1932

Abstract

A new generation of experiments is studying muon capture on hydrogen, deuterium, and 3He with significantly improved precision using a novel active-target method. At the same time, chiral effective field theories (EFTs) allow the calculation of low-energy electroweak observables on protons and the simplest nuclei within a rigorous quantum chromodynamics (QCD)-based framework. This experimental and theoretical progress significantly enhances our understanding of the axial current. In the case of the nucleon, the unambiguous experimental determination of the pseudoscalar coupling clarifies a long-standing puzzle and provides a basic test of QCD at low energies. In the case of deuterium and 3He, the new precision data allow a comprehensive test of EFT calculations of weak few-body reactions and determine an essential low-energy constant relevant for related astrophysics reactions of fundamental interest.

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/content/journals/10.1146/annurev-nucl-100809-131946
2010-11-23
2024-05-21
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  • Article Type: Review Article
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