Journal
ANNUAL REVIEW OF NUCLEAR AND PARTICLE SCIENCE, VOL 71, 2021
Volume 71, Issue -, Pages 139-163Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-nucl-102419-043156
Keywords
cold neutrons; ultracold neutrons; beta decay; weak interaction; beyond the Standard Model; CKM unitarity; effective field theory
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Funding
- German Research Foundation (DFG) [SPP 1491]
- Excellence Cluster ORIGINS - DFG under Germany's Excellence Strategy [EXC 2094, 390783311]
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The impact of new and highly precise neutron beta decay data is significant in extracting weak interaction parameters and setting limits on New Physics beyond the Standard Model.
The impact of new and highly precise neutron beta decay data is reviewed. We focus on recent results from neutron lifetime, beta asymmetry, and electron-neutrino correlation experiments. From these results, weak interaction parameters are extracted with unprecedented precision, which is possible also because of progress in effective field theory and lattice QCD. Limits on New Physics beyond the Standard Model derived from neutron decay data are sharper than those derived from high-energy experiments, except for processes involving right-handed neutrinos.
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