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arXiv 1607.04857hep-phhep-ex
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$B \to K^{(*)} \ell^+ \ell^-$和μ子$g-2$的解释，以及在LHC的意义

Explanation of $B \to K^{(*)} \ell^+ \ell^-$ and muon $g-2$, and implications at the LHC

Chuan-Hung Chen, Takaaki Nomura, Hiroshi Okada

备注：
18 pages, 3 figures, 1 table, version accepted by Phys. Rev. D
发表信息：
Phys. Rev. D 94, 115005 (2016)
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摘要：

在$B\to K^* μ^+ μ^-$和μ子$g-2$的角可观测$P'_5$中，观察到超过$3σ$偏离标准模型。为了解决这些异常，我们扩展了标准模型，增加了两个leptoquark。结果发现，双光子希格斯衰变的信号强度可以表现出一个显着的偏离单位，是在数据误差。虽然$\ell_i \to \ell_j γ$对某些耦合提出了严格的限制，但发现$P'_5$和μ子$g-2$的过剩仍然可以解释，并且可以适应于该模型中对$B_s\to μ^+ μ^-$的测量。此外，轻夸克效应也可以解释$R_K = BR(B^+ \to K^+ μ^+μ^-)/BR(B^+ \to K^+ e^+e^-)=0.745^{+0.090}_{-0.074} \pm 0.036$的LHCb测量，它显示了与标准模型预测的$2.6σ$偏差。

英文摘要：

More than $3σ$ deviations from the standard model are observed in the angular observable $P'_5$ of $B\to K^* μ^+ μ^-$ and muon $g-2$. To resolve these anomalies, we extend the standard model by adding two leptoquarks. It is found that the signal strength of the diphoton Higgs decay can exhibit a significant deviation from unity and is within the data errors. Although $\ell_i \to \ell_j γ$ puts severe bounds on some couplings, it is found that the excesses of $P'_5$ and muon $g-2$ can still be explained and can be accommodated to the measurement of $B_s\to μ^+ μ^-$ in this model. In addition, the leptoquark effects can also explain the LHCb measurement of $R_K = BR(B^+ \to K^+ μ^+μ^-)/BR(B^+ \to K^+ e^+e^-)=0.745^{+0.090}_{-0.074} \pm 0.036$, which shows a $2.6σ$ deviation from the standard model prediction.

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