Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
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DOI：
10.1103/physrevlett.98.022002
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发表时间：
2006-09
影响因子：
8.6
通讯作者：
M. Misiak;H. Asatrian;K. Bieri;M. Czakon;A. Czarnecki;T. Ewerth;A. Ferroglia;P. Gambino;M. Gorbahn;C. Greub;U. Haisch;A. Hovhannisyan;T. Hurth;A. Mitov;Poghosyan;M. Ślusarczyk;M. Steinhauser
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文献类型：
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作者：
M. Misiak;H. Asatrian;K. Bieri;M. Czakon;A. Czarnecki;T. Ewerth;A. Ferroglia;P. Gambino;M. Gorbahn;C. Greub;U. Haisch;A. Hovhannisyan;T. Hurth;A. Mitov;Poghosyan;M. Ślusarczyk;M. Steinhauser
结合我们对弱辐射B介子衰变的各种O（α_s^2）修正的结果，我们能够给出QCD中次-次-首阶分支比的第一个估计。在B介子静止系中，当E_gamma > 1.6 GeV时，我们发现BR（B -> X_s gamma）=（3.15 +_ 0.23）x 10^-4.四种不确定度：非摄动不确定度（5%）、参数不确定度（3%）、高阶不确定度（3%）和mc插值模糊度（3%）被正交相加以获得总误差。
Combining our results for various O(alpha_s^2) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find BR(B -> X_s gamma) = (3.15 +_ 0.23) x 10^-4 for E_gamma > 1.6 GeV in the B-meson rest frame. The four types of uncertainties: non-perturbative (5%), parametric (3%), higher-order (3%) and m_c-interpolation ambiguity (3%) have been added in quadrature to obtain the total error.