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arXiv 1806.00636hep-ex
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$\sqrt{s} =$ 8 TeV质子-质子碰撞中衰变B $\to$ K $^+μ^+μ^-$的角分析

Angular analysis of the decay B$^+$ $\to$ K$^+μ^+μ^-$ in proton-proton collisions at $\sqrt{s} =$ 8 TeV

CMS Collaboration

摘要:

研究了质心能量为8 TeV的质子-质子碰撞中变味中性流衰变B $^+$ $\to$ K $^+μ^+μ^-$的角分布.该分析是基于在大型强子对撞机上用CMS探测器收集的数据,对应于20.5 fb $^{-1}$的积分光度。测量了双μ子系统的前后向不对称性$A_{\mathrm{FB}}$和赝标、标量和张量振幅对衰变宽度的贡献$F_{\mathrm{H}}$随双μ子质量平方的变化。测量结果与标准模型的预期一致。

英文摘要:

The angular distribution of the flavor-changing neutral current decay B$^+$ $\to$ K$^+μ^+μ^-$ is studied in proton-proton collisions at a center-of-mass energy of 8 TeV. The analysis is based on data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 20.5 fb$^{-1}$. The forward-backward asymmetry $A_{\mathrm{FB}}$ of the dimuon system and the contribution $F_{\mathrm{H}}$ from the pseudoscalar, scalar, and tensor amplitudes to the decay width are measured as a function of the dimuon mass squared. The measurements are consistent with the standard model expectations.

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