Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session Q04: BSM Physics in Nuclear and Neutron Beta DecayInvited Live
|
Hide Abstracts |
Sponsoring Units: DNP Chair: Nadia Fomin, University of Tennessee Room: Washington 3 |
Monday, April 20, 2020 10:45AM - 11:21AM Live |
Q04.00001: Radiative Corrections in Neutron and Nuclear Decay Invited Speaker: Chien Yeah Seng I will describe a series of recent developments in the study of radiative corrections in neutron and super-allowed nuclear beta decay and their implications on searches of BSM physics on the precision frontier, including an interesting tension in the first-row CKM unitarity. Possible routes for future improvements will also be discussed. [Preview Abstract] |
Monday, April 20, 2020 11:21AM - 11:57AM Live |
Q04.00002: New results from the UCN$\tau$ experiment Invited Speaker: Daniel Salvat A precise determination of the neutron lifetime $\tau_{n}$, when combined with other neutron $\beta$-decay observables, provides a stringent test of the standard model. The UCN$\tau$ experiment at the Los Alamos Neutron Science Center (LANSCE) uses a magneto-gravitational neutron trap to confine ultracold neutrons (UCN) without loss due to material interactions prevalent in previous UCN bottle experiments. The experiment uses a novel \textit{in situ} detector to count UCN at different locations within the trap. These features allowed us to perform the first measurement of $\tau_{n}$ with systematic corrections no larger than the associated uncertainties. Since reporting this measurement in 2018, we have acquired enough data to achieve $\sim 0.3$ s statistical uncertainty. Further, we implemented a UCN buffer volume between the LANSCE UCN source and the apparatus, allowing us to better normalize the number of neutrons loaded into the trap. I will discuss the improved UCN$\tau$ experiment and present new results from data acquired in 2017 and 2018. [Preview Abstract] |
Monday, April 20, 2020 11:57AM - 12:33PM Live |
Q04.00003: A Survey of Nuclear Experimental Results Towards a Vud Extraction Invited Speaker: Maxime Brodeur Despite its success, the Standard Model (SM) has several shortcomings leading to its scrutinization at the energy, intensity and precision frontier. One probing mechanism for new physics is the unitarity test of the Cabibbo-Kobayashi-Maskawa quark mixing matrix, which up to until recently has followed the SM-predicted unitarity. However, recent radiative correction calculation results, used for the determination of the biggest matrix element, Vud, now generates approximately three standards deviation of tension with unitarity, leading to renewed interest on the experimental and theoretical fronts. A survey of various recent experimental results as well as future plans for a more precise and accurate determination of $V_{ud}$ from superallowed pure Fermi and mixed beta decay transitions will be presented. [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