Analysis of Br(B-->X_s gamma) at NNLO with a Cut on Photon Energy

Details Analysis of Br(B-->X_s gamma) at NNLO with a Cut on Photon Energy Analysis of Br(B-->X_s gamma) at NNLO with a Cut on Photon Energy

2006-10-05

arxiv.org/abs/hep-ph/0610067v1

Phys.Rev.Lett.98:022003,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.98.022003

By combining a recent estimate of the total B-->X_s gamma branching fraction at O(alpha_s^2) with a detailed analysis of the effects of a cut E_gamma>1.6GeV on photon energy, a prediction for the partial B-->X_s gamma branching fraction at next-to-next-to-leading order in renormalization-group improved perturbation theory is obtained, in which contributions from all relevant scales are properly factorized. The result Br(B-->X_s gamma)=(2.98+-0.26)x10^{-4} is about 1.4 sigma lower than the experimental world average. This opens a window for significant New Physics contributions in rare radiative B decays.

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