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北美退伍军人节(Veterans Day),12 日无更新
arXiv 0710.1647hep-ex
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B_s在Belle衰变

B_s decays at Belle

A. Drutskoy

摘要:

我们报告了最近在KEKB非对称能量e^+ e^-对撞机上用Belle探测器在Y(5S)共振上收集的23.6 fb^{-1}数据样本获得的结果。首次研究了包含半轻子B_s^0 -> X^+ l^- ν衰变,并测量了分支分数.结合电子和μ子通道,我们得到Bf(B_s^0 -> X^+ l^- ν)=(10.2 \pm 0.8 \pm 0.9)%.首次观测到辐射企鹅衰变B_s^0 -> γ,并得到了改进的B_s^0 \to γγ的上限.

英文摘要:

We report recent results obtained with the Belle detector using a 23.6 fb^{-1} data sample collected on the Y(5S) resonance at the KEKB asymmetric energy e^+ e^- collider. Inclusive semileptonic B_s^0 -> X^+ l^- νdecays are studied for the first time and the branching fraction is measured. Combining the electron and muon channels, we obtain Bf(B_s^0 -> X^+ l^- ν) = (10.2 \pm 0.8 \pm 0.9)%. Also, the radiative penguin decay B_s^0 -> ϕγis observed for the first time, and an improved upper limit for the decay B_s^0 \to γγis obtained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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