[ { "id": "https://authors.library.caltech.edu/records/jmbf2-qjq77", "eprint_id": 37000, "eprint_status": "archive", "datestamp": "2023-08-19 12:55:27", "lastmod": "2026-03-18 03:36:19", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lee-Lisa", "name": { "family": "Lee", "given": "Lisa" } }, { "id": "Spiropulu-M", "name": { "family": "Spiropulu", "given": "M." }, "orcid": "0000-0001-8172-7081" }, { "id": "Chen-Yi", "name": { "family": "Chen", "given": "Y." }, "orcid": "0000-0003-2582-6469" }, { "id": "Apresyan-A", "name": { "family": "Apresyan", "given": "A." }, "orcid": "0000-0002-6186-0130" } ] }, "title": "Study of the HCAL Fit-Based Noise Filters in 2012 Data", "ispublished": "unpub", "full_text_status": "public", "keywords": "Compact Muon Solenoid", "note": "I would like to thank Artur Apresyan and Yi Chen for their support and guidance, as well as all those in the Caltech CMS group, specifically Alex Mott for his help. I would also like to express a special gratitude to Professor Maria Spiropulu. The work presented in this note was partially funded by the Musk Foundation.", "abstract": "Performance of the fit-based filters for anomalous background signals for the 2012 collision data needs to be studied and validated. These filters typically use the pulse shape to separate signal from anomalous signals. The higher pileup conditions at the Large Hadron Collider in 2012 require that the filter performance be reevaluated since the signal shape can be influenced by in-time and out-of-time pileup. Using 2012 data, we examine various noise discriminants, specifically pulse shape discriminants (isolated, flat, spike, and triangle pulse shape), the isolation based filters, as well as other statistics, for the Hadronic Calorimeter (HCAL) barrel and endcap anomalous signals. Using these, we determine which areas of the detector are persistently noisy, as well as the performance of the algorithms on 2012 data. Overall, read-out-box 8 is particularly noisy this year, and the endcap regions have an unusual number of channels flagging as noise, but these channels are contributing low energy so the current algorithms are still acceptable. I have also proposed a new configuration of the algorithms to remove over-tagging of the HCAL endcap channels. A study of the HF region and filters is also presented on 2012 data. The performance of the HBHE and HF filters on six high pile-up runs in 2012 are also studied.", "date": "2012-09-27", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20130219-191834156", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130219-191834156", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Musk Foundation" } ] }, "local_group": { "items": [ { "id": "CMS@Caltech" }, { "id": "Physics-Department" } ] }, "pub_year": "2012", "author_list": "Lee, Lisa; Spiropulu, M.; et al." }, { "id": "https://authors.library.caltech.edu/records/nzrw4-s7a04", "eprint_id": 36996, "eprint_status": "archive", "datestamp": "2023-08-19 12:25:40", "lastmod": "2026-03-18 02:43:38", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Tong-T", "name": { "family": "Tong", "given": "Tony" } }, { "id": "Di-Marco-E", "name": { "family": "Di Marco", "given": "E." } }, { "id": "Spiropulu-M", "name": { "family": "Spiropulu", "given": "M." }, "orcid": "0000-0001-8172-7081" } ] }, "title": "Measurement of Z+jets/W+jets with muon final states Berends-Giele Scaling using 5 fb\u22121 of data at sqrt(s)=8TeV", "ispublished": "unpub", "full_text_status": "public", "keywords": "Compact Muon Solenoid", "abstract": "The analysis of vector-boson production in association to W \u2192 \u03bc\u03bd\nand Z \u2192 \u03bc\u03bc with jets is presented using 5.0 fb\u22121 of data collected\nin 2012 by the CMS detector at the LHC with \u221as = 8 TeV.", "date": "2012-08-30", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20130219-185131112", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130219-185131112", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "CMS@Caltech" }, { "id": "Physics-Department" } ] }, "pub_year": "2012", "author_list": "Tong, Tony; Di Marco, E.; et al." }, { "id": "https://authors.library.caltech.edu/records/193vv-ppe41", "eprint_id": 36997, "eprint_status": "archive", "datestamp": "2023-08-19 09:13:30", "lastmod": "2026-03-18 03:36:48", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chun-Sungbong", "name": { "family": "Chun", "given": "Sungbong" } }, { "id": "Spiropulu-M", "name": { "family": "Spiropulu", "given": "M." }, "orcid": "0000-0001-8172-7081" } ] }, "title": "Study of Lepton Final States in Proton-Proton Collisions with the CMS Detector at the LHC", "ispublished": "unpub", "full_text_status": "public", "keywords": "Compact Muon Solenoid", "abstract": "SURF 2012. Study of Lepton Final States in Proton-Proton Collisions with the CMS Detector at the LHC.", "date": "2012", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20130219-185547501", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130219-185547501", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "CMS@Caltech" }, { "id": "Physics-Department" } ] }, "pub_year": "2012", "author_list": "Chun, Sungbong and Spiropulu, M." }, { "id": "https://authors.library.caltech.edu/records/j87vs-aka48", "eprint_id": 36998, "eprint_status": "archive", "datestamp": "2023-08-19 09:13:37", "lastmod": "2026-03-18 02:45:25", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lambert-V", "name": { "family": "Lambert", "given": "Valere" } }, { "id": "Bornheim-A", "name": { "family": "Bornheim", "given": "A." }, "orcid": "0000-0002-0128-0871" }, { "id": "Spiropulu-M", "name": { "family": "Spiropulu", "given": "M." }, "orcid": "0000-0001-8172-7081" } ] }, "title": "Measurement of the CMS ECAL Performance with Z Dielectron Decay Events in 2012 Data", "ispublished": "unpub", "full_text_status": "public", "keywords": "Compact Muon Solenoid, SURF 2012", "abstract": "The detection and measurements of the decay mode of the Higgs boson into two photons for the Compact Muon Solenoid experiment (CMS) is crucially dependent on the energy resolution of the Electromagnetic Calorimeter (ECAL) as the energy resolution of the detector dominates the mass resolution of the decay channel. The mass resolution of the ECAL detector is measured by reconstructing the Z peak from its decay channel into two electrons with an optimization of electron ID selections and measuring the width of the peak by fitting it with a convolution of BreitWigner and CrystalBall functions. We measure the mass resolution of the CMS ECAL with Z dielectron decays in 2012 Data and Monte Carlo and discuss potential reasons for discrepancies between Data and Monte Carlo performance, such as regression corrections, MC shower simulation, detector calibration, laser correction from the detector monitoring system and increased pile up.", "date": "2012", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20130219-190325036", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130219-190325036", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "CMS@Caltech" }, { "id": "Physics-Department" } ] }, "pub_year": "2012", "author_list": "Lambert, Valere; Bornheim, A.; et al." }, { "id": "https://authors.library.caltech.edu/records/gxehz-3h581", "eprint_id": 36994, "eprint_status": "archive", "datestamp": "2023-08-19 09:13:17", "lastmod": "2026-03-18 03:41:36", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Takeda-Alex", "name": { "family": "Takeda", "given": "Alex" } }, { "id": "Spiropulu-M", "name": { "family": "Spiropulu", "given": "Maria" }, "orcid": "0000-0001-8172-7081" }, { "id": "Di-Marco-E", "name": { "family": "Di Marco", "given": "Emanuele" } } ] }, "title": "Study of Higgs detection in CMS experiment, and of the sensitivity to a Higgs boson in the mH < 130 GeV range", "ispublished": "unpub", "full_text_status": "public", "keywords": "Compact Muon Solenoid", "abstract": "SURF 2012. This project will be an experimental physics project to be developed at CERN, in collaboration with Caltech's CMS (Compact Muon Solenoid) group.", "date": "2012", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20130219-183700972", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130219-183700972", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "CMS@Caltech" }, { "id": "Physics-Department" } ] }, "pub_year": "2012", "author_list": "Takeda, Alex; Spiropulu, Maria; et al." }, { "id": "https://authors.library.caltech.edu/records/n9xdy-6qs48", "eprint_id": 37001, "eprint_status": "archive", "datestamp": "2023-08-19 09:13:50", "lastmod": "2026-03-18 03:40:43", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lee-Lisa", "name": { "family": "Lee", "given": "Lisa" } }, { "id": "Spiropulu-M", "name": { "family": "Spiropulu", "given": "M." }, "orcid": "0000-0001-8172-7081" }, { "id": "Chen-Yi", "name": { "family": "Chen", "given": "Y." }, "orcid": "0000-0003-2582-6469" }, { "id": "Apresyan-A", "name": { "family": "Apresyan", "given": "A." }, "orcid": "0000-0002-6186-0130" } ] }, "title": "Optimization of the hadron calorimeter in the CMS detector in the search for physics beyond the Standard Model", "ispublished": "unpub", "full_text_status": "public", "keywords": "Compact Muon Solenoid", "abstract": "SURF 2012. Optimization of the hadron calorimeter in the CMS detector in the search for physics beyond the Standard Model.", "date": "2012", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20130219-192153114", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130219-192153114", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "CMS@Caltech" }, { "id": "Physics-Department" } ] }, "pub_year": "2012", "author_list": "Lee, Lisa; Spiropulu, M.; et al." }, { "id": "https://authors.library.caltech.edu/records/hke92-ajw32", "eprint_id": 37003, "eprint_status": "archive", "datestamp": "2023-08-19 09:13:57", "lastmod": "2026-03-18 03:19:42", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Takeda-A", "name": { "family": "Takeda", "given": "Alex" } }, { "id": "Spiropulu-M", "name": { "family": "Spiropulu", "given": "M." }, "orcid": "0000-0001-8172-7081" }, { "id": "Xie-Si", "name": { "family": "Xie", "given": "S." }, "orcid": "0000-0003-2509-5731" }, { "id": "Di-Marco-E", "name": { "family": "Di Marco", "given": "E." } } ] }, "title": "Validation of procedures used by CMS in the characterization of Higgs candidate events.", "ispublished": "unpub", "full_text_status": "public", "keywords": "Compact Muon Solenoid", "note": "I would like to thank Si Xie and Emanuele di Marco for their hands-on guidance and assistance at CERN, and Prof. Maria Spiropulu and Prof. Harvey Newman for their mentoring and advice, together with the entire Caltech CMS group for the support. The work presented in this report was partially funded by the Musk Foundation.", "abstract": "With the recent announcement of the discovery of a new bosonic state at the Large Hadron Collider (LHC), hypothesized to be the long-sought Higgs boson, the correctness of the procedures used for characterization and classification of this state has become very relevant. This project worked on a number of different aspects in the analysis of the HZZ4l decay channel, related especially to lepton detection. Characterization of this channel relies on the accurate prediction of lepton detection efficiency and resolution, but currently used algorithms for prediction of these detector effects are computationally demanding. This project developed a validation procedure for a faster simulation algorithm written by the Caltech group, and showed its adequacy for predicting efficiency and resolution. Another issue analyzed in lepton detection was the use of multivariate analysis techniques, such as boosted decision trees, for reconstruction of the actual lepton energies from detected values, in order to discover whether the current reconstruction algorithms can be improved. Some questions outside of the scope of lepton detection were also analyzed, such as the distributions of the two intermediate Z in the HZZ4l decay. The official analysis uses an invariant mass proximity criterion to perform the pairing, but there are other possible pairing criteria that could be helpful in the detection of new physics. Current data in the signal region is scarce, but the algorithms developed for this pairing analysis will be available for future, larger datasets.", "date": "2012", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20130219-192830641", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130219-192830641", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Musk Foundation" } ] }, "local_group": { "items": [ { "id": "CMS@Caltech" }, { "id": "Physics-Department" } ] }, "primary_object": { "basename": "Takeda-FINAL-SFP.pdf", "url": "https://authors.library.caltech.edu/records/hke92-ajw32/files/Takeda-FINAL-SFP.pdf" }, "pub_year": "2012", "author_list": "Takeda, Alex; Spiropulu, M.; et al." }, { "id": "https://authors.library.caltech.edu/records/v5d45-3ah49", "eprint_id": 36999, "eprint_status": "archive", "datestamp": "2023-08-19 09:13:43", "lastmod": "2026-03-18 02:53:26", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chen-Kevin-Physics", "name": { "family": "Chen", "given": "Kevin" } }, { "id": "Spiropulu-M", "name": { "family": "Spiropulu", "given": "M." }, "orcid": "0000-0001-8172-7081" }, { "id": "Kcira-D", "name": { "family": "Kcira", "given": "D." }, "orcid": "0000-0002-8190-2414" }, { "id": "Bunn-J", "name": { "family": "Bunn", "given": "J." }, "orcid": "0000-0002-3798-298X" } ] }, "title": "Using Map/Reduce for Analyzing Physics Data from the Large\n Hadron Collider", "ispublished": "unpub", "full_text_status": "public", "keywords": "Compact Muon Solenoid, SURF 2012", "abstract": "Use map-reduce methods to set up tools for analysis of large data samples from the experiments at the Large Hadron Collider in Switzerland.", "date": "2012", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20130219-191423551", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130219-191423551", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "CMS@Caltech" }, { "id": "Physics-Department" } ] }, "pub_year": "2012", "author_list": "Chen, Kevin; Spiropulu, M.; et al." }, { "id": "https://authors.library.caltech.edu/records/g0a9d-ctp18", "eprint_id": 37002, "eprint_status": "archive", "datestamp": "2023-08-19 05:35:48", "lastmod": "2026-03-18 03:10:22", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Horton-M", "name": { "family": "Horton", "given": "Max" } }, { "id": "Spiropulu-M", "name": { "family": "Spiropulu", "given": "M." }, "orcid": "0000-0001-8172-7081" }, { "id": "Duarte-J", "name": { "family": "Duarte", "given": "J." } }, { "id": "Rogan-C", "name": { "family": "Rogan", "given": "C." }, "orcid": "0000-0002-4166-4503" } ] }, "title": "Developing A Maximum Likelihood Fit Workspace In RooFit/ROOT", "ispublished": "unpub", "full_text_status": "public", "keywords": "Compact Muon Solenoid", "abstract": "SURF 2012. Developing A Maximum Likelihood Fit Workspace In RooFit/ROOT.", "date": "2011-02-17", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20130219-192428019", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130219-192428019", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "CMS@Caltech" }, { "id": "Physics-Department" } ] }, "pub_year": "2011", "author_list": "Horton, Max; Spiropulu, M.; et al." }, { "id": "https://authors.library.caltech.edu/records/ex037-yyt89", "eprint_id": 75504, "eprint_status": "archive", "datestamp": "2023-08-20 00:31:50", "lastmod": "2026-03-18 00:18:19", "type": "publication_deliverable", "metadata_visibility": "show", "creators": { "items": [ { "id": "Sembach-K", "name": { "family": "Sembach", "given": "Kenneth" } }, { "id": "Mountain-M", "name": { "family": "Mountain", "given": "Matt" } }, { "id": "Hauser-M", "name": { "family": "Hauser", "given": "Mike" } }, { "id": "Tananbaum-H", "name": { "family": "Tananbaum", "given": "Harvey" } }, { "id": "Wilkes-B-J", "name": { "family": "Wilkes", "given": "Belinda" }, "orcid": "0000-0003-1809-2364" }, { "id": "Soifer-B-T", "name": { "family": "Soifer", "given": "Tom" }, "orcid": "0000-0002-8112-1132" }, { "id": "Storrie-Lombardi-L-J", "name": { "family": "Storrie-Lombardi", "given": "Lisa" }, "orcid": "0000-0002-5987-5210" } ] }, "title": "Astro2010: State of the Profession Position Paper: The Value of Observatory-Class Missions", "ispublished": "unpub", "full_text_status": "public", "note": "

Published - Sembach_Observatories_FFP.pdf

", "abstract": "The dramatic success of NASA's astrophysics science program over the past 20 years has resulted from a series of assets in space ranging from Small Explorers to Observatory-Class\nmissions. NASA's Observatory-Class missions, such as the Chandra X-ray Observatory (CXO), the Hubble Space Telescope (HST), and the Spitzer Space Telescope (SST), form the\ncornerstone of this program by providing all researchers, regardless of institutional affiliation, a spectrum of science opportunities across programs large and small. These observatories stand out in their breadth of capabilities and consequent diversity of high impact science, their reach within the scientific community, and their proven ability to inspire the nation. Each mission was\ndesigned to address specific scientific imperatives recognized by past Decadal Survey Committees, whether it was to refine the extragalactic distance scale, examine galaxies as they were in the distant past, determine the relationship between black holes and quasars, observe the\nultimate fate of stars in their death throes, or reveal heavily obscured regions of star-formation. These were ambitious goals, as are those envisioned for future Observatory-Class missions, such as the James Webb Space Telescope (JWST).", "date": "2009", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20170329-092612598", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170329-092612598", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "Infrared-Processing-and-Analysis-Center-(IPAC)" }, { "id": "Physics-Department" } ] }, "primary_object": { "basename": "Sembach_Observatories_FFP.pdf", "url": "https://authors.library.caltech.edu/records/ex037-yyt89/files/Sembach_Observatories_FFP.pdf" }, "pub_year": "2009", "author_list": "Sembach, Kenneth; Mountain, Matt; et al." } ]