Electroweak Radiative Corrections to Muon Capture
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
Electroweak radiative corrections to muon capture on nuclei are computed and found to be sizable. They enhance the capture rates for hydrogen and helium by 2.8% and 3.0% respectively. As a result, the value of the induced pseudoscalar coupling, g_P^exp, extracted from a recent hydrogen 1S singlet capture experiment is increased by about 21% to g_P^exp = 7.3 +/- 1.2 and brought into good agreement with the prediction of chiral perturbation theory, g_P^theory=8.2 +/- 0.2. Implications for helium capture rate predictions are also discussed.
Cite
@article{arxiv.0704.3968,
title = {Electroweak Radiative Corrections to Muon Capture},
author = {A. Czarnecki and W. J. Marciano and A. Sirlin},
journal= {arXiv preprint arXiv:0704.3968},
year = {2008}
}