", "collection": "authors", "collection_id": "q8q6q-dkf78", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130610-073951536", "type": "article", "title": "Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at \u221as=7\u2009\u2009TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0\u2009\u2009fb^(-1), recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of tt Z events and a same-sign dilepton analysis of tt\u0305 V (V=W or Z) events. In the trilepton channel a direct measurement of the tt Z cross section \u03c3_(ttZ)=0.28_(-0.11)^(+0.14)\u2009(stat)_(-0.03)^(+0.06)\u2009(syst)\u2009\u2009pb is obtained. In the dilepton channel a measurement of the tt\u0305 V cross section yields \u03c3_(ttV) =0.43_(-0.15)^(+0.17)\u2009(stat)_(-0.07)^(+0.09)\u2009(syst)\u2009\u2009pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0.137_(-0.016)^(+0.012) and 0.306_(-0.053)^(+0.031)\u2009\u2009pb.", "doi": "10.1103/PhysRevLett.110.172002", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2013-04-25", "series_number": "17", "volume": "110", "issue": "17", "pages": "Art. No. 172002" }, { "id": "authors:4s4sp-5g924", "collection": "authors", "collection_id": "4s4sp-5g924", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130509-073943760", "type": "article", "title": "Search for new physics in final states with a lepton and missing transverse energy in pp collisions at the LHC", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "This Letter describes the search for an enhanced production rate of events with a charged lepton and a neutrino in high-energy pp collisions at the LHC. The analysis uses data collected with the CMS detector, with an integrated luminosity of 5.0\u2009\u2009fb^(-1) at \u221as=7\u2009\u2009TeV, and a further 3.7\u2009\u2009fb^(-1) at \u221as=8\u2009\u2009TeV. No evidence is found for an excess. The results are interpreted in terms of limits on a heavy charged gauge boson (W\u2032) in the sequential standard model, a split universal extra dimension model, and contact interactions in the helicity-nonconserving model. For the last, values of the binding energy below 10.5 (8.8) TeV in the electron (muon) channel are excluded at a 95% confidence level. Interpreting the \u2113\u03bd final state in terms of a heavy W\u2032 with standard model couplings, masses below 2.90 TeV are excluded.", "doi": "10.1103/PhysRevD.87.072005", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2013-04-08", "series_number": "7", "volume": "87", "issue": "7", "pages": "Art. No. 072005" }, { "id": "authors:0n37v-7d673", "collection": "authors", "collection_id": "0n37v-7d673", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130516-085535367", "type": "article", "title": "Search for pair-produced dijet resonances in four-jet final states in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the pair production of a heavy, narrow resonance decaying into two jets has been performed using events collected in \u221as=7\u2009\u2009TeV pp collisions with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0\u2009\u2009fb^(-1). Events are selected with at least four jets and two dijet combinations with similar dijet mass. No resonances are found in the dijet mass spectrum. The upper limit at 95% confidence level on the product of the resonance pair production cross section, the branching fractions into dijets, and the acceptance varies from 0.22 to 0.005 pb, for resonance masses between 250 and 1200 GeV. Pair-produced colorons decaying into qq\u0305 are excluded for coloron masses between 250 and 740 GeV.", "doi": "10.1103/PhysRevLett.110.141802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2013-04-05", "series_number": "14", "volume": "110", "issue": "14", "pages": "Art. No. 141802" }, { "id": "authors:y4vg7-m0905", "collection": "authors", "collection_id": "y4vg7-m0905", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131024-092513871", "type": "article", "title": "Study of the underlying event at forward rapidity in\n pp collisions at \u221as = 0.9, 2.76, and TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The underlying event activity in proton-proton collisions at forward pseudo-rapidity (\u22126.6 < \u03b7 < \u22125.2) is studied with the CMS detector at the LHC, using a novel observable: the ratio of the forward energy density, dE/d\u03b7, for events with a charged-particle jet produced at central pseudorapidity (|\u03b7^(jet)| < 2) to the forward energy density for inclusive events. This forward energy density ratio is measured as a function of the central jet transverse momentum, p_T, at three different pp centre-of-mass energies ( s\u221a=0.9 , 2.76, and 7 TeV). In addition, the s\u221a evolution of the forward energy density is studied in inclusive events and in events with a central jet. The results are compared to those of Monte Carlo event generators for pp collisions and are discussed in terms of the underlying event. Whereas the dependence of the forward energy density ratio on jet p_T at each s\u221a separately can be well reproduced by some models, all models fail to simultaneously describe the increase of the forward energy density with s\u221a in both inclusive events and in events with a central jet.", "doi": "10.1007/JHEP04(2013)072", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-04", "series_number": "4", "volume": "2013", "issue": "4", "pages": "Art. No. 72" }, { "id": "authors:2asd1-h9376", "collection": "authors", "collection_id": "2asd1-h9376", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130910-143819498", "type": "article", "title": "Measurement of the X(3872) production cross section via decays to J/\u03c8\u03c0^+ \u03c0^\u2212 in pp collisions at s\u221a = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Xie", "given_name": "S.", "clpid": "Xie-S" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of the X(3872) is studied in pp collisions at s\u221a=7 TeV, using decays to J/\u03c8\u03c0^+ \u03c0^\u2212, where the J/\u03c8 decays to two muons. The data were recorded by the CMS experiment and correspond to an integrated luminosity of 4.8 fb^(\u22121). The measurements are performed in a kinematic range in which the X(3872) candidates have a transverse momentum 10\u2009<\u2009p_T\u2009 <\u200950 GeV and rapidity |y|\u2009<\u20091.2. The ratio of the X(3872) and \u03c8(2S) cross sections times their branching fractions into J/\u03c8\u03c0^+ \u03c0^\u2212 is measured as a function of p_T. In addition, the fraction of X(3872) originating from B decays is determined. From these measurements the prompt X(3872) differential cross section times branching fraction as a function of p_T is extracted. The \u03c0^+ \u03c0^\u2212 mass spectrum of the J/\u03c8\u03c0^+ \u03c0^\u2212 system in the X(3872) decays is also investigated.", "doi": "10.1007/JHEP04(2013)154", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2013-04", "series_number": "4", "volume": "2013", "issue": "4", "pages": "Art. No. 154" }, { "id": "authors:sxqfe-jdj84", "collection": "authors", "collection_id": "sxqfe-jdj84", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130211-074917866", "type": "article", "title": "Measurement of the elliptic anisotropy of charged particles produced in PbPb collisions at \u221as_(NN)=2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The anisotropy of the azimuthal distributions of charged particles produced in \u221as_(NN)=2.76 TeV PbPb collisions is studied with the CMS experiment at the LHC. The elliptic anisotropy parameter, v_2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method, two- and four-particle cumulants, and Lee-Yang zeros. The anisotropy is presented as a function of transverse momentum (p_T), pseudorapidity (\u03b7) over a broad kinematic range, 0.3", "doi": "10.1103/PhysRevC.87.014902", "issn": "0556-2813", "publisher": "American Physical Society", "publication": "Physical Review C", "publication_date": "2013-01-07", "series_number": "1", "volume": "87", "issue": "1", "pages": "Art. No. 014902" }, { "id": "authors:59awg-jr974", "collection": "authors", "collection_id": "59awg-jr974", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130211-100358164", "type": "article", "title": "Ratios of dijet production cross sections as a function\n of the absolute difference in rapidity between jets in proton\u2013proton collisions at s\u221a=7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A study of dijet production in proton\u2013proton collisions was performed at s\u221a=7~TeV for jets with p_T>35 GeV and |y|<4.7 using data collected with the CMS detector at the LHC in 2010. Events with at least one pair of jets are denoted as \"inclusive\". Events with exactly one pair of jets are called \"exclusive\". The ratio of the cross section of all pairwise combinations of jets to the exclusive dijet cross section as a function of the rapidity difference between jets |\u0394y| is measured for the first time up to |\u0394y|=9.2. The ratio of the cross section for the pair consisting of the most forward and the most backward jet from the inclusive sample to the exclusive dijet cross section is also presented. The predictions of the Monte Carlo event generators PYTHIA6 and PYTHIA8 agree with the measurements. In both ratios the HERWIG++ generator exhibits a more pronounced rise versus |\u0394y| than observed in the data. The BFKL-motivated generators cascade and HEJ+ARIADNE predict for these ratios a significantly stronger rise than observed.", "doi": "10.1140/epjc/s10052-012-2216-6", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2012-11", "series_number": "11", "volume": "72", "issue": "11", "pages": "Art. No. 2216" }, { "id": "authors:ksfay-p8y14", "collection": "authors", "collection_id": "ksfay-p8y14", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130110-093217088", "type": "article", "title": "Performance of CMS muon reconstruction in pp collision events at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40 pb^(\u22121) of data collected in pp collisions at \u221as = 7 TeV at the LHC in 2010. A few benchmark sets of selection criteria covering a wide range of physics analysis needs have been examined. For all considered selections, the efficiency to reconstruct and identify a muon with a transverse momentum p_T larger than a few GeV/c is above 95% over the whole region of pseudorapidity covered by the CMS muon system, |\u03b7| < 2.4, while the probability to misidentify a hadron as a muon is well below 1%. The efficiency to trigger on single muons with p_T above a few GeVc is higher than 90% over the full \u03b7 range, and typically substantially better. The overall momentum scale is measured to a precision of 0.2% with muons from Z decays. The transverse momentum resolution varies from 1% to 6% depending on pseudorapidity for muons with p_T below 100GeV/c and, using cosmic rays, it is shown to be better than 10% in the central region up to p_T = 1 TeV/c. Observed distributions of all quantities are well reproduced by the Monte Carlo simulation.", "doi": "10.1088/1748-0221/7/10/P10002", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2012-10", "series_number": "10", "volume": "7", "issue": "10", "pages": "Art. No. P10002" }, { "id": "authors:qp4ra-dn315", "collection": "authors", "collection_id": "qp4ra-dn315", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121015-102412167", "type": "article", "title": "Measurement of the Electron Charge Asymmetry in Inclusive W Production in pp Collisions \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the electron charge asymmetry in inclusive pp \u2192 W + X \u2192 e\u03bd + X production at \u221as=7\u2009\u2009TeV is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of 840\u2009\u2009pb^(-1). The electron charge asymmetry reflects the unequal production of W^+ and W^- bosons in pp collisions. The electron charge asymmetry is measured in bins of the absolute value of electron pseudorapidity in the range of |\u03b7|<2.4. The asymmetry rises from about 0.1 to 0.2 as a function of the pseudorapidity and is measured with a relative precision better than 7%. This measurement provides new stringent constraints for parton distribution functions.", "doi": "10.1103/PhysRevLett.109.111806", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2012-09-11", "series_number": "11", "volume": "109", "issue": "11", "pages": "Art. No. 111806" }, { "id": "authors:80ywp-x6r51", "collection": "authors", "collection_id": "80ywp-x6r51", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121207-093415411", "type": "article", "title": "Measurement of the underlying event in the Drell\u2013Yan process in proton\u2013proton collisions at \u221as =7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the underlying event (UE) activity in proton\u2013proton collisions at a center-of-mass energy of 7 TeV is performed using Drell\u2013Yan events in a data sample corresponding to an integrated luminosity of 2.2 fb^(\u22121), collected by the CMS experiment at the LHC. The activity measured in the muonic final state (qq \u2192 \u03bc^+\u03bc^\u2212) is corrected to the particle level and compared with the predictions of various Monte Carlo generators and hadronization models. The dependence of the UE activity on the dimuon invariant mass is well described by PYTHIA and HERWIG++ tunes derived from the leading jet/track approach, illustrating the universality of the UE activity. The UE activity is observed to be independent of the dimuon invariant mass in the region above 40 GeV/c^2, while a slow increase is observed with increasing transverse momentum of the dimuon system. The dependence of the UE activity on the transverse momentum of the dimuon system is accurately described by madgraph, which simulates multiple hard emissions.", "doi": "10.1140/epjc/s10052-012-2080-4", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2012-09", "series_number": "9", "volume": "72", "issue": "9", "pages": "Art. No. 2080" }, { "id": "authors:2s2pt-fsj33", "collection": "authors", "collection_id": "2s2pt-fsj33", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121018-090208359", "type": "article", "title": "Study of W boson production in PbPb and pp collisions at\n \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of W-boson production in PbPb collisions carried out at a nucleon\u2013nucleon (NN) centre-of-mass energy \u221asNN of 2.76 TeV at the LHC using the CMS detector. In data corresponding to an integrated luminosity of 7.3 \u03bcb^(\u22121), the number of W \u2192 \u03bc\u03bd_\u03bc decays is extracted in the region of muon pseudorapidity |\u03b7^\u03bc| < 2.1 and transverse momentum P_T^\u00b5 > 25GeV/c. Yields of muons found per unit of pseudorapidity correspond to (159\u00b110(stat.)\u00b112(syst.))\u00d710^(\u22128)W^+ and (154\u00b110(stat.)\u00b112(syst.))\u00d710^(\u22128)W^\u2212 bosons per minimum-bias PbPb collision. The dependence of W production on the centrality of PbPb collisions is consistent with a scaling of the yield by the number of incoherent NN collisions. The yield of W bosons is also studied in a sample of pp interactions at \u221as = 2.76 TeV corresponding to an integrated luminosity of 231 nb^(\u22121). The individual W^+ and W^\u2212 yields in PbPb and pp collisions are found to agree, once the neutron and proton content in Pb nuclei is taken into account. Likewise, the difference observed in the dependence of the positive and negative muon production on pseudorapidity is consistent with next-to-leading-order perturbative QCD calculations.", "doi": "10.1016/j.physletb.2012.07.025", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-08-29", "series_number": "1-3", "volume": "715", "issue": "1-3", "pages": "66-87" }, { "id": "authors:0g14z-f2f74", "collection": "authors", "collection_id": "0g14z-f2f74", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120927-120246991", "type": "article", "title": "Search for New Physics with Same-Sign Isolated Dilepton Events with Jets and Missing Transverse Energy", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics is performed in events with two same-sign isolated leptons, hadronic jets, and missing transverse energy in the final state. The analysis is based on a data sample corresponding to an integrated luminosity of 4.98\u2009\u2009fb^(-1) produced in pp collisions at a center-of-mass energy of 7 TeV collected by the CMS experiment at the LHC. This constitutes a factor of 140 increase in integrated luminosity over previously published results. The observed yields agree with the standard model predictions and thus no evidence for new physics is found. The observations are used to set upper limits on possible new physics contributions and to constrain supersymmetric models. To facilitate the interpretation of the data in a broader range of new physics scenarios, information on the event selection, detector response, and efficiencies is provided.", "doi": "10.1103/PhysRevLett.109.071803", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2012-08-17", "series_number": "7", "volume": "109", "issue": "7", "pages": "Art. No. 071803" }, { "id": "authors:kvzsa-1ak59", "collection": "authors", "collection_id": "kvzsa-1ak59", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121207-134332016", "type": "article", "title": "Search for leptonic decays of W' bosons in pp collisions at\n \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a new heavy gauge boson W\u2032 decaying to an electron or muon, plus a low mass neutrino, is presented. This study uses data corresponding to an integrated luminosity of 5.0 fb^(\u22121), collected using the CMS detector in pp collisions at a centre-of-mass energy of 7 TeV at the LHC. Events containing a single electron or muon and missing transverse momentum are analyzed. No significant excess of events above the standard model expectation is found in the transverse mass distribution of the lepton-neutrino system, and upper limits for cross sections above different transverse mass thresholds are presented. Mass exclusion limits at 95% CL for a range of W\u2032 models are determined, including a limit of 2.5 TeV for right-handed W\u2032 bosons with standard-model-like couplings and limits of 2.43\u20132.63 TeV for left-handed W\u2032 bosons, taking into account their interference with the standard model W boson. Exclusion limits have also been set on Kaluza-Klein WKK states in the framework of split universal extra dimensions.", "doi": "10.1007/JHEP08(2012)023", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-08", "series_number": "8", "volume": "2012", "issue": "8", "pages": "Art. No. 23" }, { "id": "authors:s3tpj-x2y64", "collection": "authors", "collection_id": "s3tpj-x2y64", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121207-115323200", "type": "article", "title": "Search for stopped long-lived particles produced in pp\n collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search has been performed for long-lived particles that have stopped in the CMS detector, during 7TeV proton-proton operations of the CERN LHC. The existence of such particles could be inferred from observation of their decays when there were no protonproton collisions in the CMS detector, namely during gaps between LHC beam crossings. Using a data set in which CMS recorded an integrated luminosity of 4.0 fb^(-1), and a search interval corresponding to 246 hours of trigger live time, 12 events are observed, with a mean\nbackground prediction of 8.6 \u00b1 2.4 events. Limits are presented at 95% confidence level on long-lived gluino and stop production, over 13 orders of magnitude of particle lifetime. Assuming the \"cloud model\" of R-hadron interactions, a gluino with mass below 640 GeV and a stop with mass below 340 GeV are excluded, for lifetimes between 10 \u00b5s and 1000s.", "doi": "10.1007/JHEP08(2012)026", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-08", "series_number": "8", "volume": "2012", "issue": "8", "pages": "Art. No. 26" }, { "id": "authors:m58n0-33711", "collection": "authors", "collection_id": "m58n0-33711", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120906-092806771", "type": "article", "title": "Search for heavy long-lived charged particles in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The result of a search for heavy long-lived charged particles produced in pp collisions at \u221as = 7 TeV source at the LHC is described. The data sample has been collected using the CMS detector and corresponds to an integrated luminosity of 5.0 fb^(\u22121). The inner tracking detectors are used to define a sample of events containing tracks with high momentum and high ionization energy loss. A second sample of events, which have high-momentum tracks satisfying muon identification requirements in addition to meeting high-ionization and long time-of-flight requirements, is analyzed independently. In both cases, the results are consistent with the expected background estimated from data. The results are used to establish cross section limits as a function of mass within the context of models with long-lived gluinos, scalar top quarks and scalar taus. Cross section limits on hyper-meson particles, containing new elementary long-lived hyper-quarks predicted by a vector-like confinement model, are also presented. Lower limits at 95% confidence level on the mass of gluinos (scalar top quarks) are found to be 1098 (737) GeV/c^2. A limit of 928 (626) GeV/c^2 is set for a gluino (scalar top quark) that hadronizes into a neutral bound state before reaching the muon detectors. The lower mass limit for a pair produced scalar tau is found to be 223 GeV/c^2. Mass limits for a hyper-kaon are placed at 484, 602, and 747 GeV/c^2 for hyper-\u03c1 masses of 800, 1200, and 1600 GeV/c^2, respectively.", "doi": "10.1016/j.physletb.2012.06.023", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-07-18", "series_number": "4-5", "volume": "713", "issue": "4-5", "pages": "408-433" }, { "id": "authors:6ygpx-4jt18", "collection": "authors", "collection_id": "6ygpx-4jt18", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120810-093810596", "type": "article", "title": "Azimuthal Anisotropy of Charged Particles at High Transverse Momenta in Pb-Pb Collisions at \u221as_(NN) = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The azimuthal anisotropy of charged particles in Pb-Pb collisions at \u221as_(NN)=2.76\u2009\u2009TeV is measured with the CMS detector at the LHC over an extended transverse momentum (p_T) range up to approximately 60\u2009\u2009GeV/c. The data cover both the low-p_T region associated with hydrodynamic flow phenomena and the high-p_T region where the anisotropies may reflect the path-length dependence of parton energy loss in the created medium. The anisotropy parameter (v_2) of the particles is extracted by correlating charged tracks with respect to the event-plane reconstructed by using the energy deposited in forward-angle calorimeters. For the six bins of collision centrality studied, spanning the range of 0\u201360% most-central events, the observed v_2 values are found to first increase with pT, reaching a maximum around p_T=3\u2009\u2009GeV/c, and then to gradually decrease to almost zero, with the decline persisting up to at least p_T=40\u2009\u2009GeV/c over the full centrality range measured.", "doi": "10.1103/PhysRevLett.109.022301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2012-07-10", "series_number": "2", "volume": "109", "issue": "2", "pages": "Art. No. 022301" }, { "id": "authors:j470t-qdc30", "collection": "authors", "collection_id": "j470t-qdc30", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121015-075548348", "type": "article", "title": "Search for a light charged Higgs boson in top quark decays in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented on a search for a light charged Higgs boson that can be produced in the decay of the top quark t\u2009\u2192\u2009H^+b and which, in turn, decays into \u03c4^+\u03bd_\u03c4. The analysed data correspond to an integrated luminosity of about 2 fb^(\u22121) recorded in protonproton collisions at \u221as = 7TeV by the CMS experiment at the LHC. The search is sensitive to the decays of the top quark pairs tt \u2192 H^\u00b1 W^\u2213 bb and tt \u2192 H^\u00b1H^\u2213 bb. Various final states have been studied separately, all requiring presence of a \u03c4 lepton from H^+ decays, missing transverse energy, and multiple jets. Upper limits on the branching fraction B(t \u2192 H^+b) in the range of 2-4 % are established for charged Higgs boson masses between 80 and 160 GeV, under the assumption that B(H^+ \u2192 \u03c4 ^+\u03bd_\u03c4) = 1.", "doi": "10.1007/JHEP07(2012)143", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-07", "series_number": "7", "volume": "2012", "issue": "7", "pages": "Art. No. 143" }, { "id": "authors:grd5v-32j31", "collection": "authors", "collection_id": "grd5v-32j31", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120723-101739990", "type": "article", "title": "Search for Dark Matter and Large Extra Dimensions in pp Collisions Yielding a Photon and Missing Transverse Energy", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for new physics in the final state containing a photon (\u03b3) and missing transverse energy (E\u0338_T). The data correspond to an integrated luminosity of 5.0\u2009\u2009fb^(-1) collected in pp collisions at \u221as=7\u2009\u2009TeV by the CMS experiment. The observed event yield agrees with standard-model expectations for the \u03b3+E\u0338_T events. Using models for the production of dark-matter particles (\u03c7), we set 90% confidence level (C.L.) upper limits of 13.6\u201315.4 fb on \u03c7 production in the \u03b3+E\u0338_T state. These provide the most sensitive upper limits for spin-dependent \u03c7-nucleon scattering for \u03c7 masses (M_\u03c7) between 1 and 100 GeV. For spin-independent contributions, the present limits are extended to M_\u03c7<3.5\u2009\u2009GeV. For models with 3\u20136 large extra dimensions, our data exclude extra-dimensional Planck scales between 1.64 and 1.73 TeV at 95% C.L.", "doi": "10.1103/PhysRevLett.108.261803", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2012-06-29", "series_number": "26", "volume": "108", "issue": "26", "pages": "Art. No. 261803" }, { "id": "authors:4g7jy-mhs81", "collection": "authors", "collection_id": "4g7jy-mhs81", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120927-115107967", "type": "article", "title": "Observation of a New \u039e_b Baryon", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The observation of a new b baryon via its strong decay into \u039e_b^-\u03c0^+ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at \u221as=7\u2009\u2009TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3\u2009\u2009fb^(-1). The known \u039eb- baryon is reconstructed via the decay chain \u039e_b^-\u2192J/\u03c8\u039e^-\u2192\u03bc^+\u03bc^-\u039b^0\u03c0^-, with \u039b^0\u2192p\u03c0^-. A peak is observed in the distribution of the difference between the mass of the \u039e^b^-\u03c0^+ system and the sum of the masses of the \u039e_b^- and \u03c0^+, with a significance exceeding 5 standard deviations. The mass difference of the peak is 14.84\u00b10.74(stat)\u00b10.28(syst)\u2009\u2009MeV. The new state most likely corresponds to the J^P=3/2^+ companion of the \u039e_b.", "doi": "10.1103/PhysRevLett.108.252002", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2012-06-22", "series_number": "25", "volume": "108", "issue": "25", "pages": "Art. No. 252002" }, { "id": "authors:ba4na-yc435", "collection": "authors", "collection_id": "ba4na-yc435", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120720-134238297", "type": "article", "title": "Search for neutral Higgs bosons decaying to tau pairs in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for neutral Higgs bosons decaying to tau pairs at a center-of-mass energy of 7 TeV is performed using a dataset corresponding to an integrated luminosity of 4.6 fb^(\u22121) recorded by the CMS experiment at the LHC. The search is sensitive to both the standard model Higgs boson and to the neutral Higgs bosons predicted by the minimal supersymmetric extension of the standard model (MSSM). No excess of events is observed in the tau-pair invariant-mass spectrum. For a standard model Higgs boson in the mass range of 110\u2013145 GeV upper limits at 95% confidence level (CL) on the production cross section are determined. We exclude a Higgs boson with m_H=115 GeV with a production cross section 3.2 times of that predicted by the standard model. In the MSSM, upper limits on the neutral Higgs boson production cross section times branching fraction to tau pairs, as a function of the pseudoscalar Higgs boson mass, m_A, sets stringent new bounds in the parameter space, excluding at 95% CL values of tan \u03b2 as low as 7.1 at m_A=160 GeV in the m^(max)_h benchmark scenario.", "doi": "10.1016/j.physletb.2012.05.028", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-06-21", "series_number": "2", "volume": "713", "issue": "2", "pages": "68-90" }, { "id": "authors:mee8n-fm946", "collection": "authors", "collection_id": "mee8n-fm946", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120717-074924424", "type": "article", "title": "Jet momentum dependence of jet quenching in PbPb collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Dijet production in PbPb collisions at a nucleon\u2013nucleon center-of-mass energy of 2.76 TeV is studied with the CMS detector at the LHC. A data sample corresponding to an integrated luminosity of 150 \u03bcb^(\u22121) is analyzed. Jets are reconstructed using combined information from tracking and calorimetry, using the anti-k_T algorithm with R=0.3. The dijet momentum balance and angular correlations are studied as a function of collision centrality and leading jet transverse momentum. For the most peripheral PbPb collisions, good agreement of the dijet momentum balance distributions with pp data and reference calculations at the same collision energy is found, while more central collisions show a strong imbalance of leading and subleading jet transverse momenta attributed to the jet-quenching effect. The dijets in central collisions are found to be more unbalanced than the reference, for leading jet transverse momenta up to the highest values studied.", "doi": "10.1016/j.physletb.2012.04.058", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-06-06", "series_number": "3", "volume": "712", "issue": "3", "pages": "176-197" }, { "id": "authors:35jw6-6w141", "collection": "authors", "collection_id": "35jw6-6w141", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121026-130645196", "type": "article", "title": "Shape, transverse size, and charged-hadron multiplicity of jets in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of jet characteristics from inclusive jet production in protonproton collisions at a centre-of-mass energy of 7 TeV are presented. The data sample was collected with the CMS detector at the LHC during 2010 and corresponds to an integrated luminosity of 36 pb^(\u22121). The mean charged-hadron multiplicity, the differential and integral jet shape distributions, and two independent moments of the shape distributions are measured as functions of the jet transverse momentum for jets reconstructed with the anti-k_T algorithm. The measured observables are corrected to the particle level and compared with predictions from various QCD Monte Carlo generators.", "doi": "10.1007/JHEP06(2012)160", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-06", "series_number": "6", "volume": "2012", "issue": "6", "pages": "Art. No. 160" }, { "id": "authors:tg6yt-ng281", "collection": "authors", "collection_id": "tg6yt-ng281", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121026-094717028", "type": "article", "title": "Measurement of the cross section for production of\n bbX decaying to muons in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the inclusive cross section for the process pp \u2192 bbX \u2192 \u03bc\u03bcX\u2032 at \u221as=7 TeV is presented, based on a data sample corresponding to an integrated luminosity of 27.9 pb^(\u22121) collected by the CMS experiment at the LHC. By selecting pairs of muons each with pseudorapidity |\u03b7| < 2.1, the value \u03c3(pp \u2192 bbX \u2192 \u03bc\u03bcX\u2032) = 26.4 \u00b1 0.1 (stat.) \u00b12.4 (syst.) \u00b11.1 (lumi.) nb is obtained for muons with transverse momentum p_T > 4 GeV, and 5.12 \u00b1 0.03 (stat.) \u00b1 0.48 (syst.) \u00b1 0.20 (lumi.) nb for p_T > 6 GeV. These results are compared to QCD predictions at leading and next-to-leading orders.", "doi": "10.1007/JHEP06(2012)110", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-06", "series_number": "6", "volume": "2012", "issue": "6", "pages": "Art. No. 110" }, { "id": "authors:w23vf-s3n63", "collection": "authors", "collection_id": "w23vf-s3n63", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121026-141924867", "type": "article", "title": "Search for anomalous production of multilepton events in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for anomalous production of events with three or more isolated leptons in pp collisions at \u221as=7TeV is presented. The data, corresponding to an integrated luminosity of 4.98 fb^(\u22121), were collected by the CMS experiment at the LHC during the 2011 run. The search is applicable to any model of new physics that enhances multiple lepton production. The observed multilepton events are categorized into exclusive search channels based on the identity and kinematics of the objects in the events. An estimate of the standard-model background rates from data is emphasized, but simulation is also used to estimate some of the background rates. The search results are interpreted in the context of supersymmetry, including both R-parity-conserving and R-parity-violating models. We derive exclusion limits as a function of squark, gluino, and chargino masses.", "doi": "10.1007/JHEP06(2012)169", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-06", "series_number": "6", "volume": "2012", "issue": "6", "pages": "Art. No. 169" }, { "id": "authors:bk7g7-cp767", "collection": "authors", "collection_id": "bk7g7-cp767", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120927-114913429", "type": "article", "title": "Measurement of the inclusive production cross sections for forward jets and for dijet events with one forward and one central jet in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The inclusive production cross sections for forward jets, as well for jets in dijet events with at least one jet emitted at central and the other at forward pseudorapidities, are measured in the range of transverse momenta p_T\u2009=\u200935-150 GeV/c in proton-proton collisions at \u221as=7 TeV by the CMS experiment at the LHC. Forward jets are measured within pseudorapidities 3.2\u2009<\u2009|\u03b7|\u2009<\u20094.7, and central jets within the |\u03b7|\u2009<\u20092.8 range. The differential cross sections d^2\u03c3/dp_T d\u03b7 are compared to predictions from three approaches in perturbative quantum chromodynamics: (i) next-to-leading-order calculations obtained with and without matching to parton-shower Monte Carlo simulations, (ii) PYTHIA and HERWIG parton-shower event generators with different tunes of parameters, and (iii) CASCADE and HEJ models, including different non-collinear corrections to standard single-parton radiation. The single-jet inclusive forward jet spectrum is well described by all models, but not all predictions are consistent with the spectra observed for the forward-central dijet events.", "doi": "10.1007/JHEP06(2012)036", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-06", "series_number": "6", "volume": "2012", "issue": "6", "pages": "Art. No. 36" }, { "id": "authors:peypq-szj77", "collection": "authors", "collection_id": "peypq-szj77", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121026-092233507", "type": "article", "title": "Measurement of the mass difference between top and antitop quarks", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the mass difference between the top and the antitop quark (\u0394m_t = m_t \u2212 m_t^-) is performed using events with a muon or an electron and at least four jets in the final state. The analysis is based on data collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.96\u00b10.11 fb^(\u22121), and yields the value of \u0394m_t = \u22120.44\u00b10.46 (stat.)\u00b10.27 (syst.) GeV. This result is consistent with equality of particle and antiparticle masses required by CPT invariance, and provides a significantly improved precision relative to existing measurements.", "doi": "10.1007/JHEP06(2012)109", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-06", "series_number": "6", "volume": "2012", "issue": "6", "pages": "Art. No. 109" }, { "id": "authors:zv5ra-29017", "collection": "authors", "collection_id": "zv5ra-29017", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121026-105656460", "type": "article", "title": "Measurement of the Z/y^*+b-jet cross section in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of b jets in association with a Z/y^* boson is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7TeV and recorded by the CMS detector. The inclusive cross section for Z/y^*+b-jet production is measured in a sample corresponding to an integrated luminosity of 2.2 fb^(-1). The Z/y^*+b-jet cross section with Z/y^* \u2192 \u2113\u2113(where \u2113\u2113 = ee or \u00b5\u00b5 ) for events with the invariant mass 60 < M_(\u2113\u2113) < 120 GeV, at least one b jet at the hadron level with p_T > 25 GeV and \u2502\u03b7\u2502 < 2.1, and a separation between the leptons and the jets of \u0394R > 0.5 is found to be 5.84\u00b10.08 (stat:)\u00b10.72 (syst:)^(+0.25)_(-0.55) (theory) pb. The kinematic properties of the events are also studied and found to be in agreement with the predictions made by the MADGRAPH event generator with the parton shower and the hadronisation performed by PYTHIA.", "doi": "10.1007/JHEP06(2012)126", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-06", "series_number": "6", "volume": "2012", "issue": "6", "pages": "Art. No. 126" }, { "id": "authors:bh6re-d0427", "collection": "authors", "collection_id": "bh6re-d0427", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120723-093944165", "type": "article", "title": "Measurement of the tt production cross section in pp collisions at \u221as = 7 TeV in dilepton final states containing a \u03c4", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The top quark pair production cross section is measured in dilepton events with one electron or muon, and one hadronically decaying \u03c4 lepton from the decay tt \u2192(\u2113\u03bd_\u2113)(\u03c4_h\u03bd_\u03c4)bb, (\u2113=e,\u03bc). The data sample corresponds to an integrated luminosity of 2.0\u2009\u2009fb^(-1) for the electron channel and 2.2\u2009\u2009fb^(-1) for the muon channel, collected by the CMS detector at the LHC. This is the first measurement of the tt cross section explicitly including \u03c4 leptons in proton-proton collisions at \u221as=7\u2009\u2009TeV. The measured value \u03c3_(tt) =143\u00b114(stat)\u00b122(syst)\u00b13(lumi)\u2009\u2009pb is consistent with the standard model predictions.", "doi": "10.1103/PhysRevD.85.112007", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2012-06", "series_number": "11", "volume": "85", "issue": "11", "pages": "Art. No. 112007" }, { "id": "authors:ra7y8-dsx91", "collection": "authors", "collection_id": "ra7y8-dsx91", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120810-115644487", "type": "article", "title": "Suppression of non-prompt J/\u03c8, prompt J/\u03c8, and Y(1S) in PbPb collisions at \u221as_(NN) = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Yields of prompt and non-prompt J/\u03c8, as well as ^Y(1S) mesons, are measured by the CMS experiment via their \u03bc^+\u03bc^\u2212 decays in PbPb and pp collisions at \u221as_(NN)=276 TeV for quarkonium rapidity |y| < 2.4. Differential cross sections and nuclear modification factors are reported as functions of y and transverse momentum p_T, as well as collision centrality. For prompt J/\u03c8 with relatively high p_T (6.5 < p_T < 30 GeV/c), a strong, centrality-dependent suppression is observed in PbPb collisions, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions. In the same kinematic range, a suppression of non-prompt J/\u03c8, which is sensitive to the in-medium b-quark energy loss, is measured for the first time. Also the low-p_T ^Y(1S) mesons are suppressed in PbPb collisions.", "doi": "10.1007/JHEP05(2012)063", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-05", "series_number": "5", "volume": "2012", "issue": "5", "pages": "Art. No. 63" }, { "id": "authors:3jfbe-t6192", "collection": "authors", "collection_id": "3jfbe-t6192", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120710-094822448", "type": "article", "title": "Centrality dependence of dihadron correlations and azimuthal\n anisotropy harmonics in PbPb collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements from the CMS experiment at the LHC of dihadron correlations for charged particles produced in PbPb collisions at a nucleon\u2013nucleon centre-of-mass energy of 2.76 TeV are presented. The results are reported as a function of the particle transverse momenta (p_T) and collision centrality over a broad range in relative pseudorapidity (\u0394\u03b7) and the full range of relative azimuthal angle (\u0394\u03d5). The observed two-dimensional correlation structure in \u0394\u03b7 and \u0394\u03d5 is characterised by a narrow peak at (\u0394\u03b7,\u0394\u03d5)\u2248(0,0) from jet-like correlations and a long-range structure that persists up to at least |\u0394\u03b7|=4. An enhancement of the magnitude of the short-range jet peak is observed with increasing centrality, especially for particles of p_T around 1\u20132 GeV/c. The long-range azimuthal dihadron correlations are extensively studied using a Fourier decomposition analysis. The extracted Fourier coefficients are found to factorise into a product of single-particle azimuthal anisotropies up to p_T\u22483\u20133.5 GeV/c for at least one particle from each pair, except for the second-order harmonics in the most central PbPb events. Various orders of the single-particle azimuthal anisotropy harmonics are extracted for associated particle p_T of 1\u20133 GeV/c, as a function of the trigger particle p_T up to 20 GeV/c and over the full centrality range.", "doi": "10.1140/epjc/s10052-012-2012-3", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2012-05", "series_number": "5", "volume": "72", "issue": "5", "pages": "Art. No. 2012" }, { "id": "authors:fkrc8-fbe06", "collection": "authors", "collection_id": "fkrc8-fbe06", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120810-103431197", "type": "article", "title": "Search for quark compositeness in dijet angular\n distributions from pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for quark compositeness using dijet angular distributions from pp collisions at \u221as = 7 TeV is presented. The search has been carried out using a data sample corresponding to an integrated luminosity of 2.2 fb^(\u22121), recorded by the CMS experiment at the LHC. Normalized dijet angular distributions have been measured for dijet invariant masses from 0.4 TeV to above 3 TeV and compared with a variety of contact interaction models, including those which take into account the effects of next-to-leading-order QCD corrections. The data are found to be in agreement with the predictions of perturbative QCD, and lower limits are obtained on the contact interaction scale, ranging from 7.5 up to 14.5 TeV at 95 % confidence level.", "doi": "10.1007/JHEP05(2012)055", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-05", "series_number": "5", "volume": "2012", "issue": "5", "pages": "Art. No. 55" }, { "id": "authors:q79aa-5a748", "collection": "authors", "collection_id": "q79aa-5a748", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120730-111805685", "type": "article", "title": "Search for heavy bottom-like quarks in 4.9 fb^(-1) of pp\n collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are presented from a search for heavy bottom-like quarks, pair-produced in pp collisions at \u221as=7 TeV, undertaken with the CMS experiment at the LHC. The b\u2032 quarks are assumed to decay exclusively to tW. The b'b' \u2192 tW^\u2212tW^+ process can be identified by its distinctive signatures of three leptons or two leptons of same charge, and at least one b-quark jet. Using a data sample corresponding to an integrated luminosity of 4.9 fb^(\u22121), observed events are compared to the standard model background predictions, and the existence of b\u2032 quarks having masses below 611 GeV/c^2 is excluded at 95% confidence level.", "doi": "10.1007/JHEP05(2012)123", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-05", "series_number": "5", "volume": "2012", "issue": "5", "pages": "Art. No. 123" }, { "id": "authors:9jbz9-sza87", "collection": "authors", "collection_id": "9jbz9-sza87", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120529-110252125", "type": "article", "title": "Search for the standard model Higgs boson decaying into two photons in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a center-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 fb^(\u22121). Limits are set on the cross section of the standard model Higgs boson decaying to two photons. The expected exclusion limit at 95% confidence level is between 1.4 and 2.4 times the standard model cross section in the mass range between 110 and 150 GeV. The analysis of the data excludes, at 95% confidence level, the standard model Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The largest excess of events above the expected standard model background is observed for a Higgs boson mass hypothesis of 124 GeV with a local significance of 3.1\u03c3. The global significance of observing an excess with a local significance \u2a7e3.1\u03c3 anywhere in the search range 110\u2013150 GeV is estimated to be 1.8\u03c3. More data are required to ascertain the origin of this excess.", "doi": "10.1016/j.physletb.2012.03.003", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-04-12", "series_number": "3", "volume": "710", "issue": "3", "pages": "403-425" }, { "id": "authors:azswp-xrx28", "collection": "authors", "collection_id": "azswp-xrx28", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120529-132601996", "type": "article", "title": "Measurement of isolated photon production in pp and PbPb collisions at \u221asnn = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Isolated photon production is measured in proton\u2013proton and lead\u2013lead collisions at nucleon\u2013nucleon centre-of-mass energies of 2.76 TeV in the pseudorapidity range |\u03b7|<1.44 and transverse energies E_T between 20 and 80 GeV with the CMS detector at the LHC. The measured E_T spectra are found to be in good agreement with next-to-leading-order perturbative QCD predictions. The ratio of PbPb to pp isolated photon E_T-differential yields, scaled by the number of incoherent nucleon\u2013nucleon collisions, is consistent with unity for all PbPb reaction centralities.", "doi": "10.1016/j.physletb.2012.02.077", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-04-04", "series_number": "2", "volume": "710", "issue": "2", "pages": "256-277" }, { "id": "authors:knrq1-nnn30", "collection": "authors", "collection_id": "knrq1-nnn30", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120529-112905547", "type": "article", "title": "Search for the standard model Higgs boson decaying to bottom quarks in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the standard model Higgs boson (H) decaying to bb when produced in association with weak vector bosons (V) is reported for the following modes: W(\u03bc\u03bd)H, W(e\u03bd)H, Z(\u03bc\u03bc)H, Z(ee)H and Z(\u03bd\u03bd)H. The search is performed in a data sample corresponding to an integrated luminosity of 4.7 fb^(\u22121), recorded by the CMS detector in proton\u2013proton collisions at the LHC with a center-of-mass energy of 7 TeV. No significant excess of events above the expectation from background is observed. Upper limits on the VH production cross section times the H \u2192 bb branching ratio, with respect to the expectations for a standard model Higgs boson, are derived for a Higgs boson in the mass range 110\u2013135 GeV. In this range, the observed 95% confidence level upper limits vary from 3.4 to 7.5 times the standard model prediction; the corresponding expected limits vary from 2.7 to 6.7 times the standard model prediction.", "doi": "10.1016/j.physletb.2012.02.085", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-04-04", "series_number": "2", "volume": "710", "issue": "2", "pages": "284-306" }, { "id": "authors:60p1h-eh435", "collection": "authors", "collection_id": "60p1h-eh435", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120705-083113580", "type": "article", "title": "Inclusive b-jet production in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "The inclusive b-jet production cross section in pp collisions at a center-of mass energy of 7 TeV is measured using data collected by the CMS experiment at the LHC. The cross section is presented as a function of the jet transverse momentum in the range 18\u2009<\u2009p_T\u2009 <\u2009200 GeV for several rapidity intervals. The results are also given as the ratio of the b-jet production cross section to the inclusive jet production cross section. The measurement is performed with two different analyses, which differ in their trigger selection and b-jet identification: a jet analysis that selects events with a b jet using a sample corresponding to an integrated luminosity of 34 pb^(\u22121), and a muon analysis requiring a b jet with a muon based on an integrated luminosity of 3 pb^(\u22121). In both approaches the b jets are identified by requiring a secondary vertex. The results from the two methods are in agreement with each other and with next-to-leading order calculations, as well as with predictions based on the pythia event generator.", "doi": "10.1007/JHEP04(2012)084", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-04", "series_number": "4", "volume": "2012", "issue": "4", "pages": "Art. No. 084" }, { "id": "authors:jw3vb-0v983", "collection": "authors", "collection_id": "jw3vb-0v983", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120705-095807489", "type": "article", "title": "Search for B^0_s \u2192 \u00b5^+\u00b5^- and B^0 \u2192 \u00b5^+\u00b5^- decays", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the rare decays B^0_s \u2192 \u03bc^+\u03bc^\u2212 and B^0 \u2192 \u03bc^+\u03bc^\u2212 is performed in pp collisions at \u221as = 7TeV , with a data sample corresponding to an integrated luminosity of 5 fb^(\u22121) collected by the CMS experiment at the LHC. In both decays, the number of events observed after all selection requirements is consistent with the expectation from background plus standard model signal predictions. The resulting upper limits on the branching fractions are B(B^0_s \u2192 \u00b5^+\u00b5^\u22127.7x10^(\u22129) and B(B^0 \u2192 \u00b5^+\u00b5^\u2212) 1.8x10^(\u22129) at 95% confidence level.", "doi": "10.1007/JHEP04(2012)033", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-04", "series_number": "4", "volume": "2012", "issue": "4", "pages": "Art. No. 033" }, { "id": "authors:rqjtf-my703", "collection": "authors", "collection_id": "rqjtf-my703", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120706-072839965", "type": "article", "title": "Search for a Higgs boson in the decay channel\n H \u2192 ZZ^(*) \u2192 qq\u2113^-\u2113^+ in pp collisions at \u221as = 7TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the standard model Higgs boson decaying into two Z bosons with subsequent decay into a final state containing two quark jets and two leptons, H \u2192 ZZ^(*) \u2192 qq\u2113^\u2212\u2113^+ is presented. Results are based on data corresponding to an integrated luminosity of 4.6 fb^(\u22121) of proton-proton collisions at \u221as=7 TeV, collected with the CMS detector at the LHC. In order to discriminate between signal and background events, kinematic and topological quantities, including the angular spin correlations of the decay products, are employed. Events are further classified according to the probability of the jets to originate from quarks of light or heavy flavor or from gluons. No evidence for the Higgs boson is found, and upper limits on its production cross section are determined for a Higgs boson of mass between 130 and 600 GeV.", "doi": "10.1007/JHEP04(2012)036", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-04", "series_number": "4", "volume": "2012", "issue": "4", "pages": "Art. No. 036" }, { "id": "authors:nwtkx-n8r07", "collection": "authors", "collection_id": "nwtkx-n8r07", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120706-070330856", "type": "article", "title": "Search for microscopic black holes in pp collisions at\n \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "clpid": "Chen-Y" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for microscopic black holes in pp collisions at a center-of-mass energy of 7 TeV is presented. The data sample corresponds to an integrated luminosity of 4.7 fb^(\u22121) recorded by the CMS experiment at the LHC in 2011. Events with large total transverse energy have been analyzed for the presence of multiple energetic jets, leptons, and photons, which are typical signals of evaporating semiclassical and quantum black holes, and string balls. Agreement with the expected standard model backgrounds, which are dominated by QCD multijet production, has been observed for various combined multiplicities of jets and other reconstructed objects in the final state. Model-independent limits are set on new physics processes producing high-multiplicity, energetic final states. In addition, new model-specific indicative limits are set excluding semiclassical and quantum black holes with masses below 3.8 to 5.3 TeV and string balls with masses below 4.6 to 4.8 TeV . The analysis has a substantially increased sensitivity compared to previous searches.", "doi": "10.1007/JHEP04(2012)061", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-04", "series_number": "4", "volume": "2012", "issue": "4", "pages": "Art. No. 061" }, { "id": "authors:2ey4s-nqp89", "collection": "authors", "collection_id": "2ey4s-nqp89", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120619-094801378", "type": "article", "title": "Search for the standard model Higgs boson decaying to W^+W^\u2212 in the fully leptonic final state in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the standard model Higgs boson decaying to W^+W^\u2212 in pp collisions at \u221as=7 TeV is reported. The data are collected at the LHC with the CMS detector, and correspond to an integrated luminosity of 4.6 fb^(\u22121). The W^+W^\u2212 candidates are selected in events with two charged leptons and large missing transverse energy. No significant excess of events above the standard model background expectations is observed, and upper limits on the Higgs boson production relative to the standard model Higgs expectation are derived. The standard model Higgs boson is excluded in the mass range 129\u2013270 GeV at 95% confidence level.", "doi": "10.1016/j.physletb.2012.02.076", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-03-29", "series_number": "1", "volume": "710", "issue": "1", "pages": "91-113" }, { "id": "authors:sv5mm-yxg38", "collection": "authors", "collection_id": "sv5mm-yxg38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120619-103420799", "type": "article", "title": "Combined results of searches for the standard model Higgs boson in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Combined results are reported from searches for the standard model Higgs boson in proton\u2013proton collisions at \u221as=7 TeV in five Higgs boson decay modes: \u03b3\u03b3, bb, \u03c4\u03c4, WW, and ZZ. The explored Higgs boson mass range is 110\u2013600 GeV. The analysed data correspond to an integrated luminosity of 4.6\u20134.8 fb^(\u22121). The expected excluded mass range in the absence of the standard model Higgs boson is 118\u2013543 GeV at 95% CL. The observed results exclude the standard model Higgs boson in the mass range 127\u2013600 GeV at 95% CL, and in the mass range 129\u2013525 GeV at 99% CL. An excess of events above the expected standard model background is observed at the low end of the explored mass range making the observed limits weaker than expected in the absence of a signal. The largest excess, with a local significance of 3.1\u03c3, is observed for a Higgs boson mass hypothesis of 124 GeV. The global significance of observing an excess with a local significance \u2a7e3.1\u03c3 anywhere in the search range 110\u2013600 (110\u2013145) GeV is estimated to be 1.5\u03c3 (2.1\u03c3). More data are required to ascertain the origin of the observed excess.", "doi": "10.1016/j.physletb.2012.02.064", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-03-29", "series_number": "1", "volume": "710", "issue": "1", "pages": "26-48" }, { "id": "authors:q18pb-24781", "collection": "authors", "collection_id": "q18pb-24781", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120508-094806197", "type": "article", "title": "Measurement of the charge asymmetry in top-quark pair production in proton\u2013proton collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The difference in angular distributions between top quarks and antiquarks, commonly referred to as the charge asymmetry, is measured in pp collisions at the LHC with the CMS experiment. The data sample corresponds to an integrated luminosity of 1.09 fb^(\u22121) at a centre-of-mass energy of 7 TeV. Top-quark\npairs are selected in the final state with an electron or muon and four or more jets. At least one jet is identified as originating from b-quark hadronization. The charge asymmetry is measured in two variables, one based on the pseudorapidities (\u03b7) of the top quarks and the other on their rapidities (y). The results A^\u03b7_C = \u22120.017 \u00b1 0.032 (stat.)\n^(+0.025)_(\u22120.036) (syst.) and A^y_C = \u22120.013 \u00b1 0.028 (stat.)\n^(+0.029)_(\u22120.031) (syst.) are consistent within uncertainties with the standard-model predictions.", "doi": "10.1016/j.physletb.2012.01.078", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2012-03-13", "series_number": "1-2", "volume": "709", "issue": "1-2", "pages": "28-49" }, { "id": "authors:85mfk-ytv96", "collection": "authors", "collection_id": "85mfk-ytv96", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120417-112906934", "type": "article", "title": "Search for the Standard Model Higgs Boson in the Decay Channel H \u2192 ZZ \u2192 4l in pp Collisions at \u221as=7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a Higgs boson in the four-lepton decay channel H\u2192ZZ, with each Z boson decaying to an electron or muon pair, is reported. The search covers Higgs boson mass hypotheses in the range of 110100\u2009\u2009GeV (with 13 below 160 GeV), while 67.1\u00b16.0 (9.5\u00b11.3) events are expected from background. The four-lepton mass distribution is consistent with the expectation of standard model background production of ZZ pairs. Upper limits at 95% confidence level exclude the standard model Higgs boson in the ranges of 134\u2013158 GeV, 180\u2013305 GeV, and 340\u2013465 GeV. Small excesses of events are observed around masses of 119, 126, and 320 GeV, making the observed limits weaker than expected in the absence of a signal.", "doi": "10.1103/PhysRevLett.108.111804", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2012-03-13", "series_number": "11", "volume": "108", "issue": "11", "pages": "Art. No. 111804" }, { "id": "authors:br45d-cby93", "collection": "authors", "collection_id": "br45d-cby93", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120417-111121417", "type": "article", "title": "Search for Signatures of Extra Dimensions in the Diphoton Mass Spectrum at the Large Hadron Collider", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for signatures of extra spatial dimensions in the diphoton invariant-mass spectrum has been performed with the CMS detector at the LHC. No excess of events above the standard model expectation is observed using a data sample collected in proton-proton collisions at \u221as=7\u2009\u2009TeV corresponding to an integrated luminosity of 2.2\u2009\u2009fb^(-1). In the context of the large-extra-dimensions model, lower limits are set on the effective Planck scale in the range of 2.3\u20133.8 TeV at the 95% confidence level. These limits are the most restrictive bounds on virtual-graviton exchange to date. The most restrictive lower limits to date are also set on the mass of the first graviton excitation in the Randall-Sundrum model in the range of 0.86\u20131.84 TeV, for values of the associated coupling parameter between 0.01 and 0.10.", "doi": "10.1103/PhysRevLett.108.111801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2012-03-12", "series_number": "11", "volume": "108", "issue": "11", "pages": "Art. No. 111801" }, { "id": "authors:3bk5k-awb85", "collection": "authors", "collection_id": "3bk5k-awb85", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120508-094922484", "type": "article", "title": "Study of high-pT charged particle suppression in PbPb compared to pp collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "literal": "CMS Collaboration" } ], "abstract": "The transverse momentum spectra of charged particles have been measured in pp and PbPb collisions at \u221asNN=276 TeV by the CMS experiment at the LHC. In the transverse momentum range p_T = 5\u201310 GeV/c, the charged particle yield in the most central PbPb collisions is suppressed by up to a factor of 7 compared to the pp yield scaled by the number of incoherent nucleon\u2013nucleon collisions. At higher p_T, this suppression is significantly reduced, approaching roughly a factor of 2 for particles with p_T in the range p_T=40\u2013100 GeV/c.", "doi": "10.1140/epjc/s10052-012-1945-x", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2012-03", "series_number": "3", "volume": "72", "issue": "3", "pages": "Art. No. 1945" }, { "id": "authors:zdxnz-aj090", "collection": "authors", "collection_id": "zdxnz-aj090", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120529-144210125", "type": "article", "title": "Search for the standard model Higgs boson in the H \u2192 ZZ \u2192 2\u21132v channel in pp collisions at \u221as = 7TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the standard model Higgs boson in the H\u2009\u2192\u2009ZZ\u2009\u2192\u20092\u21132\u03bd decay channel, where \u2113\u2009=\u2009e or \u03bc, in pp collisions at a center-of-mass energy of 7 TeV is presented. The data were collected at the LHC, with the CMS detector, and correspond to an integrated luminosity of 4.6 fb^(\u22121). No significant excess is observed above the background expectation, and upper limits are set on the Higgs boson production cross section. The presence of the standard model Higgs boson with a mass in the 270-440 GeV range is excluded at 95% confidence level.", "doi": "10.1007/JHEP03(2012)040", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-03", "series_number": "3", "volume": "2012", "issue": "3", "pages": "Art. No. 40" }, { "id": "authors:1732n-0y487", "collection": "authors", "collection_id": "1732n-0y487", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120511-135804897", "type": "article", "title": "Search for the standard model Higgs boson in the H \u2192 ZZ \u2192 \u2113^+\u2113^\u2212\u03c4^+\u03c4^\u2212 decay channel in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is reported for the standard model Higgs boson in the H \u2192 ZZ \u2192 \u2113^+\u2113^\u2212\u03c4^+\u03c4^\u2212 decay mode, where \u2113 = \u03bc or e, in proton-proton collisions at \u221as = 7TeV , corresponding to an integrated luminosity of 4.7 fb^(\u22121) collected with the CMS detector at the LHC. No evidence is found for a significant deviation from the background expectation. An upper limit four to twelve times larger than the predicted value is set at 95% confidence level for the product of the standard model Higgs boson production cross section and decay branching fraction in the mass range 190 < m_H < 600 GeV.", "doi": "10.1007/JHEP03(2012)081", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-03", "series_number": "3", "volume": "2012", "issue": "3", "pages": "Art. No. 081" }, { "id": "authors:24jqy-16h02", "collection": "authors", "collection_id": "24jqy-16h02", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120302-131127358", "type": "article", "title": "Measurement of the rapidity and transverse momentum distributions of Z bosons in pp collisions at \u221a(s) = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the normalized rapidity (y) and transverse-momentum (q_T) distributions of Drell\u2013Yan muon and electron pairs in the Z-boson mass region (60", "doi": "10.1103/PhysRevD.85.032002", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2012-02-07", "series_number": "3", "volume": "85", "issue": "3", "pages": "Art. No. 032002" }, { "id": "authors:cahm3-93j33", "collection": "authors", "collection_id": "cahm3-93j33", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120514-084241196", "type": "article", "title": "J/\u03c8 and \u03c8(2S) production in pp collisions at \u221as = 7Tev", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di-Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the J/\u03c8 and \u03c8(2S) production cross sections in pp collisions at \u221as = 7TeV with the CMS experiment at the LHC is presented. The data sample corresponds to an integrated luminosity of 37 pb^(\u22121). Using a fit to the invariant mass and decay length distributions, production cross sections have been measured separately for prompt and non-prompt charmonium states, as a function of the meson transverse momentum in several rapidity ranges and integrated in the kinematical regions considered in this study. In addition, cross sections restricted to the acceptance of the CMS detector are given, which are not affected by the polarization of the charmonium states. The ratio of the differential production cross sections of the two states, where systematic uncertainties largely cancel, is also determined. The branching fraction of the inclusive B \u2192 \u03c8(2S)X decay is extracted from the ratio of the non-prompt cross sections to be:\nB(B \u2192 \u03c8(2S)X) = (3.08\u00b10.12(stat+syst.)\u00b10.13(theor.)\u00b10.42(B_(PDG)10^(\u22123)", "doi": "10.1007/JHEP02(2012)011", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-02", "series_number": "2", "volume": "2012", "issue": "2", "pages": "Art. No. 011" }, { "id": "authors:r15jk-8y354", "collection": "authors", "collection_id": "r15jk-8y354", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120215-134916254", "type": "article", "title": "Inclusive search for squarks and gluinos in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for heavy particle pairs produced in \u221as=7\u2009\u2009TeV proton-proton collisions with 35\u2009\u2009pb^(-1) of data collected by the CMS experiment at the LHC. The search is sensitive to squarks and gluinos of generic supersymmetry models, provided they are kinematically accessible, with minimal assumptions on properties of the lightest superpartner particle. The kinematic consistency of the selected events is tested against the hypothesis of heavy particle pair production using the dimensionless razor variable R, related to the missing transverse energy E_T^(miss). The new physics signal is characterized by a broad peak in the distribution of M_R, an event-by-event indicator of the heavy particle mass scale. This new approach is complementary to E_T^(miss)-based searches. After background modeling based on data, and background rejection based on R and M_R, no significant excess of events is found beyond the standard model expectations. The results are interpreted in the context of the constrained minimal supersymmetric standard model as well as two simplified supersymmetry models.", "doi": "10.1103/PhysRevD.85.012004", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2012-01-11", "series_number": "1", "volume": "85", "issue": "1", "pages": "Art. No. 012004" }, { "id": "authors:zcwzd-66x65", "collection": "authors", "collection_id": "zcwzd-66x65", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120326-105151343", "type": "article", "title": "Forward energy flow, central charged-particle multiplicities, and pseudorapidity gaps in W and Z boson events from pp collisions at \u221as =7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A study of forward energy flow and central charged-particle multiplicity in events with W and Z bosons decaying into leptons is presented. The analysis uses a sample of 7 TeV pp collisions, corresponding to an integrated luminosity of 36 pb^(\u22121), recorded by the CMS experiment at the LHC. The observed forward energy depositions, their correlations, and the central charged-particle multiplicities are not well described by the available non-diffractive soft-hadron production models. A study of about 300 events with no significant energy deposited in one of the forward calorimeters, corresponding to a pseudorapidity gap of at least 1.9 units, is also presented. An indication for a diffractive component in these events comes from the observation that the majority of the charged leptons from the W(Z) decays are found in the hemisphere opposite to the gap. When fitting the signed lepton pseudorapidity distribution of these events with predicted distributions from an admixture of diffractive (pompyt) and non-diffractive (pythia) Monte Carlo simulations, the diffractive component is determined to be (50.0 \u00b1 9.3 (stat.) \u00b1 5.2 (syst.))%.", "doi": "10.1140/epjc/s10052-011-1839-3", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2012-01", "series_number": "1", "volume": "72", "issue": "1", "pages": "Art. No. 1839" }, { "id": "authors:bn35m-men78", "collection": "authors", "collection_id": "bn35m-men78", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120508-094628788", "type": "article", "title": "Jet production rates in association with W and Z bosons in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of jet production rates in association with W and Z bosons for jet transverse momenta above 30 GeV are reported, using a sample of proton-proton collision events recorded by CMS at\n\u221as = 7TeV, corresponding to an integrated luminosity of 36 pb^(-1). The study includes the measurement of the normalized inclusive rates of jets \u03c3(V+ \u2265n jets)/\u03c3(V), where V represents either a W or a Z. In addition, the ratio of W to Z cross sections and the W charge asymmetry as a function of the number of associated\njets are measured. A test of scaling at \u221as = 7TeV is also presented. The measurements provide a stringent test of perturbative-QCD calculations and are sensitive to the possible\npresence of new physics. The results are in agreement with the predictions of a simulation\nthat uses explicit matrix element calculations for nal states with jets.", "doi": "10.1007/JHEP01(2012)010", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-01", "series_number": "1", "volume": "2012", "issue": "1", "pages": "Art. No. 10" }, { "id": "authors:1hebm-10h74", "collection": "authors", "collection_id": "1hebm-10h74", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120619-130534767", "type": "article", "title": "Performance of \u03c4-lepton reconstruction and identification in CMS", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The performance of \u03c4-lepton reconstruction and identification algorithms is studied using a data sample of proton-proton collisions at \u221as = 7 TeV, corresponding to an integrated luminosity of 36 pb^(\u22121) collected with the CMS detector at the LHC. The \u03c4 leptons that decay into one or three charged hadrons, zero or more short-lived neutral hadrons, and a neutrino are identified using final-state particles reconstructed in the CMS tracker and electromagnetic calorimeter. The reconstruction efficiency of the algorithms is measured using \u03c4 leptons produced in Z-boson decays. The \u03c4-lepton misidentification rates for jets and electrons are determined.", "doi": "10.1088/1748-0221/7/01/P01001", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2012-01", "series_number": "1", "volume": "7", "issue": "1", "pages": "Art. No. P01001" }, { "id": "authors:g2scd-aew53", "collection": "authors", "collection_id": "g2scd-aew53", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120508-094329148", "type": "article", "title": "Exclusive \u03b3\u03b3 \u2192 \u00b5^+\u00b5^- production in proton-proton collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Yousi" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-Kyoungha" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at s=7 TeV, pp \u2192 p\u03bc^+ \u03bc^\u2212p, is reported using data corresponding to an integrated luminosity of 40 pb^(\u22121). For muon pairs with invariant mass greater than 11.5 GeV, transverse momentum p_T (\u03bc) > 4 GeV and pseudorapidity |\u03b7(\u03bc)| < 2.1, a fit to the dimuon p_T (\u03bc^+ \u03bc^\u2212) distribution results in a measured cross section of \u03c3(p \u2192 p\u03bc^+ \u03bc^\u2212p) = 338^(+058)_(\u2212055) (stat.) \u00b1 0.16 (syst.) \u00b1 0.14 (lumi.) pb, consistent with the theoretical prediction evaluated with the event generator Lpair. The ratio to the predicted cross section is 083^(+058)_(\u2212013) (stat.) \u00b1 0.04 (syst.) \u00b1 0.03 (lumi.). The characteristic distributions of the muon pairs produced via \u03b3\u03b3 fusion, such as the muon acoplanarity, the muon pair invariant mass and transverse momentum agree with those from the theory.", "doi": "10.1007/JHEP01(2012)052", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2012-01", "series_number": "1", "volume": "2012", "issue": "1", "pages": "Art. No. 052" }, { "id": "authors:4cr5h-hab50", "collection": "authors", "collection_id": "4cr5h-hab50", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120201-140451325", "type": "article", "title": "Search for a Vectorlike Quark with Charge 2/3 in t + Z Events from pp Collisions at p \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair-produced heavy vectorlike charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14\u2009\u2009fb^(-1), the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T\u2192tZ, a T quark with a mass less than 475\u2009\u2009GeV/c2 is excluded at the 95% confidence level.", "doi": "10.1103/PhysRevLett.107.271802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-12-29", "series_number": "27", "volume": "107", "issue": "27", "pages": "Art. No. 271802" }, { "id": "authors:vqjpd-s2m62", "collection": "authors", "collection_id": "vqjpd-s2m62", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120117-110940745", "type": "article", "title": "Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "literal": "CMS Collaboration" } ], "abstract": "A multivariate likelihood method to measure electroweak couplings with the Drell\u2013Yan process at the LHC is presented. The process is described by the dilepton rapidity, invariant mass, and decay angle distributions. The decay angle ambiguity due to the unknown assignment of the scattered constituent quark and antiquark to the two protons in a collision is resolved statistically using correlations between the observables. The method is applied to a sample of dimuon events from proton-proton collisions at \u221as=7\u2009\u2009TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 1.1\u2009\u2009fb^(-1). From the dominant uu\u0305 , dd\u0305 \u2192 \u03b3^*/Z \u2192 \u03bc^-\u03bc^+ process, the effective weak mixing angle parameter is measured to be sin^2\u03b8_(eff)=0.2287\u00b10.0020\u2009(stat.)\u00b10.0025\u2009(syst.). This result is consistent with measurements from other processes, as expected within the standard model.", "doi": "10.1103/PhysRevD.84.112002", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2011-12-08", "series_number": "11", "volume": "84", "issue": "11", "pages": "Art. No. 112002" }, { "id": "authors:apcfe-efz51", "collection": "authors", "collection_id": "apcfe-efz51", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120103-092628480", "type": "article", "title": "Search for Supersymmetry at the LHC in Events with Jets and Missing Transverse Energy", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for events with jets and missing transverse energy is performed in a data sample of pp collisions collected at \u221as=7\u2009\u2009TeV by the CMS experiment at the LHC. The analyzed data sample corresponds to an integrated luminosity of 1.14\u2009\u2009fb^(-1). In this search, a kinematic variable \u03b1_T is used as the main discriminator between events with genuine and misreconstructed missing transverse energy. No excess of events over the standard model expectation is found. Exclusion limits in the parameter space of the constrained minimal supersymmetric extension of the standard model are set. In this model, squark masses below 1.1 TeV are excluded at 95% C.L. Gluino masses below 1.1 TeV are also ruled out at 95% C.L. for values of the universal scalar mass parameter below 500 GeV.", "doi": "10.1103/PhysRevLett.107.221804", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-11-21", "series_number": "22", "volume": "107", "issue": "22", "pages": "Art. No. 221804" }, { "id": "authors:h14ds-f8830", "collection": "authors", "collection_id": "h14ds-f8830", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120201-142806383", "type": "article", "title": "Measurement of the tt production cross section in pp collisions at 7 TeV in lepton + jets events using b-quark jet identification", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" } ], "abstract": "A new measurement of the inclusive production cross section for pp\u2192tt\u0305 is performed at a center-of-mass energy of 7 TeV using data collected by the CMS experiment at the LHC. The analysis uses a data sample corresponding to an integrated luminosity of 36\u2009\u2009pb-1, and is based on the final state with one isolated, high transverse momentum muon or electron, missing transverse energy, and hadronic jets. The tt\u0305 content of the selected events is enhanced by requiring the presence of at least one jet consistent with b-quark hadronization. The measured cross section is 150\u00b19(stat)\u00b117(syst)\u00b16(lumi)\u2009\u2009pb and is in agreement with higher-order QCD calculations. The combination of this measurement with a previous CMS result based on dileptons gives 154\u00b117(stat+syst)\u00b16(lumi)\u2009\u2009pb.", "doi": "10.1103/PhysRevD.84.092004", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2011-11-14", "series_number": "9", "volume": "84", "issue": "9", "pages": "Art. No. 092004" }, { "id": "authors:stv4z-bye65", "collection": "authors", "collection_id": "stv4z-bye65", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120103-084622873", "type": "article", "title": "Search for New Physics with a Monojet and Missing Transverse Energy in pp Collisions at \u221as=7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A study of events with missing transverse energy and an energetic jet is performed using pp collision data at a center-of-mass energy of 7 TeV. The data were collected by the CMS detector at the LHC, and correspond to an integrated luminosity of 36\u2009\u2009pb^(-1). An excess of these events over standard model contributions is a signature of new physics such as large extra dimensions and unparticles. The number of observed events is in good agreement with the prediction of the standard model, and significant extension of the current limits on parameters of new physics benchmark models is achieved.", "doi": "10.1103/PhysRevLett.107.201804", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-11-10", "series_number": "20", "volume": "107", "issue": "20", "pages": "Art. No. 201804" }, { "id": "authors:ypr28-5x609", "collection": "authors", "collection_id": "ypr28-5x609", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120109-082948661", "type": "article", "title": "Search for B_s^0\u2192\u03bc^+\u03bc^- and B^0\u2192\u03bc^+\u03bc^- Decays in pp Collisions at \u221as=7\u2009\u2009TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for the rare decays B_s^0\u2192\u03bc^+\u03bc^- and B^0\u2192\u03bc^+\u03bc^- is performed in pp collisions at \u221as=7\u2009\u2009TeV, with a data sample corresponding to an integrated luminosity of 1.14\u2009\u2009fb^(-1), collected by the CMS experiment at the LHC. In both cases, the number of events observed after all selection requirements is consistent with expectations from background and standard-model signal predictions. The resulting upper limits on the branching fractions are B(B_s^0\u2192\u03bc^+\u03bc^-)<1.9\u00d710^(-8) and B(B^0\u2192\u03bc^+\u03bc^-)<4.6\u00d710^(-9), at 95% confidence level.", "doi": "10.1103/PhysRevLett.107.191802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-11-04", "series_number": "19", "volume": "107", "issue": "19", "pages": "Art. No. 191802" }, { "id": "authors:13b7b-2t652", "collection": "authors", "collection_id": "13b7b-2t652", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120906-080358612", "type": "article", "title": "Measurement of energy flow at large pseudorapidities in pp collisions at \u221as = 0.9 and 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" } ], "abstract": "The energy flow, dE/d\u03b7, is studied at large pseudorapidities in proton-proton collisions at the LHC, for centre-of-mass energies of 0.9 and 7 TeV. The measurements are made using the CMS detector in the pseudorapidity range 3.15 < |\u03b7| < 4.9, for both minimum-bias events and events with at least two high-momentum jets. The data are compared to various pp Monte Carlo event generators whose theoretical models and input parameter values are sensitive to the energy-flow measurements. Inclusion of multiple-parton interactions in the Monte Carlo event generators is found to improve the description of the energy-flow measurements.", "doi": "10.1007/JHEP11(2011)148", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-11", "series_number": "11", "volume": "2011", "issue": "11", "pages": "Art. No. 148" }, { "id": "authors:q5njn-s4w78", "collection": "authors", "collection_id": "q5njn-s4w78", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120106-113025473", "type": "article", "title": "Search for physics beyond the standard model using multilepton signatures in pp collisions at \u221as=7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for physics beyond the standard model in events with at least three leptons and any number of jets is presented. The data sample corresponds to 35 pb^(\u22121) of integrated luminosity in pp collisions at \u221as=7 TeV collected by the CMS experiment at the LHC. A number of exclusive multileptonic channels are investigated and standard model backgrounds are suppressed by requiring sufficient missing transverse energy, invariant mass inconsistent with that of the Z boson, or high jet activity. Control samples in data are used to ascertain the robustness of background evaluation techniques and to minimise the reliance on simulation. The observations are consistent with background expectations. These results constrain previously unexplored regions of supersymmetric parameter space.", "doi": "10.1016/j.physletb.2011.09.047", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-10-25", "series_number": "5", "volume": "704", "issue": "5", "pages": "411-433" }, { "id": "authors:a5ezn-2nv15", "collection": "authors", "collection_id": "a5ezn-2nv15", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111214-112928948", "type": "article", "title": "Search for resonances in the dijet mass spectrum from 7 TeV pp collisions at CMS", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for narrow resonances with a mass of at least 1 TeV in the dijet mass spectrum is performed using pp collisions at \u221as = 7 TeV corresponding to an integrated luminosity of 1 fb^(\u22121), collected by the CMS experiment at the LHC. No resonances are observed. Upper limits at the 95% confidence level are presented on the product of the resonance cross section, branching fraction into dijets, and acceptance, separately for decays into quark\u2013quark, quark\u2013gluon, and gluon\u2013gluon pairs. The data exclude new particles predicted in the following models at the 95% confidence level: string resonances with mass less than 4.00 TeV, E_6 diquarks with mass less than 3.52 TeV, excited quarks with mass less than 2.49 TeV, axigluons and colorons with mass less than 2.47 TeV, and W\u2032 bosons with mass less than 1.51 TeV. These results extend previous exclusions from the dijet mass search technique.", "doi": "10.1016/j.physletb.2011.09.015", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-10-13", "series_number": "3", "volume": "704", "issue": "3", "pages": "123-142" }, { "id": "authors:cqrgw-x8715", "collection": "authors", "collection_id": "cqrgw-x8715", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111214-112721525", "type": "article", "title": "A search for excited leptons in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for excited leptons is carried out with the CMS detector at the LHC, using 36 pb^(\u22121) of pp collision data recorded at \u221as = 7 TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton pp\u2192\u2113\u2113^*, followed by the decay \u2113^*\u2192\u2113\u03b3, resulting in the \u2113\u2113\u03b3 final state, where \u2113=e,\u03bc. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of \u2113^* production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for \u2113^* production at this collision energy. The exclusion region in the compositeness scale \u039b and excited lepton mass M_(\u2113*) parameter space is extended beyond previously established limits. For \u039b=M_(\u2113*), excited lepton masses are excluded below 1070 GeV/c^2 for e^* and 1090 GeV/c^2 for \u03bc^* at the 95% confidence level.", "doi": "10.1016/j.physletb.2011.09.021", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-10-13", "series_number": "3", "volume": "704", "issue": "3", "pages": "143-162" }, { "id": "authors:kbypt-5r135", "collection": "authors", "collection_id": "kbypt-5r135", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120103-094720015", "type": "article", "title": "Measurement of the inclusive W and Z production cross sections in pp collisions at \u221as = 7 TeV with the CMS experiment", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of inclusive W and Z production cross sections in pp collisions at \u221as = 7TeV is presented. The electron and muon decay channels are analyzed in a data\nsample collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 pb^(-1). The measured inclusive cross sections are \u03c3(pp \u2192 WX) x B(W \u2192\n\u2113v) = 10.31 0.02 (stat.) \u00b1 0.09 (syst.) \u00b1 0.10 (th.) \u00b1 0.41 (lumi.) nb and \u03c3(pp \u2192 ZX) x B(Z \u2192 \u2113^+\u2113^-) = 0.974 \u00b1 0.007 (stat.) \u00b1 0.007 (syst.) \u00b1 0.018 (th.) \u00b1 0.039 (lumi.) nb, limited to the dilepton invariant mass range 60 to 120 GeV. The luminosity-independent cross section ratios are (\u03c3(pp \u2192 WX) x B(W \u2192 \u2113v)) / (\u03c3(pp \u2192 ZX) x B(Z \u2192 \u2113^+\u2113^-)) = 10.54 \u00b1 0.07 (stat.) \u00b1 0.08 (syst.) \u00b1 0.16 (th.) and (\u03c3(pp \u2192 W^+X) x B(W^+ \u2192 \u2113^+v)) /(\u03c3(pp \u2192 W^-X) x B(W^- \u2192 \u2113^-v)) = 1.421\u00b10.006 (stat.)\u00b10.014 (syst.)\u00b10.029 (th.). The measured values agree with next-to-next-to-leading order QCD cross section calculations based on recent parton distribution functions.", "doi": "10.1007/JHEP10(2011)132", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-10", "series_number": "10", "volume": "2011", "issue": "10", "pages": "Art. No. 132" }, { "id": "authors:v62rj-ntd54", "collection": "authors", "collection_id": "v62rj-ntd54", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120117-102156315", "type": "article", "title": "Measurement of the Drell-Yan cross section in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "literal": "CMS Collaboration" } ], "abstract": "The Drell-Yan differential cross section is measured in pp collisions at \u221as=7 TeV, from a data sample collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 36 pb^(\u22121). The cross section measurement, normalized to the measured cross section in the Z region, is reported for both the dimuon and dielectron channels in the dilepton invariant mass range 15\u2013600 GeV. The normalized cross section values are quoted both in the full phase space and within the detector acceptance. The effect of final state radiation is also identified. The results are found to agree with theoretical predictions.", "doi": "10.1007/JHEP10(2011)007", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-10", "series_number": "10", "volume": "2011", "issue": "10", "pages": "Art. No. 007" }, { "id": "authors:txtvv-xt167", "collection": "authors", "collection_id": "txtvv-xt167", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120810-085159240", "type": "article", "title": "Measurement of the differential cross section for isolated prompt photon production in pp collisions at 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Di Marco", "given_name": "E.", "clpid": "Di-Marco-E" }, { "family_name": "Duarte", "given_name": "J.", "clpid": "Duarte-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the differential cross section for the inclusive production of isolated prompt photons in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The data sample corresponds to an integrated luminosity of 36\u2009\u2009pb-1 recorded by the CMS detector at the LHC. The measurement covers the pseudorapidity range |\u03b7|<2.5 and the transverse energy range 25", "doi": "10.1103/PhysRevD.84.052011", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2011-09-29", "series_number": "5", "volume": "84", "issue": "5", "pages": "Art. No. 052011" }, { "id": "authors:x3rdp-9kj72", "collection": "authors", "collection_id": "x3rdp-9kj72", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111222-115337167", "type": "article", "title": "Measurement of the underlying event activity at the\n LHC with \u221as = 7 TeV and comparison with \u221as = 0.9 TeV", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the underlying activity in events with a jet of transverse momentum in the several GeV region is performed in proton-proton collisions at \u221as = 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |\u03b7|<2 and transverse momentum p_T > 0.5 GeV/c is\nstudied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A signicant growth of the average multiplicity and scalar-p_T sum of the particles in the transverse region is observed with increasing p_T of the leading trackjet, followed by a much slower rise above a few GeV/c. For track-jet p_T larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in pythia are compared to the data.", "doi": "10.1007/JHEP09(2011)109", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-09-23", "series_number": "9", "volume": "2011", "issue": "9", "pages": "109" }, { "id": "authors:f3894-j5x19", "collection": "authors", "collection_id": "f3894-j5x19", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111011-093427295", "type": "article", "title": "Measurement of the Inclusive Jet Cross Section in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The inclusive jet cross section is measured in pp collisions with a center-of-mass energy of 7 TeV at the Large Hadron Collider using the CMS experiment. The data sample corresponds to an integrated luminosity of 34\u2009\u2009pb^(-1). The measurement is made for jet transverse momenta in the range 18\u20131100 GeV and for absolute values of rapidity less than 3. The measured cross section extends to the highest values of jet p_T ever observed and, within the experimental and theoretical uncertainties, is generally in agreement with next-to-leading-order perturbative QCD predictions", "doi": "10.1103/PhysRevLett.107.132001", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-09-19", "series_number": "13", "volume": "107", "issue": "13", "pages": "Art. No. 0132001" }, { "id": "authors:m0ys8-f5z51", "collection": "authors", "collection_id": "m0ys8-f5z51", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111028-161419323", "type": "article", "title": "Search for first generation scalar leptoquarks in the e\u03bdjj channel in pp collisions at \u221as = 7 Tev", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair-production of first generation scalar leptoquarks is performed in the final state containing an electron, a neutrino, and at least two jets using proton\u2013proton collision data at \u221as = 7 TeV. The data were collected by the CMS detector at the LHC, corresponding to an integrated luminosity of 36 pb^(\u22121). The number of observed events is in good agreement with the predictions for standard model processes. Prior CMS results in the dielectron channel are combined with this electron + neutrino search. A 95% confidence level combined lower limit is set on the mass of a first generation scalar leptoquark at 339 GeV for \u03b2=0.5, where \u03b2 is the branching fraction of the leptoquark to an electron and a quark. These results represent the most stringent direct limits to date for values of \u03b2 greater than 0.05.", "doi": "10.1016/j.physletb.2011.07.089", "issn": "0370-2693", "publisher": "American Physical Society", "publication": "Physics Letters B", "publication_date": "2011-09-14", "series_number": "3", "volume": "703", "issue": "3", "pages": "246-266" }, { "id": "authors:w1gm5-v2f04", "collection": "authors", "collection_id": "w1gm5-v2f04", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111107-090001325", "type": "article", "title": "Missing transverse energy performance of the CMS detector", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "During 2010 the LHC delivered pp collisions with a centre-of-mass energy of 7 TeV. In this paper, the results of comprehensive studies of missing transverse energy as measured by the CMS detector are presented. The results cover the measurements of the scale and resolution for missing transverse energy, and the effects of multiple pp interactions within the same bunch crossings on the scale and resolution. Anomalous measurements of missing transverse energy are studied, and algorithms for their identification are described. The performance of several reconstruction algorithms for calculating missing transverse energy are compared. An algorithm, called missing-transverse-energy significance, which estimates the compatibility of the reconstructed missing transverse energy with zero, is described, and its performance is demonstrated.", "doi": "10.1088/1748-0221/6/09/P09001", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2011-09-09", "volume": "6", "pages": "Art. No. P09001" }, { "id": "authors:z44hm-f9f27", "collection": "authors", "collection_id": "z44hm-f9f27", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120201-131713590", "type": "article", "title": "Measurement of the B_s^0 Production Cross Section with B_s^0 \u2192 J/\u03c8\u00f8 Decays in pp Collissions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The B_s^0 differential production cross section is measured as functions of the transverse momentum and rapidity in pp collisions at \u221as=7\u2009\u2009TeV, using the B_s^0\u2192J/\u03c8\u03d5 decay, and compared with predictions based on perturbative QCD calculations at next-to-leading order. The data sample, collected by the CMS experiment at the LHC, corresponds to an integrated luminosity of 40\u2009\u2009pb^(-1). The B_s^0 is reconstructed from the decays J/\u03c8 \u2192 \u03bc^+\u03bc^- and \u03d5 \u2192 K^+K^-. The integrated B_s^0 cross section times B_s^0 \u2192 J/\u03c8\u03d5 branching fraction in the range 8 < p_T^B < 50\u2009\u2009GeV/c and |y^B| < 2.4 is measured to be 6.9\u00b10.6\u00b10.6\u2009\u2009nb, where the first uncertainty is statistical and the second is systematic.", "doi": "10.1103/PhysRevD.84.052008", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2011-09-01", "series_number": "5", "volume": "84", "issue": "5", "pages": "Art. No. 052008" }, { "id": "authors:c89c0-gbw76", "collection": "authors", "collection_id": "c89c0-gbw76", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111115-113538365", "type": "article", "title": "Measurement of the tt production cross section in pp collisions at \u221as = 7 TeV using the kinematic properties of events with leptons and jets", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the tt production cross section in proton-proton collisions at a centre-of-mass energy of 7 TeV has been performed at the LHC with the CMS detector. The analysis uses a data sample corresponding to an integrated luminosity of 36 pb^(\u22121) and is based on the reconstruction of the final state with one isolated, high transverse-momentum electron or muon and three or more hadronic jets. The kinematic properties of the events are used to separate the tt signal from W+jets and QCD multijet background events. The measured cross section is 173^(+39)_(\u221232) (stat+syst) pb, consistent with standard model expectations.", "doi": "10.1140/epjc/s10052-011-1721-3", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2011-09", "series_number": "9", "volume": "71", "issue": "9", "pages": "Art. No. 1721" }, { "id": "authors:65w7c-ppa23", "collection": "authors", "collection_id": "65w7c-ppa23", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110920-142850370", "type": "article", "title": "Search for Three-Jet Resonances in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for three-jet hadronic resonance production in pp collisions at a center-of-mass energy of\n7 TeV has been conducted by the CMS Collaboration at the LHC, using a data sample corresponding to an\nintegrated luminosity of 35 pb^(-1). Events with high jet multiplicity and a large scalar sum of jet transverse\nmomenta are analyzed using a signature-based approach. The number of expected standard model\nbackground events is found to be in good agreement with the observed events. Limits on the cross\nsection times branching ratio are set in a model of gluino pair production with an R-parity-violating decay\nto three quarks, and the data rule out such particles within the mass range of 200 to 280 GeV/c^2.", "doi": "10.1103/PhysRevLett.107.101801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-08-29", "series_number": "10", "volume": "107", "issue": "10", "pages": "Art. No. 101801" }, { "id": "authors:r4fv2-3xf92", "collection": "authors", "collection_id": "r4fv2-3xf92", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110926-065524231", "type": "article", "title": "Measurement of the ratio of the 3-jet to 2-jet cross sections in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Boos", "given_name": "E.", "clpid": "Boos-E" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the ratio of the inclusive 3-jet to 2-jet cross sections as a function of the total jet transverse momentum, H_T, in the range 0.20.5 TeV. This measurement extends to an H_T range that has not been explored before.", "doi": "10.1016/j.physletb.2011.07.067", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-08-26", "series_number": "5", "volume": "702", "issue": "5", "pages": "336-354" }, { "id": "authors:yvyrw-fyp22", "collection": "authors", "collection_id": "yvyrw-fyp22", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110920-140439086", "type": "article", "title": "Measurement of the t-Channel Single Top Quark Production Cross Section in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Electroweak production of the top quark is measured for the first time in pp collisions at \u221as=7\u2009\u2009TeV, using a data set collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36\u2009\u2009pb^(-1). With an event selection optimized for t-channel production, two complementary analyses are performed. The first one exploits the special angular properties of the signal, together with background estimates from the data. The second approach uses a multivariate analysis technique to probe the compatibility with signal topology expected from electroweak top-quark production. The combined measurement of the cross section is 83.6\u00b129.8(stat+syst)\u00b13.3(lumi)\u2009\u2009pb, consistent with the standard model expectation.", "doi": "10.1103/PhysRevLett.107.091802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-08-25", "series_number": "9", "volume": "107", "issue": "9", "pages": "Art. No. 091802" }, { "id": "authors:r5wjz-8b822", "collection": "authors", "collection_id": "r5wjz-8b822", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110908-104523014", "type": "article", "title": "Observation and studies of jet quenching in PbPb collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV was studied with the Compact Muon Solenoid (CMS) detector at the LHC, using a data sample corresponding to an integrated luminosity of 6.7 \u03bcb^(\u22121). Jets are reconstructed using the energy deposited in the CMS calorimeters and studied as a function of collision centrality. With increasing collision centrality, a striking imbalance in dijet transverse\nmomentum is observed, consistent with jet quenching. The observed effect extends from the lower cutoff used\nin this study (jet pT = 120 GeV/c) up to the statistical limit of the available data sample (jet pT \u2248 210 GeV/c).\nCorrelations of charged particle tracks with jets indicate that the momentum imbalance is accompanied by a softening of the fragmentation pattern of the second most energetic, away-side jet. The dijet momentum balance is recovered when integrating low transverse momentum particles distributed over a wide angular range relative to the direction of the away-side jet.", "doi": "10.1103/PhysRevC.84.024906", "issn": "0556-2813", "publisher": "American Physical Society", "publication": "Physical Review C", "publication_date": "2011-08-12", "series_number": "2", "volume": "84", "issue": "2", "pages": "Art. No. 024906" }, { "id": "authors:mchrr-36d17", "collection": "authors", "collection_id": "mchrr-36d17", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111018-082242220", "type": "article", "title": "Search for same-sign top-quark pair production at \u221as = 7 TeV and limits on flavour changing neutral currents in the top sector", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "An inclusive search for same-sign top-quark pair production in pp collisions at \u221as = 7 TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 pb^(\u22121). This analysis is motivated by recent studies of pp \u2192 tt reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t-channel exchange of a massive neutral vector boson (Z\u2032). Models with such a Z\u2032 also predict enhancement of same-sign top-pair production in pp or pp collisions. Limits are set as a function of the Z\u2032 mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.", "doi": "10.1007/JHEP08(2011)005", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-08", "series_number": "8", "volume": "2011", "issue": "8", "pages": "Art. No. 005" }, { "id": "authors:qq0a5-9s341", "collection": "authors", "collection_id": "qq0a5-9s341", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111114-095430666", "type": "article", "title": "Dependence on pseudorapidity and on centrality of\n charged hadron production in PbPb collisions at \u221as_(NN)=2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dias", "given_name": "F. A.", "clpid": "Dias-F-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement is presented of the charged hadron multiplicity in hadronic\nPbPb collisions, as a function of pseudorapidity and centrality, at a collision energy of\n2.76TeV per nucleon pair. The data sample is collected using the CMS detector and\na minimum-bias trigger, with the CMS solenoid off. The number of charged hadrons is\nmeasured both by counting the number of reconstructed particle hits and by forming hit\ndoublets of pairs of layers in the pixel detector. The two methods give consistent results.\nThe charged hadron multiplicity density, dN_(ch)/d_\u03b7|\u03b7=0, for head-on collisions is found to be\n1612\u00b155, where the uncertainty is dominated by systematic effects. Comparisons of these\nresults to previous measurements and to various models are also presented.", "doi": "10.1007/JHEP08(2011)141", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-08", "series_number": "8", "volume": "2011", "issue": "8", "pages": "Art. No. 141" }, { "id": "authors:3a06z-a5d89", "collection": "authors", "collection_id": "3a06z-a5d89", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111115-100748094", "type": "article", "title": "Charged particle transverse momentum spectra in pp\n collisions at \u221as = 0.9 and 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The charged particle transverse momentum (p T) spectra are presented for pp collisions at \u221as=09 and 7 TeV. The data samples were collected with the CMS detector at the LHC and correspond to integrated luminosities of 231 \u03bcb^(\u22121) and 2.96 pb^(\u22121), respectively. Calorimeter-based high-transverse-energy triggers are employed to enhance the statistical reach of the high-p T measurements. The results are compared with leading and next-to-leading order QCD and with an empirical scaling of measurements at different collision energies using the scaling variable x_T\u22612p_T/\u221as over the p T range up to 200 GeV/c. Using a combination of x T scaling and direct interpolation at fixed p T, a reference transverse momentum spectrum at \u221as = 276 TeV is constructed, which can be used for studying high-p T particle suppression in the dense QCD medium produced in heavy-ion collisions at that centre-of-mass energy.", "doi": "10.1007/JHEP08(2011)086", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-08", "series_number": "8", "volume": "2011", "issue": "8", "pages": "Art. No. 086" }, { "id": "authors:a2xtz-s2m24", "collection": "authors", "collection_id": "a2xtz-s2m24", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111111-133542418", "type": "article", "title": "Search for supersymmetry in pp collisions at \u221as = 7 TeV in events with a single lepton, jets, and missing transverse momentum", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Results are reported from a search for physics beyond the standard model in proton-proton collisions at a center-of-mass energy of 7 TeV, focusing on the signature with a single, isolated, high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The data sample comprises an integrated luminosity of 36 pb^(\u22121), recorded by the CMS experiment at the LHC. The search is motivated by models of new physics, including supersymmetry. The observed event yields are consistent with standard model backgrounds predicted using control samples obtained from the data. The characteristics of the event sample are consistent with those expected for the production of tt and W\u2009+\u2009jets events. The results are interpreted in terms of limits on the parameter space for the constrained minimal supersymmetric extension of the standard model.", "doi": "10.1007/JHEP08(2011)156", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-08", "series_number": "8", "volume": "2011", "issue": "8", "pages": "Art. No. 156" }, { "id": "authors:40hh9-kfh17", "collection": "authors", "collection_id": "40hh9-kfh17", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111115-091241392", "type": "article", "title": "Search for new physics with jets and missing transverse momentum in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for new physics is presented based on an event signature of at least three jets accompanied by large missing transverse momentum, using a data sample corresponding to an integrated luminosity of 36 pb^(\u22121) collected in proton-proton collisions at \u221as=7 TeV with the CMS detector at the LHC. No excess of events is observed above the expected standard model backgrounds, which are all estimated from the data. Exclusion limits are presented for the constrained minimal supersymmetric extension of the standard model. Cross section limits are also presented using simplified models with new particles decaying to an undetected particle and one or two jets.", "doi": "10.1007/JHEP08(2011)155", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-08", "series_number": "8", "volume": "2011", "issue": "8", "pages": "Art. No. 155" }, { "id": "authors:eyhbk-mk246", "collection": "authors", "collection_id": "eyhbk-mk246", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111115-110057375", "type": "article", "title": "Measurement of the inclusive Z cross section via decays to tau pairs in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The first measurement of inclusive Z\u2009\u2192\u2009\u03c4^+ \u03c4^\u2212 production in pp collisions at the LHC is presented, in the final states \u03bc\u2009+\u2009hadrons, e\u2009+\u2009hadrons, e\u2009+\u2009\u03bc, and \u03bc\u2009+\u2009\u03bc. The data sample corresponds to an integrated luminosity of 36 pb^(\u22121) collected with the CMS detector. The measured cross section is \u03c3 (pp\u2009\u2192\u2009ZX)\u2009\u00d7\u2009B (Z\u2009\u2192\u2009\u03c4^+ \u03c4^\u2212)\u2009=\u20091.00\u2009\u00b1\u20090.05(stat.)\u2009\u00b1\u20090.08(syst.)\u2009\u00b1\u20090.04(lumi.)nb, which is in good agreement with the next-to-next-to-leading order QCD prediction and improves on previous measurements in the Z\u2009\u2192\u2009e^+e^\u2212 and \u03bc^+ \u03bc^\u2212 channels. The reconstruction efficiency for hadronic \u03c4 decays is determined with a precision of 7%.", "doi": "10.1007/JHEP08(2011)117", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-08", "series_number": "8", "volume": "2011", "issue": "8", "pages": "Art. No. 117" }, { "id": "authors:tsw54-hca77", "collection": "authors", "collection_id": "tsw54-hca77", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110822-103115801", "type": "article", "title": "Indications of Suppression of Excited Y States in Pb-Pb Collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A comparison of the relative yields of \u03a5 resonances in the \u03bc^+\u03bc^- decay channel in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair of 2.76 TeV is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4\u2009\u2009GeV/c and pseudorapidity below 2.4, the double ratio of the \u03a5(2S) and \u03a5(3S) excited states to the \u03a5(1S) ground state in Pb-Pb and pp collisions, [\u03a5(2S+3S)/\u03a5(1S)]_(Pb-Pb)/[\u03a5(2S+3S)/\u03a5(1S)]_(pp), is found to be .31_(-0.15)^(+0.19)(stat)\u00b10.03(syst). The probability to obtain the measured value, or lower, if the true double ratio is unity, is calculated to be less than 1%.", "doi": "10.1103/PhysRevLett.107.052302", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-07-28", "series_number": "5", "volume": "107", "issue": "5", "pages": "Art. No. 052302" }, { "id": "authors:e2h2g-zch14", "collection": "authors", "collection_id": "e2h2g-zch14", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110907-090537622", "type": "article", "title": "Measurement of W\u03b3 and Z\u03b3 production in pp collisions at\n \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of W\u03b3 and Z\u03b3 production in proton\u2013proton collisions at \u221as = 7 TeV is presented. Results are based on a data sample recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36 pb^(\u22121). The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy E_t^y > 10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle \u0394R(\u2113,\u03b3)>0.7, and with an additional dilepton invariant mass requirement of M_(\u2113\u2113)>50 GeV for the Z\u03b3 process. The following cross section times branching fraction values are found: \u03c3(pp \u2192 Wy + X) x B(W \u2192 \u2113v)= 56.3 \u00b1 5.0 (syst.) \u00b1 2.3 (lumi.) pb and \u03c3(pp \u2192 Zy + X) x B(Z \u2192 \u2113\u2113) = 9.4 \u00b1 1.0 (stat.)\u00b1 0.6(syst.) \u00b1 0.4(lumi.)pb. These measurements are in agreement with standard model predictions. The first limits on anomalous WW\u03b3, ZZ\u03b3, and Z\u03b3\u03b3 trilinear gauge couplings at \u221as = 7 TeV are set.", "doi": "10.1016/j.physletb.2011.06.034", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-07-27", "series_number": "5", "volume": "701", "issue": "5", "pages": "535-555" }, { "id": "authors:5vz5b-6c133", "collection": "authors", "collection_id": "5vz5b-6c133", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110802-070340398", "type": "article", "title": "Measurement of the Polarization of W Bosons with Large Transverse Momenta in W + jets Events at the LHC", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A first measurement of the polarization of W bosons with large transverse momenta in pp collisions is presented. The measurement is based on 36\u2009\u2009pb^(-1) of data recorded at \u221as=7\u2009\u2009TeV by the CMS detector at the LHC. The left-handed, right-handed, and longitudinal polarization fractions (f_L, f_R, and f_0, respectively) of W bosons with transverse momenta larger than 50 GeV are determined by using decays to both electrons and muons. The muon final state yields the most precise measurement: (f_L-f_R)-=0.240\u00b10.036(stat)\u00b10.031(syst) and f_0^-=0.183\u00b10.087(stat)\u00b10.123(syst) for negatively charged W bosons and (f_L-f_R)^+=0.310\u00b10.036(stat)\u00b10.017(syst) and f_0^+=0.171\u00b10.085(stat)\u00b10.099(syst) for positively charged W bosons. This establishes, for the first time, that W bosons produced in pp collisions with large transverse momenta are predominantly left-handed, as expected in the standard model.", "doi": "10.1103/PhysRevLett.107.021802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-07-06", "series_number": "2", "volume": "107", "issue": "2", "pages": "Art. No. 021802" }, { "id": "authors:sfgcp-pby64", "collection": "authors", "collection_id": "sfgcp-pby64", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110926-071911671", "type": "article", "title": "Search for a heavy bottom-like quark in pp collisions at\n \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Boos", "given_name": "E.", "clpid": "Boos-E" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair-produced bottom-like quarks in pp collisions at \u221as = 7 TeV is conducted with the CMS experiment at the LHC. The decay b\u2032\u2192tW is considered in this search. The b'b'\u2192 tW^-tW^+ process can be identified by the distinctive signature of trileptons and same-sign dileptons. With a data sample corresponding to an integrated luminosity of 34 pb^(\u22121), no excess above the standard model background predictions is observed and a b\u2032 quark with a mass between 255 and 361 GeV/c^2 is excluded at the 95% confidence level.", "doi": "10.1016/j.physletb.2011.05.074", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-07-04", "series_number": "2", "volume": "701", "issue": "2", "pages": "204-223" }, { "id": "authors:ca0se-ezp29", "collection": "authors", "collection_id": "ca0se-ezp29", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110923-112548894", "type": "article", "title": "Search for a W' boson decaying to a muon and a neutrino in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A new heavy gauge boson, W\u2032, decaying to a muon and a neutrino, is searched for in pp collisions at a centre-of-mass energy of 7 TeV. The data, collected with the CMS detector at the LHC, correspond to an integrated luminosity of 36 pb^(\u22121). No significant excess of events above the standard model expectation is found in the transverse mass distribution of the muon\u2013neutrino system. Masses below 1.40 TeV are excluded at the 95% confidence level for a sequential standard-model-like W\u2032. The W\u2032 mass lower limit increases to 1.58 TeV when the present analysis is combined with the CMS result for the electron channel", "doi": "10.1016/j.physletb.2011.05.048", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-07-04", "series_number": "2", "volume": "701", "issue": "2", "pages": "160-179" }, { "id": "authors:wns2j-tff55", "collection": "authors", "collection_id": "wns2j-tff55", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111011-105328130", "type": "article", "title": "Search for supersymmetry in events with b jets and missing transverse momentum at the LHC", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for supersymmetry is presented using a sample of events with b jets and missing transverse momentum. The search uses a data sample of proton-proton collisions at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 35 pb^(\u22121), collected with the CMS detector. A total of 0.33^(+0.43)_(\u22120.33) (stat.)\u2009\u00b1\u20090.13 (syst.) events is predicted, using control samples in the data, to arise from standard model processes, and one event is observed in the data. Upper limits are set at the 95% confidence level on the cross sections of benchmark supersymmetric models.", "doi": "10.1007/JHEP07(2011)113", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-07", "series_number": "7", "volume": "2011", "issue": "7", "pages": "Art. No. 113" }, { "id": "authors:skmb2-psc56", "collection": "authors", "collection_id": "skmb2-psc56", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111011-075812238", "type": "article", "title": "Measurement of the tt production cross section and the top quark mass in the dilepton channel in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The tt production cross section and top quark mass are measured in proton-proton collisions at \u221as=7 TeV in a data sample corresponding to an integrated luminosity of 36 pb^(\u22121) collected by the CMS experiment. The measurements are performed in events with two leptons (electrons or muons) in the final state. Results of the cross section measurement in events with and without b-quark identification are obtained and combined. The measured value is \u03c3_(tt)\u2009=\u2009168\u2009\u00b1\u200918 (stat.)\u2009\u00b1\u200914 (syst.)\u2009\u00b1\u20097 (lumi.) pb, consistent with predictions from the standard model. The top quark mass m_(top) is reconstructed with two different methods, a full kinematic analysis and a matrix weighting technique. The combination yields a measurement of m_(top)\u2009=\u2009175.5\u2009\u00b1\u20094.6 (stat.)\u2009\u00b1\u20094.6 (syst.) GeV/c^2.", "doi": "10.1007/JHEP07(2011)049", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-07", "series_number": "7", "volume": "2011", "issue": "7", "pages": "Art. No. 049" }, { "id": "authors:mm91s-b2809", "collection": "authors", "collection_id": "mm91s-b2809", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111011-113730773", "type": "article", "title": "Search for light resonances decaying into pairs of muons as a signal of new physics", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" } ], "abstract": "A search for groups of collimated muons is performed using a data sample collected by the CMS experiment at the LHC, at a centre-of-mass energy of 7TeV, and corresponding to an integrated luminosity of 35 pb^(\u22121). The analysis searches for production of new low-mass states decaying into pairs of muons and is designed to achieve high sensitivity to a broad range of models predicting leptonic jet signatures. With no excess observed over the background expectation, upper limits on the production cross section times branching fraction times acceptance are set, ranging from 0.1 to 0.5 pb at the 95% CL depending on event topology. In addition, the results are interpreted in several benchmark models in the context of supersymmetry with a new light dark sector exploring previously inaccessible parameter space.", "doi": "10.1007/JHEP07(2011)098", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-07", "series_number": "7", "volume": "2011", "issue": "7", "pages": "Art. No. 098" }, { "id": "authors:x7b6k-fcn29", "collection": "authors", "collection_id": "x7b6k-fcn29", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111011-133651833", "type": "article", "title": "Long-range and short-range dihadron angular correlations in central PbPb collisions at \u221asNN = 2.76 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "First measurements of dihadron correlationsfor charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76TeV over a broad range in relative pseudorapidity (\u2206\u03b7) and the full range of relative azimuthal angle (\u2206\u03d5). The data were collected with the CMS detector, at the LHC. A broadening of the away-side (\u2206\u03d5\u2009\u2248\u2009\u03c0) azimuthal correlation is observed at all \u2206\u03b7, as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in \u2206\u03b7 are observed for particles with similar \u03d5 values. This phenomenon, also known as the \"ridge\", persists up to at least |\u2206\u03b7|\u2009=\u20094. For particles with transverse momenta (pT) of2-4 GeV/c, the ridge is found to be most prominent when these particles are correlated with particles of pT\u2009=\u20092-6 GeV/c, and to be much reduced when paired with particles of pT\u2009=\u200910-12 GeV/c.", "doi": "10.1007/JHEP07(2011)076", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-07", "series_number": "7", "volume": "2011", "issue": "7", "pages": "Art. No. 076" }, { "id": "authors:74c2n-7tx05", "collection": "authors", "collection_id": "74c2n-7tx05", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110802-073345553", "type": "article", "title": "Measurement of the B^0 Production Cross Section in pp Collisions at \u221as=7\u2009\u2009TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the differential production cross sections d\u03c3/dp_T^B and d\u03c3/dy^B for B^0 mesons produced in pp collisions at \u221as=7\u2009\u2009TeV are presented. The data set used was collected by the CMS experiment at the LHC and corresponds to an integrated luminosity of 40\u2009\u2009pb^(-1). The production cross section is measured from B^0 meson decays reconstructed in the exclusive final state J/\u03c8K_S^0, with the subsequent decays J/\u03c8\u2192\u03bc^+\u03bc^- and K_S^0\u2192\u03c0^+\u03c0^-. The total cross section for p_T^B>5\u2009\u2009GeV and |y^B|<2.2 is measured to be 33.2\u00b12.5\u00b13.5\u2009\u2009\u03bcb, where the first uncertainty is statistical and the second is systematic.", "doi": "10.1103/PhysRevLett.106.252001", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-06-20", "series_number": "25", "volume": "106", "issue": "25", "pages": "Art. No. 252001" }, { "id": "authors:7gxfg-9h012", "collection": "authors", "collection_id": "7gxfg-9h012", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110706-102620999", "type": "article", "title": "Upsilon production cross section in pp collisions at \u221as 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The \u03a5(1S), \u03a5(2S), and \u03a5(3S) production cross sections in proton-proton collisions at \u221as=7\u2009\u2009TeV are measured using a data sample collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 3.1\u00b10.3\u2009\u2009pb^(-1). Integrated over the rapidity range |y|<2, we find the product of the \u03a5(1S) production cross section and branching fraction to dimuons to be \u03c3(pp\u2192\u03a5(1S)X)\u00b7B(\u03a5(1S)\u2192\u03bc+\u03bc-)=7.37\u00b10.13_(-0.42)^(+0.61)\u00b10.81\u2009\u2009nb, where the first uncertainty is statistical, the second is systematic, and the third is associated with the estimation of the integrated luminosity of the data sample. This cross section is obtained assuming unpolarized \u03a5(1S) production. With the assumption of fully transverse or fully longitudinal production polarization, the measured cross section changes by about 20%. We also report the measurement of the \u03a5(1S), \u03a5(2S), and \u03a5(3S) differential cross sections as a function of transverse momentum and rapidity.", "doi": "10.1103/PhysRevD.83.112004", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2011-06-15", "series_number": "11", "volume": "83", "issue": "11", "pages": "Art. No. 112004" }, { "id": "authors:pmdz6-vh636", "collection": "authors", "collection_id": "pmdz6-vh636", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111212-111353633", "type": "article", "title": "Measurement of the differential dijet production cross section in proton\u2013proton collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the double-differential inclusive dijet production cross section in proton\u2013proton collisions at \u221as = 7 TeV is presented as a function of the dijet invariant mass and jet rapidity. The data correspond to an integrated luminosity of 36 pb^(\u22121), recorded with the CMS detector at the LHC. The measurement covers the dijet mass range 0.2 TeV to 3.5 TeV and jet rapidities up to |y|=2.5. It is found to be in good agreement with next-to-leading-order QCD predictions.", "doi": "10.1016/j.physletb.2011.05.027", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-06-13", "series_number": "3-4", "volume": "700", "issue": "3-4", "pages": "187-206" }, { "id": "authors:affcv-6tf60", "collection": "authors", "collection_id": "affcv-6tf60", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110705-154739492", "type": "article", "title": "Search for Neutral Minimal Supersymmetric Standard Model Higgs Bosons Decaying to Tau Pairs in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for neutral minimal supersymmetric standard model (MSSM) Higgs bosons in pp collisions at the LHC at a center-of-mass energy of 7 TeV is presented. The results are based on a data sample corresponding to an integrated luminosity of 36\u2009\u2009pb^(-1) recorded by the CMS experiment. The search uses decays of the Higgs bosons to tau pairs. No excess is observed in the tau-pair invariant-mass spectrum. The resulting upper limits on the Higgs boson production cross section times branching fraction to tau pairs, as a function of the pseudoscalar Higgs boson mass, yield stringent new bounds in the MSSM parameter space.", "doi": "10.1103/PhysRevLett.106.231801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-06-08", "series_number": "23", "volume": "106", "issue": "23", "pages": "Art. No. 231801" }, { "id": "authors:2v481-22n47", "collection": "authors", "collection_id": "2v481-22n47", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110927-084104568", "type": "article", "title": "Search for new physics with same-sign isolated\n dilepton events with jets and missing transverse\n energy at the LHC", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Boos", "given_name": "E.", "clpid": "Boos-E" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The results of searches for new physics in events with two same-sign isolated leptons, hadronic jets, and missing transverse energy in the final state are presented. The searches use an integrated luminosity of 35 pb^(\u22121) of pp collision data at a centre-of-mass energy of 7 TeV collected by the CMS experiment at the LHC. The observed numbers of events agree with the standard model predictions, and no evidence for new physics is found. To facilitate the interpretation of our data in a broader range of new physics scenarios, information on our event selection, detector response, and efficiencies is provided.", "doi": "10.1007/JHEP06(2011)077", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-06", "series_number": "6", "volume": "2011", "issue": "6", "pages": "Art. No. 077" }, { "id": "authors:s2b4a-rhf59", "collection": "authors", "collection_id": "s2b4a-rhf59", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110927-102057509", "type": "article", "title": "Search for supersymmetry in events with a lepton, a photon, and large missing transverse energy in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Boos", "given_name": "E.", "clpid": "Boos-E" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is performed for an excess of events, over the standard model expectations, with a photon, a lepton, and large missing transverse energy in pp collisions at \u221as=7 TeV. Such events are expected in many new physics models, in particular a supersymmetric theory that is broken via a gauge-mediated mechanism, when the lightest charged and neutral gauginos are mass degenerate. The data sample used in this search corresponds to an integrated luminosity of 35 pb^(-1) collected with the CMS detector at the LHC. No evidence of such an excess above the standard model backgrounds, dominated by W production, is found. The results are presented as 95% confidence level upper limits on the cross section for a benchmark gauge-mediated scenario, and are then converted into exclusion limits on the squark, gluino, and wino masses.", "doi": "10.1007/JHEP06(2011)093", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-06", "series_number": "6", "volume": "2011", "issue": "6", "pages": "Art. No. 093" }, { "id": "authors:sd9s8-mt047", "collection": "authors", "collection_id": "sd9s8-mt047", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110920-154027028", "type": "article", "title": "Search for physics beyond the standard model in\n opposite-sign dilepton events in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search is presented for physics beyond the standard model (SM) in final states with opposite-sign isolated lepton pairs accompanied by hadronic jets and missing transverse energy. The search is performed using LHC data recorded with the CMS detector, corresponding to an integrated luminosity of 34 pb^(\u22121). No evidence for an event yield beyond SM expectations is found. An upper limit on the non-SM contribution to the signal region is deduced from the results. This limit is interpreted in the context of the constrained minimal supersymmetric model. Additional information is provided to allow testing the exclusion of specific models of physics beyond the SM.", "doi": "10.1007/JHEP06(2011)026", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-06", "series_number": "6", "volume": "2011", "issue": "6", "pages": "Art. No. 026" }, { "id": "authors:sgrdv-7z865", "collection": "authors", "collection_id": "sgrdv-7z865", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110620-105613064", "type": "article", "title": "Study of Z Boson Production in PbPb Collisions at \u221asNN = 2.76\n TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for Z bosons in the \u03bc^+\u03bc^- decay channel has been performed in PbPb collisions at \u221as_(NN)=2.76\u2009\u2009TeV with the CMS detector at the LHC, in a 7.2\u2009\u2009\u03bcb^(-1) data sample. The number of opposite-sign muon pairs observed in the 60\u2013120\u2009\u2009GeV/c^2 invariant mass range is 39, corresponding to a yield per unit of rapidity (y) and per minimum bias event of [33.8\u00b15.5(stat)\u00b14.4(syst)]\u00d710^(-8), in the |y|<2.0 range. Rapidity, transverse momentum, and centrality dependencies are also measured. The results agree with next-to-leading order QCD calculations, scaled by the number of incoherent nucleon-nucleon collisions.", "doi": "10.1103/PhysRevLett.106.212301", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-05-24", "series_number": "21", "volume": "106", "issue": "21", "pages": "Art. No. 212301" }, { "id": "authors:p0ncx-1ex28", "collection": "authors", "collection_id": "p0ncx-1ex28", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110621-081305527", "type": "article", "title": "Search for Supersymmetry in pp Collisions at \u221as = 7 Te V in Events with Two Photons and Missing Transverse Energy", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for supersymmetry in the context of general gauge-mediated breaking with the lightest neutralino as the next-to-lightest supersymmetric particle and the gravitino as the lightest is presented. The data sample corresponds to an integrated luminosity of 36\u2009\u2009pb^(-1) recorded by the CMS experiment at the LHC. The search is performed by using events containing two or more isolated photons, at least one hadronic jet, and significant missing transverse energy. No excess of events at high missing transverse energy is observed. Upper limits on the signal cross section for general gauge-mediated supersymmetry between 0.3 and 1.1 pb at the 95% confidence level are determined for a range of squark, gluino, and neutralino masses, excluding supersymmetry parameter space that was inaccessible to previous experiments.", "doi": "10.1103/PhysRevLett.106.211802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-05-24", "series_number": "21", "volume": "106", "issue": "21", "pages": "Art. No. 211802" }, { "id": "authors:gf3kb-a4a93", "collection": "authors", "collection_id": "gf3kb-a4a93", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110607-132151251", "type": "article", "title": "Measurement of Dijet Angular Distributions and Search for Quark Compositeness in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "Dijet angular distributions are measured over a wide range of dijet invariant masses in pp collisions at \u221as=7\u2009\u2009TeV, at the CERN LHC. The event sample, recorded with the CMS detector, corresponds to an integrated luminosity of 36\u2009\u2009pb^(-1). The data are found to be in good agreement with the predictions of perturbative QCD, and yield no evidence of quark compositeness. With a modified frequentist approach, a lower limit on the contact interaction scale for left-handed quarks of \u039b^+=5.6\u2009\u2009TeV (\u039b^-=6.7\u2009\u2009TeV) for destructive (constructive) interference is obtained at the 95% confidence level.", "doi": "10.1103/PhysRevLett.106.201804", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-05-18", "series_number": "20", "volume": "106", "issue": "20", "pages": "Art. No. 201804" }, { "id": "authors:g1gke-01s90", "collection": "authors", "collection_id": "g1gke-01s90", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110614-091608218", "type": "article", "title": "Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair production of first-generation scalar leptoquarks is performed in the final state containing two electrons and two jets using proton-proton collision data at \u221as=7\u2009\u2009TeV. The data sample used corresponds to an integrated luminosity of 33\u2009\u2009pb^(-1) collected with the CMS detector at the CERN LHC. The number of observed events is in good agreement with the predictions for the standard model background processes, and an upper limit is set on the leptoquark pair production cross section times \u03b2^2 as a function of the leptoquark mass, where \u03b2 is the branching fraction of the leptoquark decay to an electron and a quark. A 95% confidence level lower limit is set on the mass of a first-generation scalar leptoquark at 384 GeV for \u03b2=1, which is the most stringent direct limit to date.", "doi": "10.1103/PhysRevLett.106.201802", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-05-17", "series_number": "20", "volume": "106", "issue": "20", "pages": "Art. No. 201802" }, { "id": "authors:z0fwh-2my67", "collection": "authors", "collection_id": "z0fwh-2my67", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110614-083217251", "type": "article", "title": "Search for Pair Production of Second-Generation Scalar Leptoquarks in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for pair production of second-generation scalar leptoquarks in the final state with two muons and two jets is performed using proton-proton collision data at \u221as=7\u2009\u2009TeV collected by the CMS detector at the LHC. The data sample used corresponds to an integrated luminosity of 34\u2009\u2009pb^(-1). The number of observed events is in good agreement with the predictions from the standard model processes. An upper limit is set on the second-generation leptoquark cross section times \u03b2^2 as a function of the leptoquark mass, and leptoquarks with masses below 394 GeV are excluded at a 95% confidence level for \u03b2=1, where \u03b2 is the leptoquark branching fraction into a muon and a quark. These limits are the most stringent to date.", "doi": "10.1103/PhysRevLett.106.201803", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-05-17", "series_number": "20", "volume": "106", "issue": "20", "pages": "Art. No. 201803" }, { "id": "authors:f2b9c-2jp90", "collection": "authors", "collection_id": "f2b9c-2jp90", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110527-133539030", "type": "article", "title": "Measurement of W^+W^\u2212 production and search for the Higgs boson in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of W^+W^\u2212 production in pp collisions at \u221as = 7 TeV and a search for the Higgs boson are reported. The W^+W^\u2212 candidates are selected in events with two leptons, either electrons or muons. The measurement is performed using LHC data recorded with the CMS detector, corresponding to an integrated luminosity of 36 pb^(\u22121). The pp \u2192 W^+W^\u2212 cross section is measured to be 41.1\u00b115.3 (stat)\u00b15.8(syst)\u00b14.5(lumi)pb consistent with the standard model prediction. Limits on WW\u03b3 and WWZ anomalous triple gauge couplings are set. The search for the standard model Higgs boson in the W^+W^\u2212 decay mode does not reveal any evidence of excess above backgrounds. Limits are set on the production of the Higgs boson in the context of the standard model and in the presence of a sequential fourth family of fermions with high masses. In the latter context, a Higgs boson with mass between 144 and 207 GeV/c^2 is ruled out at 95% confidence level.", "doi": "10.1016/j.physletb.2011.03.056", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-05-02", "series_number": "1-2", "volume": "699", "issue": "1-2", "pages": "25-47" }, { "id": "authors:68e0p-vdn38", "collection": "authors", "collection_id": "68e0p-vdn38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110601-084434852", "type": "article", "title": "First measurement of hadronic event shapes in pp collisions at\n \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Hadronic event shapes have been measured in proton\u2013proton collisions at \u221as = 7 TeV source, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2 pb^(\u22121). Event-shape distributions, corrected for detector response, are compared with five models of QCD multijet production.", "doi": "10.1016/j.physletb.2011.03.060", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-05-02", "series_number": "1-2", "volume": "699", "issue": "1-2", "pages": "48-67" }, { "id": "authors:gpez0-20q06", "collection": "authors", "collection_id": "gpez0-20q06", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110725-094541831", "type": "article", "title": "Search for large extra dimensions in the diphoton final\n state at the Large Hadron Collider", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for large extra spatial dimensions via virtual-graviton exchange in the diphoton channel has been carried out with the CMS detector at the LHC. No excess of events above the standard model expectations is found using a data sample collected in proton-proton collisions at \u221as = 7 TeV and corresponding to an integrated luminosity of 36 pb^(\u22121). New lower limits on the effective Planck scale in the range of 1.6\u20132.3TeV at the 95% confidence level are set, providing the most restrictive bounds to date on models with more than two large extra dimensions.", "doi": "10.1007/JHEP05(2011)085", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-05", "series_number": "5", "volume": "2011", "issue": "5", "pages": "Art. No. 85" }, { "id": "authors:sgq9s-cbv09", "collection": "authors", "collection_id": "sgq9s-cbv09", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110725-111301870", "type": "article", "title": "Search for resonances in the dilepton mass distribution in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for narrow resonances at high mass in the dimuon and dielectron channels has been performed by the CMS experiment at the CERN LHC, using pp collision data recorded at \u221as=7 TeV. The event samples correspond to integrated luminosities of 40 pb^(\u22121) in the dimuon channel and 35 pb^(\u22121) in the dielectron channel. Heavy dilepton resonances are predicted in theoretical models with extra gauge bosons (Z\u2032) or as Kaluza-Klein graviton excitations (G_(KK)) in the Randall-Sundrum model. Upper limits on the inclusive cross section of Z\u2032(G_(KK)) \u2192 \u2113^+ \u2113^\u2212 relative to Z \u2192 \u2113^+ \u2113^\u2212 are presented. These limits exclude at 95% confidence level a Z\u2032 with standard-model-like couplings below 1140GeV, the superstring-inspired Z'_\u03c8 below 887 GeV, and, for values of the coupling parameter kM_(Pl) of 0.05 (0.1), Kaluza-Klein gravitons below 855 (1079) GeV.", "doi": "10.1007/JHEP05(2011)093", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-05", "series_number": "5", "volume": "2011", "issue": "5", "pages": "Art. No. 93" }, { "id": "authors:gcxcg-xc230", "collection": "authors", "collection_id": "gcxcg-xc230", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110718-114009360", "type": "article", "title": "Strange particle production in pp collisions at \u221as = 0.9 and 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The spectra of strange hadrons are measured in proton-proton collisions, recorded by the CMS experiment at the CERN LHC, at centre-of-mass energies of 0.9 and 7 TeV. The K^(0)_(S), \u039b, and \u039e \u035e particles and their antiparticles are reconstructed from their decay topologies and the production rates are measured as functions of rapidity and\ntransverse momentum, pT. The results are compared to other experiments and to predictions of the Pythia Monte Carlo program. The p_T distributions are found to differ\nsubstantially from the Pythia results and the production rates exceed the predictions by up to a factor of three.", "doi": "10.1007/JHEP05(2011)064", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-05", "series_number": "5", "volume": "2011", "issue": "5", "pages": "Art. No. 064" }, { "id": "authors:00dsw-jkm27", "collection": "authors", "collection_id": "00dsw-jkm27", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110719-100115363", "type": "article", "title": "Measurement of Bose-Einstein correlations in pp collisions at\n \u221as = 0.9 and 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Bose-Einstein correlations between identical particles are measured in samples\nof proton-proton collisions at 0.9 and 7TeV centre-of-mass energies, recorded by the CMS\nexperiment at the LHC. The signal is observed in the form of an enhancement of number of\npairs of same-sign charged particles with small relative momentum. The dependence of this\nenhancement on kinematic and topological features of the event is studied. Anticorrelations\nbetween same-sign charged particles are observed in the region of relative momenta higher\nthan those in the signal region.", "doi": "10.1007/JHEP05(2011)029", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-05", "series_number": "5", "volume": "2011", "issue": "5", "pages": "Art. No. 029" }, { "id": "authors:06g9s-d4d05", "collection": "authors", "collection_id": "06g9s-d4d05", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110512-100701780", "type": "article", "title": "Search for supersymmetry in pp collisions at 7 TeV in events with jets and missing transverse energy", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for supersymmetry with R-parity conservation in proton\u2013proton collisions at a centre-of-mass energy of 7 TeV is presented. The data correspond to an integrated luminosity of 35 pb^(\u22121) collected by the CMS experiment at the LHC. The search is performed in events with jets and significant missing transverse energy, characteristic of the decays of heavy, pair-produced squarks and gluinos. The primary background, from standard model multijet production, is reduced by several orders of magnitude to a\nnegligible level by the application of a set of robust kinematic requirements. With this selection, the data are consistent with the standard model backgrounds, namely tt(overbar), W + jet and Z + jet production, which are estimated from data control samples. Limits are set on the parameters of the constrained minimal supersymmetric extension of the standard model. These limits extend those set previously by\nexperiments at the Tevatron and LEP colliders.", "doi": "10.1016/j.physletb.2011.03.021", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-04-11", "series_number": "3", "volume": "698", "issue": "3", "pages": "196-218" }, { "id": "authors:178zg-jkx09", "collection": "authors", "collection_id": "178zg-jkx09", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110614-142817029", "type": "article", "title": "Measurement of the lepton charge asymmetry in\n inclusive W production in pp collisions at \u221as = 7TeV", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the lepton charge asymmetry in inclusive pp \u2192 WX production at \u221as = 7TeV is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of 36 pb^(\u22121). This high precision measurement of the lepton charge asymmetry, performed in both the W \u2192 e\u03bd and W \u2192 \u03bc\u03bd channels, provides new insights into parton distribution functions.", "doi": "10.1007/JHEP04(2011)050", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-04", "series_number": "4", "volume": "2011", "issue": "4", "pages": "Art. No. 50" }, { "id": "authors:ema0r-7xq23", "collection": "authors", "collection_id": "ema0r-7xq23", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110428-094707696", "type": "article", "title": "Search for a heavy gauge boson W\u2032 in the final state with an electron and large missing transverse energy in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for a heavy gauge boson W\u2032 has been conducted by the CMS experiment at the LHC in the decay channel with an electron and large transverse energy imbalance E^(miss)_T, using proton\u2013proton collision data corresponding to an integrated luminosity of 36 pb^(\u22121). No excess above standard model expectations is seen in the transverse mass distribution of the electron-E^(miss)_T system. Assuming standard-model-like couplings and decay branching fractions, a W\u2032 boson with a mass less than 1.36 TeV/c^2 is excluded at 95% confidence level.", "doi": "10.1016/j.physletb.2011.02.048", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-03-28", "series_number": "1", "volume": "698", "issue": "1", "pages": "21-39" }, { "id": "authors:4zv6e-3zw51", "collection": "authors", "collection_id": "4zv6e-3zw51", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110421-094239303", "type": "article", "title": "Dijet Azimuthal Decorrelations in pp Collisions at \u221as=7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of dijet azimuthal decorrelations in pp collisions at \u221as=7\u2009\u2009TeV using the CMS detector at the CERN LHC are presented. The analysis is based on an inclusive dijet event sample corresponding to an integrated luminosity of 2.9\u2009\u2009pb^(-1). The results are compared to predictions from perturbative QCD calculations and various Monte Carlo event generators. The dijet azimuthal distributions are found to be sensitive to initial-state gluon radiation.", "doi": "10.1103/PhysRevLett.106.122003", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-03-25", "series_number": "12", "volume": "106", "issue": "12", "pages": "Art. No. 122003" }, { "id": "authors:rn6tq-4zk14", "collection": "authors", "collection_id": "rn6tq-4zk14", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110428-094751768", "type": "article", "title": "Search for microscopic black hole signatures at the Large Hadron Collider", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for microscopic black hole production and decay in pp collisions at a center-of-mass energy of 7 TeV has been conducted by the CMS Collaboration at the LHC, using a data sample corresponding to an integrated luminosity of 35 pb^(\u22121). Events with large total transverse energy are analyzed for the presence of multiple high-energy jets, leptons, and photons, typical of a signal expected from a microscopic black hole. Good agreement with the standard model backgrounds, dominated by QCD multijet production,\nis observed for various final-state multiplicities and model-independent limits on new physics in these final states are set. Using simple semi-classical approximation, limits on the minimum black hole mass are derived as well, in the range 3.5\u20134.5 TeV. These are the first direct limits on black hole production at a particle accelerator.", "doi": "10.1016/j.physletb.2011.02.032", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-03-21", "series_number": "5", "volume": "697", "issue": "5", "pages": "434-453" }, { "id": "authors:r5knq-sbt69", "collection": "authors", "collection_id": "r5knq-sbt69", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110414-085358639", "type": "article", "title": "Measurement of the B^+ Production Cross Section in pp Collisions at \u221as=7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of the total and differential cross sections d\u03c3/dp_T^B and d\u03c3/dy^B for B^+ mesons produced in pp collisions at \u221as=7\u2009\u2009TeV are presented. The data correspond to an integrated luminosity of 5.8\u2009\u2009pb^(-1) collected by the CMS experiment operating at the LHC. The exclusive decay B^+\u2192J/\u03c8K^+, with J/\u03c8\u2192\u03bc^+\u03bc^-, is used to detect B^+ mesons and to measure the production cross section as a function of p_T^B and y^B. The total cross section for p_T^B>5\u2009\u2009GeV and |y^B|<2.4 is measured to be 28.1\u00b12.4\u00b12.0\u00b13.1\u2009\u2009\u03bcb, where the first uncertainty is statistical, the second is systematic, and the last is from the luminosity measurement.", "doi": "10.1103/PhysRevLett.106.112001", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-03-17", "series_number": "11", "volume": "106", "issue": "11", "pages": "Art. No. 112001" }, { "id": "authors:4mskq-mxf21", "collection": "authors", "collection_id": "4mskq-mxf21", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110713-092706071", "type": "article", "title": "Prompt and non-prompt J/\u03c8 production in pp collisions at \u221as =7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The production of J/\u03c8 mesons is studied in pp collisions at \u221as = 7 TeV with the CMS experiment at the LHC. The measurement is based on a dimuon sample corresponding to an integrated luminosity of 314 nb^(\u22121). The J/\u03c8 differential cross section is determined, as a function of the J/\u03c8 transverse momentum, in three rapidity ranges. A fit to the decay length distribution is used to separate the prompt from the non-prompt (b hadron to J/\u03c8) component. Integrated over J/\u03c8 transverse momentum from 6.5 to 30 GeV/c and over rapidity in the range |y|<2.4, the measured cross sections, times the dimuon decay branching fraction, are 70.9\u00b12.1(stat.)\u00b13.0(syst.)\u00b17.8(luminosity) nb for prompt J/\u03c8 mesons assuming unpolarized production and 26.0\u00b11.4(stat.)\u00b11.6(syst.)\u00b12.9(luminosity) nb for J/\u03c8 mesons from b-hadron decays.", "doi": "10.1140/epjc/s10052-011-1575-8", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2011-03", "series_number": "3", "volume": "71", "issue": "3", "pages": "Art. No. 1575" }, { "id": "authors:a625f-55634", "collection": "authors", "collection_id": "a625f-55634", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110601-113446151", "type": "article", "title": "Measurement of BB angular correlations based on secondary vertex reconstruction at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the angular correlations between beauty and anti-beauty hadrons (BB) produced in pp collisions at a centre-of-mass energy of 7 TeV at the CERN LHC is presented, probing for the first time the region of small angular separation. The B hadrons are identified by the presence of displaced secondary vertices from their decays. The B hadron angular separation is reconstructed from the decay vertices and the primary-interaction vertex. The differential BB production cross section, measured from a data sample collected by CMS and corresponding to an integrated luminosity of 3.1 pb^(\u22121), shows that a sizable fraction of the BB pairs are produced with small opening angles. These studies provide a test of QCD and further insight into the dynamics of bb production.", "doi": "10.1007/JHEP03(2011)136", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-03", "series_number": "3", "volume": "2011", "issue": "3", "pages": "Art. No. 136" }, { "id": "authors:e6h44-tyj50", "collection": "authors", "collection_id": "e6h44-tyj50", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110512-100735620", "type": "article", "title": "Search for heavy stable charged particles in pp collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The result of a search at the LHC for heavy stable charged particles produced in pp collisions at \u221as = 7 TeV is described. The data sample was collected with the CMS detector and corresponds to an integrated luminosity of 3.1 pb^(-1). Momentum and ionization-energy-loss measurements in the inner tracker detector are used to identify tracks compatible with heavy slow-moving particles. Additionally, tracks passing muon identication requirements are also analyzed for the same signature. In each case, no candidate\npasses the selection, with an expected background of less than 0:1 events. A lower limit at the 95% condence level on the mass of a stable gluino is set at 398 GeV/c^2, using\na conventional model of nuclear interactions that allows charged hadrons containing this particle to reach the muon detectors. A lower limit of 311 GeV/c^2 is also set for a\nstable gluino in a conservative scenario of complete charge suppression, where any hadron containing this particle becomes neutral before reaching the muon detectors.", "doi": "10.1007/JHEP03(2011)024", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-03", "series_number": "3", "volume": "2011", "issue": "3", "pages": "Art. No. 24" }, { "id": "authors:edhe6-0pc15", "collection": "authors", "collection_id": "edhe6-0pc15", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110602-080615352", "type": "article", "title": "Inclusive b-hadron production cross section with\n muons in pp collisions at \u221as = TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the b-hadron production cross section in proton-proton collisions at \u221as = 7 TeV is presented. The dataset, corresponding to 85 nb^(\u22121), was recorded with the CMS experiment at the LHC using a low-threshold single-muon trigger. Events are selected by the presence of a muon with transverse momentum p^\u00b5_T > GeV with respect to the beam direction and pseudorapidity |\u03b7 ^\u03bc | < 2.1. The transverse momentum of the muon with respect to the closest jet discriminates events containing b hadrons from background. The inclusive b-hadron production cross section is presented as a function of muon transverse momentum and pseudorapidity. The measured total cross section in the kinematic acceptance is \u03c3(pp \u2192 b + X \u2192 \u03bc + X\u2032) = 1.32 \u00b1 0.01(stat) \u00b1 0.30(syst) \u00b1 0.15(lumi)\u03bcb.", "doi": "10.1007/JHEP03(2011)090", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-03", "series_number": "3", "volume": "2011", "issue": "3", "pages": "Art. No. 090" }, { "id": "authors:4h6vd-8tm88", "collection": "authors", "collection_id": "4h6vd-8tm88", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110323-080919238", "type": "article", "title": "Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions at \u221as = 7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The differential cross section for the inclusive production of isolated prompt photons has been measured as a function of the photon transverse energy E_T^y in pp collisions at \u221as = 7 TeV using data recorded by the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.9 pb^(-1). Photons are required to have a pseudorapidity \u2502\u03b7^y\u2502 < 1.45 and E_T^y > 21 GeV, covering the kinematic region 0.006< X_T < 0.086. The measured cross section is found to be in agreement with next-to-leading-order perturbative QCD calculations.", "doi": "10.1103/PhysRevLett.106.082001", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-02-23", "series_number": "8", "volume": "106", "issue": "8", "pages": "Art. No. 082001" }, { "id": "authors:7g7xy-9mc60", "collection": "authors", "collection_id": "7g7xy-9mc60", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110310-111937091", "type": "article", "title": "First measurement of the cross section for top-quark pair production in proton-collission at \u221as=7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The first measurement of the cross section for top-quark pair production in pp collisions at the Large Hadron Collider at center-of-mass energy \u221as = 7 TeV has been performed using a data sample corresponding to an integrated luminosity of 3.1 \u00b1 0.3 pb^(\u22121) recorded by the CMS detector. This result utilizes the final state with two isolated, highly energetic charged leptons, large missing transverse energy, and two or more jets. Backgrounds from Drell\u2013Yan and non-W/Z boson production are estimated from data. Eleven events are observed in the data with 2.1 \u00b1 1.0 events expected from background. The measured cross section is 194\u00b172(stat.)\u00b124(syst.)\u00b121(lumi.) pb, consistent with next-to-leading order predictions.", "doi": "10.1016/j.physletb.2010.11.058", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2011-01-17", "series_number": "5", "volume": "695", "issue": "5", "pages": "424-443" }, { "id": "authors:1zcn9-w3x91", "collection": "authors", "collection_id": "1zcn9-w3x91", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110314-093625944", "type": "article", "title": "Search for Stopped Gluinos in pp Collisions at \u221as=7\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The results of the first search for long-lived gluinos produced in 7 TeV pp collisions at the CERN Large Hadron Collider are presented. The search looks for evidence of long-lived particles that stop in the CMS detector and decay in the quiescent periods between beam crossings. In a dataset with a peak instantaneous luminosity of 1 \u00d7 10^(32)\u2009\u2009cm^(-2)\u2009s^(-1), an integrated luminosity of 10\u2009\u2009pb^(-1), and a search interval corresponding to 62 hours of LHC operation, no significant excess above background was observed. Limits at the 95% confidence level on gluino pair production over 13 orders of magnitude of gluino lifetime are set. For a mass difference mg\u02dc - m\u03c7\u02dc_0^1>100\u2009\u2009GeV/c^2, and assuming BR(g\u02dc\u2192 g\u03c7\u02dc^0_1)=100%, mg\u02dc<370\u2009\u2009GeV/c^2 are excluded for lifetimes from 10\u2009\u2009\u03bcs to 1000 s.", "doi": "10.1103/PhysRevLett.106.011801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2011-01-07", "series_number": "1", "volume": "106", "issue": "1", "pages": "Art. No. 011801" }, { "id": "authors:3cj35-kgz58", "collection": "authors", "collection_id": "3cj35-kgz58", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110404-100248593", "type": "article", "title": "Measurements of inclusive W and Z cross sections in pp collisions at \u221as=7 TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of inclusive W and Z boson production cross sections in pp collisions at \u221as = 7 TeV are presented, based on 2.9 pb^(-1) of data recorded by the CMS detector at the LHC. The measurements, performed in the electron and muon decay channels, are combined to give \u03c3(pp \u2192 WX) x B (W \u2192 lv) = 9.95 \u00b1 0.07 (stat.) \u00b1 0.28 (syst.) \u00b1 1.09 (lumi.) nb and \u03c3(pp \u2192 ZX) x B (Z \u2192 \u2113+\u2113-) = 0.931 \u00b1 0.026 (stat.) \u00b1 0.023 (syst.) \u00b1 0.102 (lumi.) nb, where \u2113 stands for either e or \u00b5. Theoretical predictions, calculated at the next-to-next-to-leading order in QCD using recent parton distribution functions, are in agreement with the measured cross sections. Ratios of cross sections, which incur an experimental systematic uncertainty of less than 4%, are also reported.", "doi": "10.1007/JHEP01(2011)080", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-01", "series_number": "1", "volume": "2011", "issue": "1", "pages": "Art. No. 080" }, { "id": "authors:a399p-ry263", "collection": "authors", "collection_id": "a399p-ry263", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110329-153114607", "type": "article", "title": "Charged particle multiplicities in pp interactions at \u221as = 0.9, 2.36, and 7 TeV", "author": [ { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Measurements of primary charged hadron multiplicity distributions are presented for non-single-diractive events in proton-proton collisions at centre-of-mass energies\nof \u221as = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from |\u03b7| < 0.5 to |\u03b7| < 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distribution at \u221as = 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with \u221as is underestimated by most event generators. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the multiplicity distribution confirms the violation of\nKoba-Nielsen-Olesen scaling that has been observed at lower energies.", "doi": "10.1007/JHEP01(2011)079", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2011-01", "series_number": "1", "volume": "2011", "issue": "1", "pages": "Art. No. 79" }, { "id": "authors:rnqrr-5y876", "collection": "authors", "collection_id": "rnqrr-5y876", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120213-121753118", "type": "article", "title": "Community Seismic Network", "author": [ { "family_name": "Clayton", "given_name": "Robert W.", "orcid": "0000-0003-3323-3508", "clpid": "Clayton-R-W" }, { "family_name": "Heaton", "given_name": "Thomas H.", "orcid": "0000-0003-3363-2197", "clpid": "Heaton-T-H" }, { "family_name": "Chandy", "given_name": "Mani", "orcid": "0000-0001-9190-1290", "clpid": "Chandy-K-M" }, { "family_name": "Krause", "given_name": "R. Andreas", "orcid": "0000-0001-7260-9673", "clpid": "Krause-R-Andreas" }, { "family_name": "Kohler", "given_name": "Monica", "orcid": "0000-0002-4703-190X", "clpid": "Kohler-M-D" }, { "family_name": "Bunn", "given_name": "Julian", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Guy", "given_name": "Richard", "clpid": "Guy-R" }, { "family_name": "Olson", "given_name": "Michael", "clpid": "Olson-Michael-James" }, { "family_name": "Faulkner", "given_name": "Matthew", "clpid": "Faulkner-Matthew-Nicholas" }, { "family_name": "Cheng", "given_name": "MingHei", "clpid": "Cheng-Ming-Hei" }, { "family_name": "Strand", "given_name": "Leif", "clpid": "Strand-L" }, { "family_name": "Chandy", "given_name": "Rishi", "clpid": "Chandy-R" }, { "family_name": "Obenshain", "given_name": "Daniel", "clpid": "Obenshain-D" }, { "family_name": "Liu", "given_name": "Annie", "clpid": "Liu-Annie-Hsin-Wen" }, { "family_name": "Aivazis", "given_name": "Michael", "clpid": "Aivazis-M" } ], "abstract": "The article describes the design of the Community Seismic Network, which is a dense open seismic network based on low cost sensors. The inputs are from sensors hosted by volunteers from the community by direct connection to their personal computers, or through sensors built into mobile devices. The server is cloud-based for robustness and to dynamically handle the load of impulsive earthquake events. The main product of the network is a map of peak acceleration, delivered within seconds of the ground shaking. The lateral variations in the level of shaking will be valuable to first responders, and the waveform information from a dense network will allow detailed mapping of the rupture process. Sensors in buildings may be useful for monitoring the state-of-health of the structure after major shaking.", "doi": "10.4401/ag-5269", "issn": "1593-5213", "publisher": "Istituto Nazionale di Geofisica e Vulcanologia", "publication": "Annals of Geophysics", "publication_date": "2011", "series_number": "6", "volume": "54", "issue": "6", "pages": "738-747" }, { "id": "authors:e04tp-1m968", "collection": "authors", "collection_id": "e04tp-1m968", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110311-150041208", "type": "article", "title": "Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at \u221as = 7\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for quark compositeness in the form of quark contact interactions, based on hadronic jet pairs (dijets) produced in proton-proton collisions at \u221as = 7\u2009\u2009TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9\u2009\u2009pb^(-1) collected with the CMS detector at the LHC. The dijet centrality ratio, which quantifies the angular distribution of the dijets, is measured as a function of the invariant mass of the dijet system and is found to agree with the predictions of the standard model. A statistical analysis of the data provides a lower limit on the energy scale of quark contact interactions. The sensitivity of the analysis is such that the expected limit is 2.9 TeV; because the observed value of the centrality ratio at high invariant mass is below the expectation, the observed limit is 4.0 TeV at the 95% confidence level.", "doi": "10.1103/PhysRevLett.105.262001", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2010-12-31", "series_number": "26", "volume": "105", "issue": "26", "pages": "Art. No. 262001" }, { "id": "authors:k617y-pgg72", "collection": "authors", "collection_id": "k617y-pgg72", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110202-122209591", "type": "article", "title": "First measurement of the underlying event activity at the LHC with \u221as = 0.9 TeV", "author": [ { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A measurement of the underlying activity in scattering\nprocesses with p_T scale in the GeV region is performed in proton\u2013proton collisions at \u221as = 0.9 TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direction of a leading object, either a charged particle or a set of charged particles forming a jet. Predictions of several QCD inspired models as implemented in PYTHIA are compared, after full detector simulation, to the data. The models generally predict too little production of charged particles with pseudorapidity |\u03b7| < 2, p_T > 0.5 GeV/c, and azimuthal direction transverse to that of the leading object.", "doi": "10.1140/epjc/s10052-010-1453-9", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2010-12", "series_number": "3", "volume": "70", "issue": "3", "pages": "555-572" }, { "id": "authors:6hfdq-q0350", "collection": "authors", "collection_id": "6hfdq-q0350", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110202-122315030", "type": "article", "title": "CMS tracking performance results from early LHC operation", "author": [ { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "The first LHC pp collisions at centre-of-mass energies\nof 0.9 and 2.36 TeV were recorded by the CMS detector\nin December 2009. The trajectories of charged particles\nproduced in the collisions were reconstructed using the\nall-silicon Tracker and their momenta were measured in the\n3.8 T axial magnetic field. Results from the Tracker commissioning are presented including studies of timing, efficiency, signal-to-noise, resolution, and ionization energy. Reconstructed tracks are used to benchmark the performance in terms of track and vertex resolutions, reconstruction of decays, estimation of ionization energy loss, as well as identification of photon conversions, nuclear interactions, and heavy-flavour decays.", "doi": "10.1140/epjc/s10052-010-1491-3", "issn": "1434-6044", "publisher": "Springer", "publication": "European Physical Journal C", "publication_date": "2010-12", "series_number": "4", "volume": "70", "issue": "4", "pages": "1165-1192" }, { "id": "authors:9fhms-wp823", "collection": "authors", "collection_id": "9fhms-wp823", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110104-112531297", "type": "article", "title": "Search for Dijet Resonances in 7 TeV pp Collisions at CMS", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "literal": "CMS Collaboration" } ], "abstract": "A search for narrow resonances in the dijet mass spectrum is performed using data corresponding to an integrated luminosity of 2.9\u2009\u2009pb^(-1) collected by the CMS experiment at the Large Hadron Collider. Upper limits at the 95% confidence level are presented on the product of the resonance cross section, branching fraction into dijets, and acceptance, separately for decays into quark-quark, quark-gluon, or gluon-gluon pairs. The data exclude new particles predicted in the following models at the 95% confidence level: string resonances, with mass less than 2.50 TeV, excited quarks, with mass less than 1.58 TeV, and axigluons, colorons, and E_6 diquarks, in specific mass intervals. This extends previously published limits on these models.", "doi": "10.1103/PhysRevLett.105.211801", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2010-11-19", "series_number": "21", "volume": "105", "issue": "21", "pages": "211801" }, { "id": "authors:am2jq-7dk43", "collection": "authors", "collection_id": "am2jq-7dk43", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20101130-132602008", "type": "article", "title": "Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC", "author": [ { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chen", "given_name": "Y.", "orcid": "0000-0003-2582-6469", "clpid": "Chen-Yi" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Mott", "given_name": "A.", "clpid": "Mott-A" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Traczyk", "given_name": "P.", "clpid": "Traczyk-P" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Yong" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Results on two-particle angular correlations for charged particles emitted in\nproton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented,\nusing data collected with the CMS detector over a broad range of pseudorapidity (\u03b7) and\nazimuthal angle (\u00f8). Short-range correlations in \u0394\u03b7, which are studied in minimum bias\nevents, are characterized using a simple \"independent cluster\" parametrization in order to\nquantify their strength (cluster size) and their extent in \u03b7 (cluster decay width). Long-range\nazimuthal correlations are studied differentially as a function of charged particle multiplicity\nand particle transverse momentum using a 980 nb^(-1) data set at 7 TeV. In high multiplicity\nevents, a pronounced structure emerges in the two-dimensional correlation function for\nparticle pairs with intermediate p_T of 1-3 GeV/c, 2.0 < | \u0394\u03b7| < 4:8 and \u0394\u00f8 \u2248\n0. This is the first observation of such a long--range, near-side feature in two-particle correlation functions\nin pp or pp[overbar] collisions.", "doi": "10.1007/JHEP09(2010)091", "issn": "1126-6708", "publisher": "Springer", "publication": "Journal of High Energy Physics", "publication_date": "2010-09-27", "series_number": "9", "volume": "2010", "issue": "9", "pages": "Art. No. 091" }, { "id": "authors:t4deg-j0759", "collection": "authors", "collection_id": "t4deg-j0759", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20101022-150802478", "type": "article", "title": "Measurement of the charge ratio of atmospheric muons with the CMS detector", "author": [ { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "We present a measurement of the ratio of positive to negative muon fluxes from cosmic ray interactions\nin the atmosphere, using data collected by the CMS detector both at ground level and in the underground\nexperimental cavern at the CERN LHC. Muons were detected in the momentum range from 5 GeV/c to\n1 TeV/c. The surface flux ratio is measured to be 1.2766 \u00b1 0.0032 (stat.) \u00b1 0.0032 (syst.), independent\nof the muon momentum, below 100 GeV/c. This is the most precise measurement to date. At higher\nmomenta the data are consistent with an increase of the charge ratio, in agreement with cosmic ray\nshower models and compatible with previous measurements by deep-underground experiments.", "doi": "10.1016/j.physletb.2010.07.033", "issn": "0370-2693", "publisher": "Elsevier", "publication": "Physics Letters B", "publication_date": "2010-08-23", "series_number": "2", "volume": "692", "issue": "2", "pages": "83-104" }, { "id": "authors:7fps6-0nb02", "collection": "authors", "collection_id": "7fps6-0nb02", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100804-111402576", "type": "article", "title": "First Measurement of Bose-Einstein Correlations in Proton-Proton Collisions at \u221as=0.9 and 2.36 TeV at the LHC", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Bose-Einstein correlations have been measured using samples of proton-proton collisions at 0.9 and 2.36 TeV center-of-mass energies, recorded by the CMS experiment at the CERN Large Hadron Collider. The signal is observed in the form of an enhancement of pairs of same-sign charged particles with small relative four-momentum. The size of the correlated particle emission region is seen to increase significantly with the particle multiplicity of the event.", "doi": "10.1103/PhysRevLett.105.032001", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2010-07-13", "series_number": "3", "volume": "105", "issue": "3", "pages": "Art. No. 032001" }, { "id": "authors:eszgj-54477", "collection": "authors", "collection_id": "eszgj-54477", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100811-133906028", "type": "article", "title": "Transverse-Momentum and Pseudorapidity Distributions of Charged Hadrons in pp Collisions at \u221as=7\u2009\u2009TeV", "author": [ { "family_name": "Khachatryan", "given_name": "V.", "clpid": "Khachatryan-V" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Shin", "given_name": "K.", "clpid": "Shin-K" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at \u221as=7\u2009\u2009TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dN_(ch)/d\u03b7||\u03b7|<0.5=5.78\u00b10.01(stat)\u00b10.23(syst) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from \u221as=0.9 to 7 TeV is [66.1\u00b11.0(stat)\u00b14.2(syst)]%. The mean transverse momentum is measured to be 0.545\u00b10.005(stat)\u00b10.015(syst)\u2009\u2009GeV/c. The results are compared with similar measurements at lower energies.", "doi": "10.1103/PhysRevLett.105.022002", "issn": "0031-9007", "publisher": "American Physical Society", "publication": "Physical Review Letters", "publication_date": "2010-07-06", "series_number": "2", "volume": "105", "issue": "2", "pages": "Art. No. 022002" }, { "id": "authors:607b3-dmn93", "collection": "authors", "collection_id": "607b3-dmn93", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110127-133020555", "type": "article", "title": "Time reconstruction and performance of the CMS electromagnetic calorimeter", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The resolution and the linearity of time measurements made with the CMS electromagnetic calorimeter are studied with samples of data from test beam electrons, cosmic rays, and beam-produced muons. The resulting time resolution measured by lead tungstate crystals is better than 100 ps for energy deposits larger than 10 GeV. Crystal-to-crystal synchronization with a precision of 500 ps is performed using muons produced with the first LHC beams in 2008.", "doi": "10.1088/1748-0221/5/03/T03011", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03-19", "volume": "5", "pages": "T03011" }, { "id": "authors:6dhcw-8xx23", "collection": "authors", "collection_id": "6dhcw-8xx23", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110128-114011505", "type": "article", "title": "Commissioning and performance of the CMS silicon strip tracker with cosmic ray muons", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "orcid": "0000-0002-0898-787X", "clpid": "Zhang-Liyuan" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "During autumn 2008, the Silicon Strip Tracker was operated with the full CMS experiment in a comprehensive test, in the presence of the 3.8 T magnetic field produced by the CMS superconducting solenoid. Cosmic ray muons were detected in the muon chambers and used to trigger the readout of all CMS sub-detectors. About 15 million events with a muon in the tracker were collected. The efficiency of hit and track reconstruction were measured to be higher than 99% and consistent with expectations from Monte Carlo simulation. This article details the commissioning and performance of the Silicon Strip Tracker with cosmic ray muons.", "doi": "10.1088/1748-0221/5/03/T03008", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03-19", "volume": "5", "pages": "T03008" }, { "id": "authors:25bzy-nsp70", "collection": "authors", "collection_id": "25bzy-nsp70", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110126-155907276", "type": "article", "title": "Performance of CMS hadron calorimeter timing and\n synchronization using test beam, cosmic ray, and\n LHC beam data", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "orcid": "0000-0002-0898-787X", "clpid": "Zhang-Liyuan" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper discusses the design and performance of the time measurement technique and of the synchronization systems of the CMS hadron calorimeter. Time measurement performance results are presented from test beam data taken in the years 2004 and 2006. For hadronic showers of energy greater than 100 GeV, the timing resolution is measured to be about 1.2 ns. Time synchronization and out-of-time background rejection results are presented from the Cosmic Run At Four Tesla and LHC beam runs taken in the Autumn of 2008. The inter-channel synchronization is measured to be within \u00b12 ns.", "doi": "10.1088/1748-0221/5/03/T03013", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03-19", "volume": "5", "pages": "Art. No. T03013" }, { "id": "authors:ws7bg-52c60", "collection": "authors", "collection_id": "ws7bg-52c60", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110127-133059591", "type": "article", "title": "Performance and operation of the CMS electromagnetic calorimeter", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "orcid": "0000-0002-0898-787X", "clpid": "Zhang-Liyuan" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The operation and general performance of the CMS electromagnetic calorimeter using cosmic-ray muons are described. These muons were recorded after the closure of the CMS detector in late 2008. The calorimeter is made of lead tungstate crystals and the overall status of the 75 848 channels corresponding to the barrel and endcap detectors is reported. The stability of crucial operational parameters, such as high voltage, temperature and electronic noise, is summarised and the performance of the light monitoring system is presented.", "doi": "10.1088/1748-0221/5/03/T03010", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03-19", "volume": "5", "pages": "T03010" }, { "id": "authors:gr2kq-cgt66", "collection": "authors", "collection_id": "gr2kq-cgt66", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110128-114034073", "type": "article", "title": "Commissioning of the CMS High-Level Trigger with\n cosmic rays", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "orcid": "0000-0002-0898-787X", "clpid": "Zhang-Liyuan" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS High-Level Trigger (HLT) is responsible for ensuring that data samples with potentially interesting events are recorded with high efficiency and good quality. This paper gives an overview of the HLT and focuses on its commissioning using cosmic rays. The selection of triggers that were deployed is presented and the online grouping of triggered events into streams and primary datasets is discussed. Tools for online and offline data quality monitoring for the HLT are described, and the operational performance of the muon HLT algorithms is reviewed. The average time taken for the HLT selection and its dependence on detector and operating conditions are presented. The HLT performed reliably and helped provide a large dataset. This dataset has proven to be invaluable for understanding the performance of the trigger and the CMS experiment as a whole.", "doi": "10.1088/1748-0221/5/03/T03005", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03-19", "volume": "5", "pages": "T03005" }, { "id": "authors:3c8td-85j80", "collection": "authors", "collection_id": "3c8td-85j80", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110126-155959904", "type": "article", "title": "Performance of the CMS hadron calorimeter with cosmic ray muons and LHC beam data", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "orcid": "0000-0002-0898-787X", "clpid": "Zhang-Liyuan" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also performed during the few days of beam in the LHC in September 2008. Calibration parameters were extracted, and the energy response of the HCAL determined from test beam data has been checked.", "doi": "10.1088/1748-0221/5/03/T03012", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03-19", "volume": "5", "pages": "Art. No. T03012" }, { "id": "authors:q7wmn-z8w82", "collection": "authors", "collection_id": "q7wmn-z8w82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110125-122231561", "type": "article", "title": "Precise mapping of the magnetic field in the CMS barrel yoke using cosmic rays", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuk", "given_name": "V.", "clpid": "Timciuk-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "orcid": "0000-0002-0898-787X", "clpid": "Zhang-Liyuan" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS detector is designed around a large 4 T superconducting solenoid, enclosed in a 12 000-tonne steel return yoke. A detailed map of the magnetic field is required for the accurate simulation and reconstruction of physics events in the CMS detector, not only in the inner tracking region inside the solenoid but also in the large and complex structure of the steel yoke, which is instrumented with muon chambers. Using a large sample of cosmic muon events collected by CMS in 2008, the field in the steel of the barrel yoke has been determined with a precision of 3 to 8% depending on the location.", "doi": "10.1088/1748-0221/5/03/T03021", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03-19", "volume": "5", "pages": "Art. No. T03021" }, { "id": "authors:7y62t-25966", "collection": "authors", "collection_id": "7y62t-25966", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110127-133134370", "type": "article", "title": "Alignment of the CMS silicon tracker during commissioning with cosmic rays", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "orcid": "0000-0001-7192-4874", "clpid": "Ma-Yiqiu" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "orcid": "0000-0002-0898-787X", "clpid": "Zhang-Liyuan" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS silicon tracker, consisting of 1440 silicon pixel and 15 148 silicon strip detector modules, has been aligned using more than three million cosmic ray charged particles, with additional information from optical surveys. The positions of the modules were determined with respect to cosmic ray trajectories to an average precision of 3\u20134 microns RMS in the barrel and 3\u201314 microns RMS in the endcap in the most sensitive coordinate. The results have been validated by several studies, including laser beam cross-checks, track fit self-consistency, track residuals in overlapping module regions, and track parameter resolution, and are compared with predictions obtained from simulation. Correlated systematic effects have been investigated. The track parameter resolutions obtained with this alignment are close to the design performance.", "doi": "10.1088/1748-0221/5/03/T03009", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03-19", "volume": "5", "pages": "T03009" }, { "id": "authors:ypnnv-gf643", "collection": "authors", "collection_id": "ypnnv-gf643", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110131-132113523", "type": "article", "title": "Aligning the CMS muon chambers with the muon\n alignment system during an extended cosmic ray run", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The alignment system for the muon spectrometer of the CMS detector comprises three\nindependent subsystems of optical and analog position sensors. It aligns muon chambers with respect\nto each other and to the central silicon tracker. System commissioning at full magnetic field\nbegan in 2008 during an extended cosmic ray run. The system succeeded in tracking muon detector\nmovements of up to 18mm and rotations of several milliradians under magnetic forces. Depending\non coordinate and subsystem, the system achieved chamber alignment precisions of 140\u2013350 \u00b5m\nand 30\u2013200 \u00b5rad, close to the precision requirements of the experiment. Systematic errors on\nabsolute positions are estimated to be 340\u2013590 \u00b5m based on comparisons with independent photogrammetry\nmeasurements.", "doi": "10.1088/1748-0221/5/03/T03019", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03019" }, { "id": "authors:69238-dc708", "collection": "authors", "collection_id": "69238-dc708", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110418-113351341", "type": "article", "title": "CMS data processing workflows during an extended cosmic ray run", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS Collaboration conducted a month-long data taking exercise, the Cosmic Run At Four Tesla, during October-November 2008, with the goal of commissioning the experiment for extended operation. With all installed detector systems participating, CMS recorded 270 million\ncosmic ray events with the solenoid at a magnetic field strength of 3.8 T. This paper describes the data flow from the detector through the various online and offline computing systems, as well as the workflows used for recording the data, for aligning and calibrating the detector, and for analysis of the data.", "doi": "10.1088/1748-0221/5/03/T03006", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03006" }, { "id": "authors:5yt3g-g6814", "collection": "authors", "collection_id": "5yt3g-g6814", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110126-100159558", "type": "article", "title": "Measurement of the muon stopping power in lead tungstate", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "A large sample of cosmic ray events collected by the CMS detector is exploited to measure the specific energy loss of muons in the lead tungstate (PbWO_4) of the electromagnetic calorimeter. The measurement spans a momentum range from 5 GeV/c to 1 TeV/c. The results are consistent with the expectations over the entire range. The calorimeter energy scale, set with 120 GeV/c electrons, is validated down to the sub-GeV region using energy deposits, of order 100 MeV, associated with low-momentum muons. The muon critical energy in PbWO_4 is measured to be 160^(+5)_(\u22126)\u00b18 GeV, in agreement with expectations. This is the first experimental determination of muon critical energy.", "doi": "10.1088/1748-0221/5/03/P03007", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. P03007" }, { "id": "authors:mt8q1-dfy56", "collection": "authors", "collection_id": "mt8q1-dfy56", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110127-095318050", "type": "article", "title": "Performance of the CMS drift-tube chamber local trigger with cosmic rays", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The performance of the Local Trigger based on the drift-tube system of the CMS experiment has been studied using muons from cosmic ray events collected during the commissioning of the detector in 2008. The properties of the system are extensively tested and compared with the simulation. The effect of the random arrival time of the cosmic rays on the trigger performance is reported, and the results are compared with the design expectations for proton-proton collisions and with previous measurements obtained with muon beams.", "doi": "10.1088/1748-0221/5/03/T03003", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03003" }, { "id": "authors:xfjc3-asj12", "collection": "authors", "collection_id": "xfjc3-asj12", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110125-122153108", "type": "article", "title": "Performance of CMS muon reconstruction in cosmic-ray events", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The performance of muon reconstruction in CMS is evaluated using a large data sample of cosmic-ray muons recorded in 2008. Efficiencies of various high-level trigger, identification, and reconstruction algorithms have been measured for a broad range of muon momenta, and were found to be in good agreement with expectations from Monte Carlo simulation. The relative momentum resolution for muons crossing the barrel part of the detector is better than 1% at 10 GeV/c and is about 8% at 500 GeV/c, the latter being only a factor of two worse than expected with ideal alignment conditions. Muon charge misassignment ranges from less than 0.01% at 10 GeV/c to about 1% at 500 GeV/c.", "doi": "10.1088/1748-0221/5/03/T03022", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03022" }, { "id": "authors:tyjht-eq730", "collection": "authors", "collection_id": "tyjht-eq730", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110127-130246454", "type": "article", "title": "Fine synchronization of the CMS muon drift-tube\n local trigger using cosmic rays", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS experiment uses self-triggering arrays of drift tubes in the barrel muon trigger to perform the identification of the correct bunch crossing. The identification is unique only if the trigger chain is correctly synchronized. In this paper, the synchronization performed during an extended cosmic ray run is described and the results are reported. The random arrival time of cosmic ray muons allowed several synchronization aspects to be studied and a simple method for the fine synchronization of the Drift Tube Local Trigger at LHC to be developed.", "doi": "10.1088/1748-0221/5/03/T03004", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03004" }, { "id": "authors:sashv-y2160", "collection": "authors", "collection_id": "sashv-y2160", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110127-085458252", "type": "article", "title": "Performance of the CMS Level-1 trigger during commissioning with cosmic ray muons and LHC beams", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS Level-1 trigger was used to select cosmic ray muons and LHC beam events during data-taking runs in 2008, and to estimate the level of detector noise. This paper describes the trigger components used, the algorithms that were executed, and the trigger synchronisation. Using data from extended cosmic ray runs, the muon, electron/photon, and jet triggers have been validated, and their performance evaluated. Efficiencies were found to be high, resolutions were found to be good, and rates as expected.", "doi": "10.1088/1748-0221/5/03/T03002", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03002" }, { "id": "authors:ryqm1-np386", "collection": "authors", "collection_id": "ryqm1-np386", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110131-125932475", "type": "article", "title": "Performance of the CMS cathode strip chambers with\n cosmic rays", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "C.", "clpid": "Wilkinson-C" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The Cathode Strip Chambers (CSCs) constitute the primary muon tracking device in\nthe CMS endcaps. Their performance has been evaluated using data taken during a cosmic ray\nrun in fall 2008. Measured noise levels are low, with the number of noisy channels well below\n1%. Coordinate resolution was measured for all types of chambers, and fall in the range 47 \u00b5m to\n243 \u00b5m. The efficiencies for local charged track triggers, for hit and for segments reconstruction\nwere measured, and are above 99%. The timing resolution per layer is approximately 5 ns.", "doi": "10.1088/1748-0221/5/03/T03018", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03018" }, { "id": "authors:fxysa-0wc21", "collection": "authors", "collection_id": "fxysa-0wc21", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110126-140647636", "type": "article", "title": "Commissioning of the CMS experiment and the cosmic run at four tesla", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS Collaboration conducted a month-long data-taking exercise known as the\nCosmic Run At Four Tesla in late 2008 in order to complete the commissioning of the experiment\nfor extended operation. The operational lessons resulting from this exercise were addressed in the\nsubsequent shutdown to better prepare CMS for LHC beams in 2009. The cosmic data collected\nhave been invaluable to study the performance of the detectors, to commission the alignment and\ncalibration techniques, and to make several cosmic ray measurements. The experimental setup,\nconditions, and principal achievements from this data-taking exercise are described along with a\nreview of the preceding integration activities.", "doi": "10.1088/1748-0221/5/03/T03001", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03001" }, { "id": "authors:8c0e0-ng677", "collection": "authors", "collection_id": "8c0e0-ng677", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110126-093237097", "type": "article", "title": "Identification and filtering of uncharacteristic noise in the CMS hadron calorimeter", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Commissioning studies of the CMS hadron calorimeter have identified sporadic uncharacteristic noise and a small number of malfunctioning calorimeter channels. Algorithms have been developed to identify and address these problems in the data. The methods have been tested on cosmic ray muon data, calorimeter noise data, and single beam data collected with CMS in 2008. The noise rejection algorithms can be applied to LHC collision data at the trigger level or in the offline analysis. The application of the algorithms at the trigger level is shown to remove 90% of noise events with fake missing transverse energy above 100 GeV, which is sufficient for the CMS physics trigger operation.", "doi": "10.1088/1748-0221/5/03/T03014", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03014" }, { "id": "authors:544nt-86112", "collection": "authors", "collection_id": "544nt-86112", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110131-105535573", "type": "article", "title": "Performance study of the CMS barrel resistive plate\n chambers with cosmic rays", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "In October and November 2008, the CMS collaboration conducted a programme of\ncosmic ray data taking, which has recorded about 270 million events. The Resistive Plate Chamber\nsystem, which is part of the CMS muon detection system, was successfully operated in the full\nbarrel. More than 98% of the channels were operational during the exercise with typical detection\nefficiency of 90%. In this paper, the performance of the detector during these dedicated runs is\nreported.", "doi": "10.1088/1748-0221/5/03/T03017", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03017" }, { "id": "authors:pz5xx-wyg95", "collection": "authors", "collection_id": "pz5xx-wyg95", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110420-110716571", "type": "article", "title": "Commissioning and performance of the CMS pixel tracker with cosmic ray muons", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Dubinin", "given_name": "M.", "clpid": "Dubinin-M" }, { "family_name": "Spiropulu", "given_name": "M.", "orcid": "0000-0001-8172-7081", "clpid": "Spiropulu-M" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The pixel detector of the Compact Muon Solenoid experiment consists of three barrel layers and two disks for each endcap. The detector was installed in summer 2008, commissioned with charge injections, and operated in the 3.8 T magnetic field during cosmic ray data taking. This\npaper reports on the first running experience and presents results on the pixel tracker performance, which are found to be in line with the design specifications of this detector. The transverse impact parameter resolution measured in a sample of high momentum muons is 18 microns.", "doi": "10.1088/1748-0221/5/03/T03007", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03007" }, { "id": "authors:8gb2b-68n24", "collection": "authors", "collection_id": "8gb2b-68n24", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110420-101435471", "type": "article", "title": "Calibration of the CMS drift tube chambers and\n measurement of the drift velocity with cosmic rays", "author": [ { "family_name": "Chatrchyan", "given_name": "S.", "clpid": "Chatrchyan-S" }, { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "This paper describes the calibration procedure for the drift tubes of the CMS barrel muon system and reports the main results obtained with data collected during a high statistics cosmic ray data-taking period. The main goal of the calibration is to determine, for each drift cell, the minimum time delay for signals relative to the trigger, accounting for the drift velocity within the cell. The accuracy of the calibration procedure is influenced by the random arrival time of the cosmic muons relative to the LHC clock cycle. A more refined analysis of the drift velocity was performed during the offline reconstruction phase, which takes into account this feature of cosmic ray events.", "doi": "10.1088/1748-0221/5/03/T03016", "issn": "1748-0221", "publisher": "International School of Advanced Studies", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03016" }, { "id": "authors:h9668-r0v39", "collection": "authors", "collection_id": "h9668-r0v39", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110131-095919760", "type": "article", "title": "Performance of the CMS drift tube chambers with\n cosmic rays", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "Studies of the performance of the CMS drift tube barrel muon system are described,\nwith results based on data collected during the CMS Cosmic Run at Four Tesla. For most of these\ndata, the solenoidal magnet was operated with a central field of 3.8 T. The analysis of data from\n246 out of a total of 250 chambers indicates a very good muon reconstruction capability, with a\ncoordinate resolution for a single hit of about 260 mm, and a nearly 100% efficiency for the drift\ntube cells. The resolution of the track direction measured in the bending plane is about 1:8 mrad,\nand the efficiency to reconstruct a segment in a single chamber is higher than 99%. The CMS\nsimulation of cosmic rays reproduces well the performance of the barrel muon detector.", "doi": "10.1088/1748-0221/5/03/T03015", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03015" }, { "id": "authors:wahr3-3ct88", "collection": "authors", "collection_id": "wahr3-3ct88", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110131-160827183", "type": "article", "title": "Alignment of the CMS muon system with cosmic-ray\n and beam-halo muons", "author": [ { "family_name": "Apresyan", "given_name": "A.", "orcid": "0000-0002-6186-0130", "clpid": "Apresyan-A" }, { "family_name": "Bornheim", "given_name": "A.", "orcid": "0000-0002-0128-0871", "clpid": "Bornheim-A" }, { "family_name": "Bunn", "given_name": "J.", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Chiorboli", "given_name": "M.", "clpid": "Chiorboli-M" }, { "family_name": "Gataullin", "given_name": "M.", "clpid": "Gataullin-M" }, { "family_name": "Kcira", "given_name": "D.", "orcid": "0000-0002-8190-2414", "clpid": "Kcira-D" }, { "family_name": "Litvine", "given_name": "V.", "clpid": "Litvine-V" }, { "family_name": "Ma", "given_name": "Y.", "clpid": "Ma-Y" }, { "family_name": "Newman", "given_name": "H. B.", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Rogan", "given_name": "C.", "orcid": "0000-0002-4166-4503", "clpid": "Rogan-C" }, { "family_name": "Timciuc", "given_name": "V.", "clpid": "Timciuc-V" }, { "family_name": "Veverka", "given_name": "J.", "clpid": "Veverka-J" }, { "family_name": "Wilkinson", "given_name": "R.", "clpid": "Wilkinson-R" }, { "family_name": "Yang", "given_name": "Y.", "clpid": "Yang-Y" }, { "family_name": "Zhang", "given_name": "L.", "clpid": "Zhang-L" }, { "family_name": "Zhu", "given_name": "K.", "clpid": "Zhu-K" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "CMS Collaboration" } ], "abstract": "The CMS muon system has been aligned using cosmic-ray muons collected in 2008\nand beam-halo muons from the 2008 LHC circulating beam tests. After alignment, the resolution\nof the most sensitive coordinate is 80 microns for the relative positions of superlayers in the same\nbarrel chamber and 270 microns for the relative positions of endcap chambers in the same ring\nstructure. The resolution on the position of the central barrel chambers relative to the tracker is\ncomprised between two extreme estimates, 200 and 700 microns, provided by two complementary\nstudies. With minor modifications, the alignment procedures can be applied using muons from\nLHC collisions, leading to additional significant improvements.", "doi": "10.1088/1748-0221/5/03/T03020", "issn": "1748-0221", "publisher": "IOP", "publication": "Journal of Instrumentation", "publication_date": "2010-03", "volume": "5", "pages": "Art. No. T03020" }, { "id": "authors:w8fm4-xwm05", "collection": "authors", "collection_id": "w8fm4-xwm05", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:JINieeen05", "type": "article", "title": "FAST TCP: from theory to experiments", "author": [ { "family_name": "Jin", "given_name": "Cheng", "clpid": "Jin-Cheng" }, { "family_name": "Wei", "given_name": "David X.", "clpid": "Wei-Xiaoliang-David" }, { "family_name": "Low", "given_name": "Steven H.", "orcid": "0000-0001-6476-3048", "clpid": "Low-S-H" }, { "family_name": "Bunn", "given_name": "Julian", "orcid": "0000-0002-3798-298X", "clpid": "Bunn-J" }, { "family_name": "Choe", "given_name": "Hyojeong D.", "clpid": "Choe-Hyojeong-D" }, { "family_name": "Doyle", "given_name": "John C.", "orcid": "0000-0002-1828-2486", "clpid": "Doyle-J-C" }, { "family_name": "Newman", "given_name": "Harvey", "orcid": "0000-0003-0964-1480", "clpid": "Newman-H-B" }, { "family_name": "Ravot", "given_name": "Sylvain", "clpid": "Ravot-Sylvain" }, { "family_name": "Singh", "given_name": "Suresh", "clpid": "Singh-Suresh" }, { "family_name": "Paganini", "given_name": "Fernando", "clpid": "Paganini-Fernando" }, { "family_name": "Buhrmaster", "given_name": "Gary", "clpid": "Buhrmaster-Gary" }, { "family_name": "Cottrell", "given_name": "Les", "clpid": "Cottrell-R-L-A" }, { "family_name": "Martin", "given_name": "Oliver", "clpid": "Martin-Oliver" }, { "family_name": "Feng", "given_name": "Wu-chun", "clpid": "Feng-Wu-chun" } ], "abstract": "We describe a variant of TCP, called FAST, that can sustain high throughput and utilization at multigigabits per second over large distances. We present the motivation, review the background theory, summarize key features of FAST TCP, and report our first experimental results.", "doi": "10.1109/MNET.2005.1383434", "issn": "0890-8044", "publisher": "IEEE Network", "publication": "IEEE Network", "publication_date": "2005-01", "series_number": "1", "volume": "19", "issue": "1", "pages": "4-11" } ]