Bulletin of the American Physical Society
2019 Fall Meeting of the APS Division of Nuclear Physics
Volume 64, Number 12
Monday–Thursday, October 14–17, 2019; Crystal City, Virginia
Session EL: Mini-Symposium on Fundamental Symmetries: Theory and Experiment I |
Hide Abstracts |
Chair: Nadia Fomin, University of Tennessee Room: Salon H |
Tuesday, October 15, 2019 8:30AM - 9:06AM |
EL.00001: Nuclear Probes of Physics Beyond the Standard Model Invited Speaker: E. Mereghetti Low-energy tests of fundamental symmetries are extremely sensitive probes of physics beyond the Standard Model (BSM), reaching scales that are comparable, if not higher, than directly accessible at the energy frontier. The interpretation of low-energy precision experiments and their connection with models of BSM physics relies on controlling the theoretical uncertainties induced by the nonperturbative nature of QCD at low energy and of the nuclear interactions. In this talk I will discuss how Effective Field Theories (EFTs) techniques can lead to a unified description of high- and low-energy probes of new physics, allowing for detailed comparisons between their sensitivities, and to improved predictions for low-energy experiments, with controlled theoretical uncertainties. \\ \\ I will discuss in details the examples of hadronic and nuclear electric dipole moments (EDMs) and neutrinoless double beta decays. After establishing a model-independent EFT description for these process, I will review progress in the first-principle calculations of the nucleon EDM and of the time-reversal-violating and lepton-number-violating chiral potentials, the key one- and two-nucleon input for few-body calculations. I will then discuss recent few-body results and the phenomenological implications for BSM physics. [Preview Abstract] |
Tuesday, October 15, 2019 9:06AM - 9:18AM |
EL.00002: Parity- and Time-Reversal-Violation in Nuclear Systems and the Large-$N_C$ Expansion Jared Vanasse At low energies ($E |
Tuesday, October 15, 2019 9:18AM - 9:30AM |
EL.00003: ABSTRACT WITHDRAWN |
Tuesday, October 15, 2019 9:30AM - 9:42AM |
EL.00004: \textbf{Update on Tests of the Standard Model from the Qweak Experiment} Gregory Smith, Roger Carlini, Willem Van Oers, Mark Pitt The final results of the Qweak collaboration were published last year (Androic, et al., Nature 557, 207 (2018)). That work describes how the proton's weak charge was extracted from the parity-violating asymmetry measured in ep scattering at Q$^{\mathrm{2}}=$0.0248 (GeV/c)$^{\mathrm{2}}$. Here we describe a new fitting technique which has the advantage that the extrapolation is linear in Q$^{\mathrm{2}}$. The weak charge obtained in this new procedure is consistent with that obtained in the recent publication. We provide some new and interesting comparisons of the Qweak sin$^{\mathrm{2}}\theta_{\mathrm{W}}$ result with the predicted running and Z-pole results. We explore the flavor dependence of the mass reach from the Qweak experiment in the context of potential new weak-charge experiments on the proton and in atomic nuclei. We also show the dependence of the mass reach on coupling strength, highlighting a few examples of the limits set for specific new physics. [Preview Abstract] |
Tuesday, October 15, 2019 9:42AM - 9:54AM |
EL.00005: In search for BSM physics in the beta decay of 45Ca Noah Birge The Standard Model (SM) has become one of the most complete theories encapsulating fundamental particle interactions. Despite its far ranging success, neutrino flavor oscillations, the observed baryon asymmetry, the dark matter puzzle, and complete absence of gravity from the theory makes it clear that there must exist interactions and particles beyond the standard model (BSM). A nonzero Fierz interference term in beta decay is one such candidate to test BSM physics. The Fierz term results from scalar and tensor interactions not included in the SM. The strength of the coupling manifests in the form of a distortion of the beta decay electron energy spectrum. A set of beta spectrum measurements for $^{45}$Ca was completed at the Los Alamos Neutron Science Center in 2017 and I will present details of analysis along with preliminary results. [Preview Abstract] |
Tuesday, October 15, 2019 9:54AM - 10:06AM |
EL.00006: A Search for Exotic Spin-Gravity Couplings Through Polarized Neutron Interferometry Kyle Steffen, Robert Dalgliesh, Niels Geerits, Steven Parnell, Jeroen Plomp, Roger Pynn, W. Michael Snow, Nina-Juliane Steinke, Ad Van Well, Victor De Haan In 1975 Collela, Overhauser, and Werner demonstrated the accessibility of gravitationally- induced phase shifts in quantum systems using perfect silicon crystal neutron interferometry. [1] Recently, further measurement of this effect has been made using the OffSpec instrument (ISIS-RAL) in spin-echo mode to act as a polarized neutron interferometer. [2] The ability to interfere neutrons of various polarization orientations to measure gravitationally-induced phase shifts provides an opportunity to search for spin-dependent gravitational effects. [3] I will describe a direct search for Lorentz violating spin-gravity couplings in the fermion sector of the Standard Model Extension. [4] An overview of the experimental system will be presented, as well as the status of data collection and analysis.\\ \\$[1]$ R. Colella, A.W. Overhauser, S.A. Werner, Phys. Rev. Lett. 34 (1975)\\ $[2]$ V.O. de Haan, {\it et al.}, Phys. Rev. A 89 (2014)\\ $[3]$ Y. Bonder, Phys. Rev. D 88 (2013)\\ $[4]$ Z. Li and A. Kostelecky, private communication (2019) [Preview Abstract] |
Tuesday, October 15, 2019 10:06AM - 10:18AM |
EL.00007: ABSTRACT WITHDRAWN |
Tuesday, October 15, 2019 10:18AM - 10:30AM |
EL.00008: New constraints on exotic spin- and velocity-dependent interactions of polarized electrons with an atomic magnetometer. Young Jin Kim, Pinghan Chu, Igor Savukov, Shaun Newman Many theoretical extensions of the Standard Model of particle physics predicted exotic spin-dependent interactions between fermions mediated by new fundamental spin-0 or spin-1 bosons such as the axion and axionlike particles. The new bosonic particles may explain several important unsolved mysteries in physics, e.g., matter-antimatter asymmetry and the existence of the dark matter. Recently, we conducted a search for exotic spin- and velocity-dependent interactions for polarized electrons. The experiment is based on a high-sensitivity atomic magnetometer containing an optically polarized atomic vapor, which serves as both a source of polarized electrons and a magnetic-field detector. This approach aims to detect magnetic-fieldlike effects from the exotic interactions between the polarized~electrons in an atomic magnetometer vapor cell and unpolarized nucleons of a closely located solid-state mass. In this talk, we report new experimental constraints on the exotic interactions. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700