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arXiv 1409.0445hep-ex
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CMS的$B^0_{(s)} \rightarrow μ^+μ^-$

$B^0_{(s)} \rightarrow μ^+μ^-$ at CMS

Franco Ligabue

摘要:

简要回顾了2011年和2012年在LHC收集到的$\sqrt s = 7$ ~GeV和$\sqrt s = 8$ ~GeV pp碰撞中罕见的\BMuMu和\BsMuMu衰变的搜寻工作。CMS分析的数据分别对应于5和20 $\rm fb^{-1}$的总积分光度。根据标准模型预测,时间积分平均分支分数$\left<{\mathcal B }( { B^{0}_{s}\rightarrow μ^+μ^-} )\right>$已测量为$(3.0 ^{+1.0}_{-0.9})\times 10^{-9}$,而另一个研究的衰变在95%CL下设定了上限$\left<{ \mathcal B }( B^{0}\rightarrow μ^+μ^-)\right> < 1.1\times 10^{-9}) $。初步结合LHCb的结果也提出了两个通道,并对未来的前景进行了简要讨论。

英文摘要:

The search for the rare \BMuMu and \BsMuMu decays in pp collisions at $\sqrt s = 7$~GeV and $\sqrt s = 8$~GeV, collected at the LHC in 2011 and 2012, is briefly reviewed. The data analyzed by CMS correspond to a total integrated luminosity of 5 and 20 $\rm fb^{-1}$, respectively. The time-integrated average branching fraction $\left<{\mathcal B }( { B^{0}_{s}\rightarrow μ^+μ^-} )\right>$ has been measured to be $(3.0 ^{+1.0}_{-0.9})\times 10^{-9}$ in accordance with the Standard Model predictions, while an upper limit $\left<{ \mathcal B }( B^{0}\rightarrow μ^+μ^-)\right> < 1.1\times 10^{-9}) $ has been placed on the other investigated decay at 95% CL. A preliminary combination with the results from LHCb is also presented for both channels, and prospects for the future are briefly discussed.

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