Bulletin of the American Physical Society
2020 Fall Meeting of the APS Division of Nuclear Physics
Volume 65, Number 12
Thursday–Sunday, October 29–November 1 2020; Time Zone: Central Time, USA
Session EF: Mini-Symposium: Low Energy Probes of New Physics I |
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Chair: Ernst Sichtermann, LBNL |
Friday, October 30, 2020 10:30AM - 11:06AM |
EF.00001: The Muon g-2 Experiment at Fermilab and the Search for New Physics Invited Speaker: David Kawall Precision measurements at low energies complement direct measurements at high energy colliders in the search for new physics. For instance, the muon g-2 experiment at Fermilab will measure the muon anomalous magnetic moment $a_{\mu}$ to 140 ppb, a four-fold improvement over the previous measurement at Brookhaven. The result will be compared with one of the most precise predictions of the Standard Model, accurate to 370 ppb (8 significant figures), as a test of the completeness of the Standard Model, with broad sensitivity to new particles and interactions. Similarly, a program of precision measurements at JLab is underway, where the M$\o${}ller measurement of parity-violation in e-e scattering, a 33 ppb asymmetry to be measured to 0.7 ppb, will determine the weak mixing angle with unmatched accuracy at low $Q^{2}$, providing sensitivity to new neutral currents with origins beyond the Standard Model and other new physics spanning the MeV to multi-TeV scale. The status and role of experiments at low energy in the search for new physics will be described.\\ \\The author is supported by the DOE under Grant DE- FG02-88ER40415 and acknowledges support from the Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. DOE-OHEP. [Preview Abstract] |
Friday, October 30, 2020 11:06AM - 11:18AM |
EF.00002: A Cryogenic Search for the Neutron Electric Dipole Moment at the Spallation Neutron Source Alina Aleksandrova One of the most interesting puzzles in physics is the baryon asymmetry of the universe (BAU). One requirement to explain the observed BAU is the violation of the combined charge conjugation (C) and parity (P) symmetries. While the Standard Model (SM) of particle physics contains sources of CP violation, it is unable to explain the BAU. In order to help reconcile theory and observation, additional sources of CP violation are needed. One of the most sensitive probes of CP violation is the neutron electric dipole moment (nEDM), for which the current upper limit is $d_{n} < 3.0 \times 10^{-26}$ e-cm (90\% CL). This talk will present the status of a new cryogenic apparatus under construction at the Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory (ORNL) which aims to reduce the current upper limit by two orders of magnitude with a targeted sensitivity of $d_{n} < 3.0 \times 10^{-28}$ e-cm. [Preview Abstract] |
Friday, October 30, 2020 11:18AM - 11:30AM |
EF.00003: Status of the neutron Electric Dipole Moment search at Los Alamos National Laboratory Austin Reid A permanent neutron EDM presents an experimentally accessible measurement of beyond Standard Model physics. Further improvements on the more than a decade old nEDM upper bound have been hindered by insufficient ultracold neutron (UCN) density and by magnetic field inhomogeneities. The improved UCN storage density generated by LANL's upgraded solid deuterium UCN source combined with a newly designed magnetically shielded room and magnetometry suite should yield a nEDM sensitivity of $3\times10^{-27}~\mathrm{e}\cdot\mathrm{cm}$. This talk will present the status of the experiment and its projected timeline. [Preview Abstract] |
Friday, October 30, 2020 11:30AM - 11:42AM |
EF.00004: Analysis of the APEX Experiment Data Sean Jeffas, David Hamilton, Mark Jones, Vardan Khachatryan, Nilanga Liyanage, John Williamsom, Bogdan Wojtsekhowski The A-Prime Experiment (APEX) took data for the search for dark matter force mediator A’ in the mass range 160-230 MeV decaying to e+e- pairs with statistics corresponding to the signal sensitivity on the level of coupling constant $10^{-9}$. This experiment was carried out in Jefferson Lab experimental hall A in 2019 using the High Resolution Spectrometer (HRS) pair. We will present the results on the magnetic optics for accurate reconstruction of the particle momenta for the APEX configuration of the HRS spectrometers with the septum magnet. Preliminary results show that angular reconstruction could be accomplished with a precision of 0.5 msr or better. [Preview Abstract] |
Friday, October 30, 2020 11:42AM - 11:54AM |
EF.00005: Polarized Electron Source for the MOLLER Experiment Caryn Palatchi The MOLLER experiment at Jefferson Laboratory will be part of a new generation of ultra high precision electroweak experiments. It will measure the Moller (electron-electron scattering) parity-violating asymmetry, providing an unprecedented precision on the electroweak mixing angle. To achieve the parity quality beam necessary for the small systematic uncertainties required in MOLLER, innovative techniques in the electron source are required. A critical component of the experiment is to control helicity correlated false asymmetries in the polarized electron beam using a newly installed RTP Pockels cell system in the laser optics of the polarized electron source. This talk will describe the development of the this new RTP Pockels cell system in the injector source with precision nano-meter level control capabilities which show promise for the future MOLLER Experiment. [Preview Abstract] |
Friday, October 30, 2020 11:54AM - 12:06PM |
EF.00006: Determination of the Muon Anomalous Precession Frequency Kevin Labe We describe the precision measurement of the anomalous precession frequency of the muon in the Fermilab muon g-2 experiment. Anomalous precession arises from the difference between the cyclotron and spin precession frequencies of the muon in the magnetic field of a storage ring, and enables a measurement of the anomalous magnetic moment. The precession frequency is measured using calorimeters which detect the muons' positron daughters. We discuss the reconstruction and analysis techniques applied, the determination of systematic uncertainties, and the method for combining our numerous correlated analyses. [Preview Abstract] |
Friday, October 30, 2020 12:06PM - 12:18PM |
EF.00007: Magnetic field transients induced by pulsed kickers in the Muon g-2 experiment Jarek Kaspar The Fermilab Muon $g-2$ experiment is a high-precision measurement of the anomalous magnetic moment of the muon aiming at a factor of four improvment over the previous effort at BNL. The experiment measures the spin precession frequency of the muon in a very uniform magnetic field. One source of magnetic field uncertainty is transient magnetic fields from eddy currents in the vacuum chambers induced by the pulsed kicker magnets. The field transients include fast exponentially decaying eddy currents following the kick, and slower transients induced by a mechanical motion of the kicker plates and mechanical vibrations of the vacuum chamber. These field transients are measured using a magnetometer based on Faraday rotation in a crystal of TGG. A precision better than 1 micro-Tesla is required, compared to the kick pulse strength of 26 milli-Tesla, on the background of the main magnet field of 1.45 Tesla. The magnetometer design, performance, and data analysis resulting in an upper limit on the magnetic field transients for the purpose of Run-1 publication will be presented. [Preview Abstract] |
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