Book Section records
https://feeds.library.caltech.edu/people/Ramsey-Musolf-M-J/book_section.rss
A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenThu, 30 Nov 2023 18:25:37 +0000Probing Supersymmetry with Neutral Current Scattering Experiments
https://resolver.caltech.edu/CaltechAUTHORS:20110823-092715120
Authors: Kurylov, A.; Ramsey-Musolf, M. J.; Su, Shufang
Year: 2004
DOI: 10.1063/1.1664218
We compute the supersymmetric contributions to the weak charges of the electron (Q^e_W) and proton (Q^P_W) in the framework of Minimal Supersymmetric Standard Model. We also consider the ratio of neutral current to charged current cross sections, R_v and R_v at v(v)-nucleus deep inelastic scattering, and compare the supersymmetric corrections with the deviations of these quantities from the Standard Model predictions implied by the recent NuTeV measurement.https://authors.library.caltech.edu/records/e7dnj-k6377Charged current universality problem and NuTeV anomaly: is SUSY to blame?
https://resolver.caltech.edu/CaltechAUTHORS:20110831-130832432
Authors: Kurylov, Andriy; Ramsey-Musolf, Michael J.; Su, Shufang
Year: 2004
DOI: 10.1063/1.1664223
We compute the complete one-loop contributions to low-energy charged current weak interaction observables in the Minimal Supersymmetric Standard Model (MSSM). We obtain the constraints on the MSSM parameter space which arise when precision low-energy charged current (CC) data are analyzed in tandem with measurements of the muon anomaly. The data imply a pattern of mass splittings among first and second generation sleptons and squarks which contradicts predictions of widely used models for supersymmetry breaking mediation. We also discuss the implications of these constraints on the SUSY one-loop contributions to the (anti)neutrino-nucleus deep inelastic scattering. We consider the ratios of neutral current to charged current cross sections, and compare with the deviations of these quantities from the Standard Model predictions implied by the recent NuTeV measurement. We discuss one scenario in which a right-sign effect arises, and show that it is ruled out by the CC data. We also study R parity-violating contributions. Although such effects can account for the violation of the first row CKM unitarity, they can not reproduce the NuTeV anomaly. If NuTeV anomaly is ultimately explained within the SM, R parity-violating resolution of the CKM unitarity problem can be tested in parity-violating electron scattering experiments at SLAC and TJNAF.https://authors.library.caltech.edu/records/her4n-kkg88Parity-violation with electrons: Theoretical perspectives
https://resolver.caltech.edu/CaltechAUTHORS:20200205-161119832
Authors: Ramsey-Musolf, M. J.
Year: 2005
DOI: 10.1007/3-540-26345-4_49
I review recent progress and developments in parity-violating electron scattering as it bears on three topics: strange quarks and hadron structure, electroweak radiative corrections, and physics beyond the Standard Model. I also discuss related developments in parity-conserving scattering with transversely polarized electrons as a probe of two-photon processes. I conclude with a perspective on the future of the field.https://authors.library.caltech.edu/records/e9a3e-e1v23Schiff Theorem and the Electric Dipole Moments of Hydrogen-Like Atoms
https://resolver.caltech.edu/CaltechAUTHORS:LIUaipcp06
Authors: Liu, C.-P.; Haxton, W. C.; Ramsey-Musolf, M. J.; Timmermans, R. G. E.; Dieperink, A. E. L.
Year: 2006
DOI: 10.1063/1.2220378
The Schiff theorem is revisited in this work and the residual P- and T-odd electron-nucleus interaction, after the shielding takes effect, is completely specified. An application is made to the electric dipole moments of hydrogen-like atoms, whose qualitative features and systematics have important implication for realistic paramagnetic atoms.https://authors.library.caltech.edu/records/7yk58-h2q38Probing the Fundamental Symmetries of the Early Universe: The Low Energy Frontier
https://resolver.caltech.edu/CaltechAUTHORS:20110727-095730839
Authors: Ramsey-Musolf, M. J.
Year: 2006
DOI: 10.1063/1.2220352
Searching for the fundamental symmetries that characterize the particle physics of the
early universe lies at the forefront of particle physics, nuclear physics, and cosmology. In this talk, I
review low energy probes of these symmetries and discuss what they may teach us about what lies
beyond fundamental symmetries of the Standard Model.https://authors.library.caltech.edu/records/v8nfx-mmb15Magnetic Moments of Dirac Neutrinos
https://resolver.caltech.edu/CaltechAUTHORS:BELaipcp06b
Authors: Bell, Nicole F.; Cirigliano, V.; Ramsey-Musolf, M. J.; Vogel, P.; Wise, Mark B.
Year: 2006
DOI: 10.1063/1.2220408
The existence of a neutrino magnetic moment implies contributions to the neutrino mass via radiative corrections. We derive model-independent "naturalness" upper bounds on the magnetic moments of Dirac neutrinos, generated by physics above the electroweak scale. The neutrino mass receives a contribution from higher order operators, which are renormalized by operators responsible for the neutrino magnetic moment. This contribution can be calculated in a model independent way. In the absence of fine-tuning, we find that current neutrino mass limits imply that µv < 10^–14 Bohr magnetons. This bound is several orders of magnitude stronger than those obtained from solar and reactor neutrino data and astrophysical observations.https://authors.library.caltech.edu/records/hrpn4-fms36Constraints on Muon Decay Parameters from Neutrino Mass
https://resolver.caltech.edu/CaltechAUTHORS:ERWaipcp06
Authors: Erwin, Rebecca J.; Kile, Jennifer; Ramsey-Musolf, Michael J.; Wang, Peng
Year: 2006
DOI: 10.1063/1.2402627
We derive model-independent constraints on chirality-changing terms in the muon decay Lagrangian using limits on neutrino mass. We consider all dimension-six operators invariant under the gauge symmetry of the Standard Model which contribute to either a Dirac neutrino mass or muon decay. Taking an upper limit on neutrino mass of 1eV, we derive limits on the contributions of chirality-changing operators to the Michel parameters four orders of magnitude tighter than the current experimental constraints. We also identify two operators which, due to their flavor structure, are not constrained by neutrino mass. If near-future experiments find contributions to muon decay from these operators, it could indicate interesting flavor structure in physics beyond the SM.https://authors.library.caltech.edu/records/91p93-qxk69Model Independent Naturalness Bounds on Magnetic Moments of Majorana Neutrinos
https://resolver.caltech.edu/CaltechAUTHORS:GORaipcp07
Authors: Gorchtein, Mikhail; Bell, Nicole F.; Ramsey-Musolf, Michael J.; Vogel, Petr; Wang, Peng
Year: 2007
DOI: 10.1063/1.2735181
We analyze the implications of neutrino masses for the magnitude of neutrino magnetic moments. By considering electroweak radiative corrections to the neutrino mass, we derive model-independent naturalness upper bounds on neutrino magnetic moments, generated by physics above the electroweak scale. For Majorana neutrinos, these bounds are weaker than present experimental limits if µnu if generated by new physics at ~ 1 TeV, and surpass current experimental sensitivity only for new physics scales > 10 – 100 TeV. The discovery of a neutrino magnetic moment near present limits would thus signify that neutrinos are Majorana particles.https://authors.library.caltech.edu/records/8hf40-4m106Fundamental Symmetries of the Early Universe and the Precision Frontier
https://resolver.caltech.edu/CaltechAUTHORS:20160511-133917351
Authors: Ramsey-Musolf, Michael J.
Year: 2009
DOI: 10.1063/1.3293888
The search for the next Standard Model of fundamental interactions is being carried out at two frontiers: the high energy frontier involving the Tevatron and Large Hadron Collider, and the high precision frontier where the focus is largely on low energy experiments. I discuss the unique and powerful window on new physics provided by the precision frontier and its complementarity to the information we hope to gain from present and future colliders.https://authors.library.caltech.edu/records/9xya3-k8t67Nuclear Physics and the New Standard Model
https://resolver.caltech.edu/CaltechAUTHORS:20160420-091112925
Authors: Ramsey-Musolf, Michael J.
Year: 2010
DOI: 10.1063/1.3480187
Nuclear physics studies of fundamental symmetries and neutrino properties have played a vital role in the development and confirmation of the Standard Model of fundamental interactions. With the advent of the CERN Large Hadron Collider, experiments at the high energy frontier promise exciting discoveries about the larger framework in which the Standard Model lies. In this talk, I discuss the complementary opportunities for probing the "new Standard Model" with nuclear physics experiments at the low‐energy high precision frontier.https://authors.library.caltech.edu/records/910bx-npv46