Testing leptoquark and Z′ models via B→K1(1270,1400)μ+μ− decays
Testing leptoquark and Z′ models via B→K1(1270,1400)μ+μ− decays
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DOI：
10.1103/physrevd.100.055038
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发表时间：
2018-12
影响因子：
5
通讯作者：
Zhuo-Ran Huang;M. Paracha;I. Ahmed;C. Lu
中科院分区：
文献类型：
--
作者：
Zhuo-Ran Huang;M. Paracha;I. Ahmed;C. Lu
的测量 $R_{K^{(*)}}=\mathcal B(B\to K^{(*)}\mu^{+}\mu^{-})/\mathcal B(B\to K^{(*)}e^{+}e^{-})$ 近年来轻子味非普适性的提示引起了广泛关注。如果这些异常是由新物理学（NP）引起的，那么在其他通道中也可以通过相同的过程在夸克水平上发现与SM预测的偏差。在这项工作中，我们学习 $B\to K_{1}(1270,1400)\mu^{+}\mu^{-}$ 衰减了两种流行的NP模型的效果，这两种模型可以解决 $b\to s$ 异常，即轻夸克模型和 $Z^{\prime}$ 模型。假设NP只影响 $b\to s\mu^+\mu^-$ 跃迁时，我们发现了非极化和极化轻子风味普适比（LFU） $R_{K_1^{(L,T)}(1270)}$ 是否有助于区分NP模型（情景）和SM，因为它们对NP效应敏感，而对混合角不敏感 $\theta_{K_1}$，而 $R_{K_1^{(L,T)}(1400)}$ 对NP和 $\theta_{K_1}$。另一个比率 $R_\mu(K_1)=\mathcal B(B\to K_1(1400)\mu^+\mu^-)/\mathcal B(B\to K_1(1270)\mu^+\mu^-)$ 每周取决于所考虑的NP模型（情景）的影响，因此可以用来确定 $\theta_{K_1}$ 并补充 $R_{K_1^{(L,T)}}$ 在探查NP中。
The measurements of $R_{K^{(*)}}=\mathcal B(B\to K^{(*)}\mu^{+}\mu^{-})/\mathcal B(B\to K^{(*)}e^{+}e^{-})$ in recent years have hinted lepton flavor non-universality and thus drawn widespread attentions. If these anomalies are induced by new physics (NP), deviations from the SM predictions may also be found in other channels via the same process at the quark level. In this work, we study in $B\to K_{1}(1270,1400)\mu^{+}\mu^{-}$ decays the effects of two popular classes of NP models which can address the $b\to s$ anomalies, i.e. the leptoquark models and the $Z^{\prime}$ models. By assuming that NP only affects the $b\to s\mu^+\mu^-$ transition, we find that the unpolarized and polarized lepton flavor universality (LFU) ratios $R_{K_1^{(L,T)}(1270)}$ are useful to distinguish among the NP models (scenarios) and the SM because they are sensitive to the NP effects and insensitive to the mixing angle $\theta_{K_1}$, while the $R_{K_1^{(L,T)}(1400)}$ are sensitive to both NP and $\theta_{K_1}$. Another ratio $R_\mu(K_1)=\mathcal B(B\to K_1(1400)\mu^+\mu^-)/\mathcal B(B\to K_1(1270)\mu^+\mu^-)$ is shown to depend weekly on the effects from the NP models (scenarios) under consideration, and thus can be used to determine the $\theta_{K_1}$ and complement the $R_{K_1^{(L,T)}}$ in the probe for NP.