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arXiv 1010.2229hep-ex
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衰变B^0 -> gamma γ的研究

A Search for the Decay B^0 -> gamma gamma

The BABAR Collaboration, P. del Amo Sanchez et al

摘要:

我们报告了在426 fb-1的数据中搜索稀有衰变B^0 -> gamma的结果,对应于2.26亿个B^0 \bar{B}^0对,这些数据是使用BABAR探测器在PEP-II非对称能量e+e-对撞机的Uppersonal(4S)共振上收集的。我们使用极大似然拟合来提取信号产额,并观察到统计显著性为1.9 sigma的21^{+13}_{-12}个信号事件。这对应于分支分数B(B^0 -> gamma gamma)=(1.7 +- 1.1(stat.)+- 0.2(系统))x 10^-7。基于这一结果,我们将90%置信水平的上限设为B(B^0 -> gamma gamma)< 3.3 x 10^-7。

英文摘要:

We report the result of a search for the rare decay B^0 -> gamma gamma in 426 fb-1 of data, corresponding to 226 million B^0 \bar{B}^0 pairs, collected on the Upsilon(4S) resonance at the PEP-II asymmetric-energy e+e- collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 21^{+13}_{-12} signal events with statistical significance of 1.9 sigma. This corresponds to a branching fraction B(B^0 -> gamma gamma) = (1.7 +- 1.1(stat.) +- 0.2(syst.)) x 10^-7. Based on this result, we set a 90% confidence level upper limit of B(B^0 -> gamma gamma) < 3.3 x 10^-7.

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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