期刊
PHYSICAL REVIEW LETTERS
卷 98, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.022003
关键词
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By combining a recent estimate of the total (B) over bar -> X-s gamma branching fraction at O(alpha(2)(s)) with a detailed analysis of the effects of a cut E-gamma >= 1.6 GeV on photon energy, a prediction for the partial (B) over bar -> 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 factorized. The result B((B) over bar -> X-s gamma)=(2.98 +/- 0.26) x 10(-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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