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arXiv · hep-ph/0610067

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

Thomas Becher·Matthias Neubert
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Abstract

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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Thomas Becher, Matthias Neubert. 2006-10-05. Analysis of Br(B-->X_s gamma) at NNLO with a Cut on Photon Energy. https://doi.org/10.1103/physrevlett.98.022003

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