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arXiv 1604.04263hep-ex
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利用ATLAS探测器在LHC Run 1期间收集的数据研究B^0_s和B^0到μ子对的稀有衰变

Study of the rare decays of $B^0_s$ and $B^0$ into muon pairs from data collected during the LHC Run 1 with the ATLAS detector

ATLAS Collaboration

AI总结:

本文利用ATLAS探测器在LHC Run 1期间收集的25 fb^{-1}质子-质子碰撞数据,研究B^0和B^0_s到μ子对的稀有衰变,给出B^0分支比上限并首次测得B^0_s分支比,结果与标准模型一致。

摘要:

利用ATLAS探测器在LHC Run 1期间收集的积分亮度为25 fb^{-1}的7 TeV和8 TeV质子-质子碰撞数据,对衰变B^0→μ^+μ^-和B^0_s→μ^+μ^-进行了研究。对于B^0,在95%置信水平下给出分支比上限为B(B^0→μ^+μ^-) < 4.2×10^{-10}。对于B^0_s,测得分支比为B(B^0_s→μ^+μ^-) = (0.9^{+1.1}_{-0.8})×10^{-9}。结果与标准模型预期一致,p值为4.8%,对应2.0个标准偏差。

英文摘要:

A study of the decays $B^0\to μ^+μ^-$ and $B^0_s\to μ^+μ^-$ has been performed using data corresponding to an integrated luminosity of $25$ fb$^{-1}$ of $7$ TeV and $8$ TeV proton--proton collisions collected with the ATLAS detector during the LHC Run 1. For $B^0$, an upper limit on the branching fraction is set at ${\cal B}(B^0 \to μ^+μ^-) < 4.2 \times 10^{-10}$ at $95\%$ confidence level. For $B^0_s$, the branching fraction ${\cal B}(B^0_s \to μ^+μ^-) = \left( 0.9^{+1.1}_{-0.8} \right) \times 10^{-9}$ is measured. The results are consistent with the Standard Model expectation with a $p$-value of $4.8\%$, corresponding to $2.0$ standard deviations.

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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