Analysis of B((B)over-bar→Xsγ) at next-to-next-to-leading order with a cut on photon energy
Analysis of B((B)over-bar→Xsγ) at next-to-next-to-leading order with a cut on photon energy
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DOI：
10.1103/physrevlett.98.022003
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发表时间：
2007-01-12
影响因子：
8.6
通讯作者：
Neubert, Matthias
中科院分区：
文献类型：
--
作者：
Becher, Thomas;Neubert, Matthias
通过结合最近对bar -> X-s γ分支分数的总（B）的估计和对截断E-γ ≥ 1.6GeV对光子能量影响的详细分析，得到了在重整化群改进微扰理论中对bar -> X-s γ分支分数的次首级部分（B）的预测，其中来自所有相关尺度的贡献被因子分解。结果B（（B）除以bar -> X-s gamma）=（2.98 +/- 0.26）x 10（-4）比实验世界平均值低约1.4 sigma。这为在罕见的辐射B衰变中做出重要的新物理贡献打开了一扇窗。
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.