Comprehensive analysis of beta decays within and beyond the Standard Model

Abstract

Precision measurements in allowed nuclear beta decays and neutron decay are reviewed and analyzed both within the Standard Model and looking for new physics. The analysis incorporates the most recent experimental and theoretical developments. The results are interpreted in terms of Wilson coefficients describing the effective interactions between leptons and nucleons (or quarks) that are responsible for beta decay. New global fits are performed incorporating a comprehensive list of precision measurements in neutron decay, superallowed $0^{+}\to 0^{+}$ transitions, and other nuclear decays that include, for the first time, data from mirror beta transitions. The results confirm the $V$-$A$ character of the interaction and translate into updated values for $V_{ud}$ and $g_A$ at the $10^{-4}$ level. We also place new stringent limits on exotic couplings involving left-handed and right-handed neutrinos, which benefit significantly from the inclusion of mirror decays in the analysis.

arXiv comment35 pages; v2: analysis updated, comments and references added; v3: compared to the JHEP version, typos in Eqs. 2.1, A3, A4 corrected, Eq. 4.4 updated, comment on aCORN update added in footnote 12

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• Particle Physics at the European Spallation Source
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• EFT analysis of New Physics at COHERENT
• Precise Measurements of the Decay of Free Neutrons
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• Mapping the SMEFT to discoverable models
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• Renormalization of beta decay at three loops and beyond
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• Magnetic structure of $A\le 10$ nuclei using the Norfolk nuclear models with quantum Monte Carlo methods
• Unleashing the Power of EFT in Neutrino-Nucleus Scattering
• The HIBEAM Instrument at the European Spallation Source
• Translationally invariant matrix elements of general one-body operators
• On the sensitivity of the D parameter to new physics
• Effective field theory in light of relative entropy
• Precision pulse shape simulation for proton detection at the Nab experiment
• The Role of Ab Initio Beta-Decay Calculations in Light Nuclei for Probes of Physics Beyond the Standard Model
• Study of silicon photomultipliers for use in neutron decay experiments
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• Round table on Standard Model Anomalies
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