Precise Measurements of the Decay of Free Neutrons

Abstract

The impact of new and highly precise neutron \b{eta} decay data is reviewed. We focus on recent results from neutron lifetime, \b{eta} asymmetry, and electron-neutrino correlation experiments. From these results, weak interaction parameters are extracted with unprecedented precision, possible also due to 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.

arXiv comment34 pages, 4 figures

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• Neutron Stars with Baryon Number Violation, Probing Dark Sectors
• Particle Physics at the European Spallation Source
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• The Standard Model theory of neutron beta decay
• Neutron Dark Decay
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• Opportunities and open questions in modern $\beta$ decay
• Search for a neutron dark decay in ${}^6$He
• Probing Dark Sectors with Neutron Stars
• A Ramsey Neutron-Beam Experiment to Search for Ultralight Axion Dark Matter at the ESS
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• Neutron-neutral particle mixing and its observable consequences
• A non-depolarizing CuTi neutron supermirror guide for PERC
• Detection of molecular hydrogen in a neutron beam lifetime experiment
• Study of silicon photomultipliers for use in neutron decay experiments