Bulletin of the American Physical Society
2012 Fall Meeting of the APS Division of Nuclear Physics
Volume 57, Number 9
Wednesday–Saturday, October 24–27, 2012; Newport Beach, California
Session HA: Precision Measurement and Novel Approaches to Neutron Decay |
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Chair: Jeffrey Nico, NIST Room: Plaza I |
Friday, October 26, 2012 8:30AM - 9:06AM |
HA.00001: Lattice-QCD Inputs for Probing TeV-Scale Physics in Ultra-Cold Neutron Beta Decays Invited Speaker: Huey-Wen Lin Precision measurements of the low-energy nucleon sector provide constraints on the Standard Model and can discern the signatures predicted for particles beyond the Standard Model. In the case of neutron beta decay, new TeV-scale particles can be probed through operators that couple to the nucleon isovector scalar and tenor charges. Lattice QCD can provide the most accurate low-energy nucleon matrix elements to relate ultra-cold neutron experiments to constraints on potential new particles. I present both constraints in the low-energy sector and compare with current and near-future limits from the LHC. [Preview Abstract] |
Friday, October 26, 2012 9:06AM - 9:42AM |
HA.00002: UCNA: New results for the neutron beta decay asymmetry Invited Speaker: Michael Mendenhall The UCNA experiment uses bottled polarized ultracold neutrons (UCN) to measure the neutron beta decay asymmetry $A(E)$. In the Standard Model, $A_0$ is function of the axial-vector to vector coupling ratio $\lambda \equiv g_{\rm A}/g_{\rm V}$, providing a systematically independent complement to the physics probed by measurements of the neutron lifetime $\tau_{\rm n}$ and CKM matrix element $V_{\rm ud}$. This talk presents an overview of the UCNA experiment, the results from the analysis of our 2010 dataset, and a look at work currently underway toward a more precise measurement. [Preview Abstract] |
Friday, October 26, 2012 9:42AM - 10:18AM |
HA.00003: Beta Decay for Studies of CP Violation Invited Speaker: Susan Gardner The triple-product correlations observable in ordinary neutron or nuclear beta decay are all naively T violating and can connect, through an assumption of CPT invariance, to constraints on sources of CP violation beyond the Standard Model (SM). They are also spin dependent. I will review the constraints such studies offer on physics beyond the SM, and the manner in which they complement constraints from the nonobservation of permanent electric dipole moments. In this context the study of radiative beta decay opens a new possibility, in that a triple-product correlation can be constructed from momenta alone. Consequently its measurement would constrain new spin-independent sources of CP violation. I will describe these, and the implications of possible experimental constraints, in light of the size of the triple momentum correlation in the radiative decay rate arising from electromagnetic final-state interactions in the SM. [Preview Abstract] |
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