Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session FL: BSM Searches in Fundamental Symmetries IV: Muons and Light Mesons |
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Chair: Emilie Passemar, Indiana University Room: Georgian |
Tuesday, October 12, 2021 2:00PM - 2:12PM |
FL.00001: Precision measurements of rare pion decays in the PIENUX experiment. Tim Gorringe
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Tuesday, October 12, 2021 2:12PM - 2:24PM |
FL.00002: Status of the Jefferson Lab Eta Factory (JEF) experiment Simon Taylor The Jefferson Lab Eta Factory (JEF) experiment will leverage an upgraded GlueX |
Tuesday, October 12, 2021 2:24PM - 2:36PM |
FL.00003: Nucleon-level Effective Theory of Muon to Electron Conversion in Nuclei Evan J Rule The observation of neutrino flavor oscillations shows that lepton flavor is not conserved in nature, raising the question of whether similar phenomena will be found among the charged leptons. For this reason, new experiments to search for µ-to-e conversion - a muon bound in a 1s orbital around a nucleus converts into an outgoing mono-energetic electron – are a high priority at Fermilab (Mu2e) and J-PARC (COMET). |
Tuesday, October 12, 2021 2:36PM - 2:48PM |
FL.00004: Radiative muon capture mysteries and the search for μ- N(A,Z) --> e+ N'(A,Z-2) Michael J MacKenzie, Pavel Murat Experimentally observed conservation of flavor for charged leptons makes them very different from other fermions - the quarks and neutrinos - for which mixing among generations is large and has been established long ago. In the Standard Model (SM), charged lepton flavor violating (CLFV) processes are suppressed by small neutrino masses down to the level well below experimental reach. For example, the expected Br(μ- N --> e- N) is approximately 1e-52. Many models beyond the SM (BSM) predict much higher rates of CLFV and lepton number violating (LNV) processes. |
Tuesday, October 12, 2021 2:48PM - 3:00PM |
FL.00005: An experiment testing a possible gravitational contribution to CP violation in the neutral kaon system Anthony Palladino, Giovanni M Piacentino, Graziano Venanzoni, Riccardo Pilato, Livio Conti, Antonio Gioiosa, Vincenzo Testa, Fedor V Ignatov, Dragan Hajdukovic, Fausto Fasano An indirect experimental test of the gravitational interaction of antimatter can be performed by measuring the branching fraction of the CP violating decay of KL in a low gravity environment, either in Earth orbit or on the moon. The Standard Model explains some of the CP violation through the pure phase in the CKM matrix, however ample room remains for CP violation contributions from other interactions and forces in the mixing of the neutral K and B mesons. Gravitation is a good candidate for such a contribution. We present new simulation results showing that the lower gravitational strength in space may change the level of CP violation such that a 5 sigma discrimination may be obtained by measuring the KL produced by the cosmic proton flux on a dedicated detector within a relatively short time frame. |
Tuesday, October 12, 2021 3:00PM - 3:12PM |
FL.00006: Abstract Withdrawn
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Tuesday, October 12, 2021 3:12PM - 3:24PM |
FL.00007: The Pitch and Electric Field Corrections to the Anomalous Muon Spin Precession Frequency for the Muon g - 2 Experiment Tyler J Barrett, David L Rubin, Antoine Chapelain, Joshua Fagin, James Mott The Muon g - 2 Experiment at Fermilab recently reported a new measurement of the muon's anomalous magnetic moment, aμ = (gμ - 2)/2, with a relative uncertainty of 460 parts-per-billion (ppb). The experiment uses a highly uniform magnetic storage ring to contain a polarized muon bunch, whose daughter particles are detected by calorimeters. This signal encodes the anomalous precession of the muon spin relative to the momentum at a frequency ωa, which is directly proportional to aμ. However, beam dynamics effects perturb the relationship by hundreds of ppb, necessitating corrections to the measured ωa. One effect, called the pitch correction, is associated with oscillations induced by vertically focusing electric quadrupoles. Another, called the electric field correction, originates from the radial component of the quadrupoles' electric field. Both corrections must increase the observed ωa in order to restore the proportionality with aμ. In this talk, we present the analysis of the pitch and electric field corrections during the experiment's Run 1 measurement period. |
Tuesday, October 12, 2021 3:24PM - 3:36PM |
FL.00008: A new ratio Q-method analysis for precession frequency measurement in Muon g-2 experiment Ritwika Chakraborty
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Tuesday, October 12, 2021 3:36PM - 3:48PM |
FL.00009: Search for CP violation in ortho-Positronium decay Tom-Erik Haugen, Elizabeth A George, Oscar Naviliat-Cuncic, Paul A Voytas The combined charge parity (CP) symmetry violation can only be accommodated in the Standard Model through CP violating phases in the fermion mixing matrices. This has a negligible effect on many processes. Positronium (Ps) is a leptonic state that decays to photons. Observation of CP violation in Ps decay would indicate physics beyond the Standard Model. This has been searched for twice, to 10-2 and 10-3 precision. We are designing and constructing a new apparatus to reach 10-4 precision. The apparatus will consist of a positron source between two fast scintillators for positron detection. The source area is then surrounded with low density powder for Ps formation, all of which is placed inside an array of photon detectors to measure correlations between the decay photons. This will run inside the Positron Polarimeter magnet at FRIB, a superconducting solenoid with a large diameter warm bore, to provide tensor polarized Ps. We present the experimental outline, the design and optimization of the detector array, and the progress on Ps formation. With this design we expect to reach our target sensitivity with 35 days of continuous running. |
Tuesday, October 12, 2021 3:48PM - 4:00PM |
FL.00010: Studies of radioactive molecules at ISOLDE-CERN Shane Wilkins Molecules that are composed of at least one unstable isotope offer a versatile platform upon which a diverse range of physical phenomena can be explored. In fundamental physics studies, subtle effects resulting from the violation of fundamental symmetries can be dramatically amplified in certain classes of molecules [1-4]. These additional dimensions enable a particular molecule to be engineered to possess an unparalleled sensitivity to a particular symmetry-violating effect that far exceeds the systems that currently set the strictest limits on new physics beyond the Standard Model. In addition to being of marked interest for fundamental physics, these molecules are of significance in other areas of research encompassing nuclear structure [5], chemistry [6] and astrophysics [7]. |
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