University of Melbourne, School of Physics, Victoria 3010.
Phys Rev Lett. 2009 Dec 11;103(24):241801. doi: 10.1103/PhysRevLett.103.241801. Epub 2009 Dec 7.
Using 605 fb(-1) of data collected at the Upsilon(4S) resonance we present a measurement of the inclusive radiative B-meson decay channel, B-->X(s)gamma. For the lower photon energy thresholds of 1.7, 1.8, 1.9, and 2.0 GeV, as defined in the rest frame of the B meson, we measure the partial branching fraction and the mean and variance of the photon energy spectrum. At the 1.7 GeV threshold we obtain the partial branching fraction BF(B-->X(s)}gamma)=(3.45+/-0.15+/-0.40)x10(-4), where the errors are statistical and systematic.
利用在Upsilon(4S)共振处收集的 605 fb(-1)数据，我们呈现了对 inclusive radiative B-meson 衰变道 B-->X(s)gamma 的测量结果。对于在 B 介子的静止系中定义的更低的光子能量阈值 1.7、1.8、1.9 和 2.0 GeV，我们测量了部分分支比以及光子能谱的平均值和方差。在 1.7 GeV 阈值处，我们得到部分分支比 BF(B-->X(s)gamma)=(3.45+/-0.15+/-0.40)x10(-4)，其中误差是统计和系统的。
