Electroweak radiative corrections to b --> s gamma
High Energy Physics - Phenomenology
2009-10-31 v2
Abstract
Two loop electroweak corrections to b --> s gamma decays are computed. Fermion and photonic loop effects are found to reduce R = BR(b --> s gamma)/BR(b --> c e nu) by 8+-2% and lead to the standard model prediction BR(B --> X_s gamma)=(3.28 +- 0.30)x10^-4 for inclusive B meson decays. Comparison of R^{theory} =(3.04 +- 0.25)x10^-3(1+0.10rho), where rho is a Wolfenstein CKM parameter, with the current experimental average R^{exp}=(2.52+-0.52)x10^-3 gives rho=-1.7+-1.9 which is consistent with -0.21<rho<0.27 obtained from other B and K physics constraints.
Keywords
Cite
@article{arxiv.hep-ph/9804252,
title = {Electroweak radiative corrections to b --> s gamma},
author = {Andrzej Czarnecki and William J. Marciano},
journal= {arXiv preprint arXiv:hep-ph/9804252},
year = {2009}
}
Comments
updated version, to appear in Phys. Rev. Lett