Chien-Yeah Seng, FRIB, Michigan State University and University of Washington
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Abstract: Beta decays of neutrons and nuclei are exemplary low-energy experiments at the precision frontier that provide stringent tests of the Standard Model (SM) and probe physics beyond the Standard Model (BSM). Isolating signals of new physics from the SM background requires a precise understanding of all higher-order corrections, including radiative corrections (RC). However, this extremely challenging as such corrections often involve hadronic and nuclear physics in the non-perturbative regime.
In this talk, I will describe our pioneering efforts to determine RC to neutron and nuclear beta decays through a collaborative approach involving new theoretical frameworks, lattice QCD, nuclear many-body calculations, and experimental data. Our work has led to impactful findings, including the evidence of a violation of the Cabibbo-Kobayashi-Maskawa (CKM) matrix unitarity which may point toward new physics. I will also outline potential avenues for further progress in this field.
PAS 236 @ 2:00 PM - 3:30 PM