Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Y03: Selected Topics in Fundamental Symmetries and the Intensity FrontierInvited
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Sponsoring Units: DPF DNP Chair: Nadia Fomin, University of Tennessee Room: Sheraton Plaza E |
Tuesday, April 16, 2019 1:30PM - 2:06PM |
Y03.00001: Lepton Number Violation and Neutrinoless Double Beta Decay Invited Speaker: Vincenzo Cirigliano In this talk I will discuss the significance of neutrinoless double beta decay as a probe of lepton number violation (LNV). After an introduction on lepton number in particle physics and cosmology, I will describe an end-to-end effective field theory (EFT) framework connecting the possibly very high scale at which LNV originates to the nuclear scale. Such a framework is essential to assess the discovery potential and model diagnosing power of neutrinoless double beta decay searches. On the high-energy end, the EFT allows one to classify the sources of LNV according to the mass scale at which they arise. On the low-energy end, the EFT allows one to organize contributions to hadronic and nuclear matrix elements in a systematic expansion, which together with nuclear many body methods is the basis to reach controlled uncertainties in the near future. After discussing recent developments in the EFT approach, I will illustrate the framework through explicit examples, such as the high scale seesaw model and the TeV scale left-right-symmetric model. |
Tuesday, April 16, 2019 2:06PM - 2:42PM |
Y03.00002: Measuring the Anomalous Magnetic Moment of the Muon Invited Speaker: David J. Flay The anomalous magnetic moment of the muon, characterized as the anomaly aμ ≡ (gμ-2)/2, remains a compelling hint of physics beyond the Standard Model (BSM) in light of the Brookhaven E821 measurement from the early 2000s, which differs with theoretical predictions at the 3.7σ level. To address this discrepancy, the Muon g-2 Experiment at Fermilab (E989) has been designed to determine aμ to a precision of 140 parts per billion, a four-fold improvement over the E821 measurement. This improved precision presents an excellent opportunity to uncover BSM physics, and at minimum constrain BSM models. In its first physics run in 2017--2018, the E989 experiment recorded nearly a factor of 2 more statistics (before data quality cuts) than was recorded at BNL, and is currently taking its second run of physics-quality data. An overview of the experimental technique will be discussed, along with an update of the analysis of the Run-1 data and current run progress. Additionally, we will review worldwide aμ efforts in presenting an update on recent theoretical progress, the new experiment being built at KEK, and related muon physics in the muonium hyperfine splitting experiment MuSEUM. |
Tuesday, April 16, 2019 2:42PM - 3:18PM |
Y03.00003: An Improved Measurement of the Neutron Decay Beta-Neutrino Correlation with the aCORN Experiment Invited Speaker: Fred E Wietfeldt The decay of the free neutron into a proton, electron, and antineutrino is the simplest example of nuclear beta decay. The electron-antineutrino correlation (a-coefficient) is one of several important experimental parameters of neutron decay. Together these parameters can be used to determine the charged weak couplings of neutrons and protons, measure the CKM matrix element Vud, and conduct precision low energy tests of physics beyond the Standard Model. The aCORN experiment uses a novel “wishbone asymmetry” method that does not require detailed proton spectroscopy to measure the neutron a-coefficient The first aCORN run in 2013–2014 produced the most precise measurement to date. The second run in 2015–2016 on the new high-flux beamline NG-C at the NIST Center for Neutron Research collected a ten-times larger data set. Details of the experiment and results from the NG-C run will be presented. |
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