Sharpening Low-Energy, Standard-Model Tests via Correlation Coefficients in Neutron Beta-Decay

Preprint

30 April 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/0012098

Abstract

The correlation coefficients a, A, and B in neutron beta-decay are proportional to the ratio of the axial-vector to vector weak coupling constants, g_A/g_V, to leading recoil order. With the advent of the next generation of neutron decay experiments, the recoil-order corrections to these expressions become experimentally accessible, admitting a plurality of Standard Model (SM) tests. The measurement of both a and A, e.g., allows one to test the conserved-vector-current (CVC) hypothesis and to search for second-class currents (SCC) independently. The anticipated precision of these measurements suggests that the bounds on CVC violation and SCC from studies of nuclear beta-decay can be qualitatively bettered. Departures from SM expectations can be interpreted as evidence for non-V-A currents.

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All Related Versions

Version 1, 2000-12-08, ArXiv
Version 2, 2000-12-10, ArXiv
Version 3, 2001-04-30, ArXiv
Published version: Physical Review Letters, 86 (25), 5666.

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