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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2006 Oct 27;97(17):171803. doi: 10.1103/PhysRevLett.97.171803. Epub 2006 Oct 24.
The photon spectrum in B-->Xs gamma decay, where Xs is any strange hadronic state, is studied using a data sample of 88.5 x 10(6) e+ e- --> Upsilon(4S) --> BB decays collected by the BABAR experiment at the Stanford Linear Accelerator Center. The partial branching fraction, DeltaB(B --> Xs gamma) = (3.67+/-0.29(stat)+/-0.34(syst)+/-0.29(model)) x 10(-4), the first moment
利用斯坦福直线加速器中心的BABAR实验收集的88.5×10⁶个e⁺e⁻→Υ(4S)→BB衰变的数据样本，研究了B→Xsγ衰变中的光子能谱，其中Xs为任何奇异强子态。测量了光子能量范围1.9 GeV < Eγ < 2.7 GeV时的部分分支比ΔB(B→Xsγ)=(3.67±0.29(统计)±0.34(系统)±0.29(模型))×10⁻⁴、第一矩<Eγ>=2.288±0.025±0.017±0.015 GeV以及第二矩E²(γ)=0.0328±0.0040±0.0023±0.0036 GeV²。还对更窄的Eγ范围进行了测量。然后将这些矩与最新的理论计算进行拟合，以提取重夸克展开参数m(b)和μ²(π)，并将部分分支比外推到Eγ > 1.6 GeV。此外，测得直接CP不对称性A(CP)(B→X(s+d)γ)为-0.110±0.115(统计)±0.017(系统)。
