Electroweak radiative corrections to b --> s gamma

Details Electroweak radiative corrections to b --> s gamma Electroweak radiative corrections to b --> s gamma

1998-04-07

arxiv.org/abs/hep-ph/9804252v2

Phys.Rev.Lett. 81 (1998) 277-280

Physics

High Energy Physics

High Energy Physics - Phenomenology

updated version, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.81.277

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

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