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arXiv 1201.5359hep-ex
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LHCb的稀有衰变

Rare Decays in LHCb

Diego Martinez Santos

摘要:

利用\lhcb实验在2010年和2011年收集的\sqrt{s} = 7 TeV的pp碰撞的高达0.41 fb^{-1}的\sim研究了稀有B衰变Bs(d)-->μμ、B-->K*μμ和Bs--> γ。用0.41 fb^{-1}搜索衰变Bs(d)->μμ。在95%置信水平下,不存在显著信号导致BR(Bs-->μμ<1.4 x 10^{-8}和BR(Bd-->μμ<3.2 x 10^{-9}。在0.31 fb^{-1}范围内测量了前后向不对称性、纵向极化分数和B->K*μμ的微分分支分数随双μ子不变质量的变化。用0.34 fb ^{-1}测量了辐射B衰变B--> K*γ和Bs--> K * γh的分支比。获得的比值为1.52 \pm 0.14(统计)\pm 0.10(系统)\pm 0.12(f_s/f_d)。使用BR(Bd --> K^*γ)的HFAG值,发现BR(Bs--> K^*γ)为(2.8 \pm 0.5)\times 10^{-5}。

英文摘要:

The rare B decays Bs(d)-->μμ, B-->K*μμand Bs-->ϕγare studied using up to \sim 0.41 fb^{-1} of pp collisions at \sqrt{s} = 7 TeV collected by the \lhcb experiment in 2010 and 2011. A search for the decays Bs(d)-->μμ, is performed with 0.41 fb^{-1} . The absence of significant signal leads to BR(Bs-->μμ<1.4 x 10^{-8} and BR(Bd-->μμ<3.2 x 10^{-9} at 95% confidence level. The forward-backward asymmetry, fraction of longitudinal polarization and differential branching fraction of B-->K*μμ, as a function of dimuon invariant mass, are measured in 0.31 fb^{-1}. The ratio of branching ratios of the radiative B decays B--> K*γand Bs-->ϕγh as been measured using 0.34fb^{-1}. The obtained value for the ratio is 1.52 \pm 0.14 (stat) \pm 0.10 (syst) \pm 0.12 (f_s/f_d). Using the HFAG value for BR(Bd --> K^*γ), BR(Bs-->ϕγ) has been found to be (2.8 \pm 0.5)\times 10^{-5}.

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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