Pion-induced radiative corrections to neutron beta-decay
Abstract
We compute the electromagnetic corrections to neutron beta decay using a low-energy hadronic effective field theory. We identify and compute new radiative corrections arising from virtual pions that were missed in previous studies. The largest correction is a percent-level shift in the axial charge of the nucleon proportional to the electromagnetic part of the pion-mass splitting. Smaller corrections, comparable to anticipated experimental precision, impact the - angular correlations and the -asymmetry. We comment on implications of our results for the comparison of the experimentally measured axial charge with first-principle computations using lattice QCD and on the potential of -decay experiments to constrain beyond-the-Standard-Model interactions.
Keywords
Cite
@article{arxiv.2202.10439,
title = {Pion-induced radiative corrections to neutron beta-decay},
author = {Vincenzo Cirigliano and Jordy de Vries and Leendert Hayen and Emanuele Mereghetti and André Walker-Loud},
journal= {arXiv preprint arXiv:2202.10439},
year = {2022}
}