$b\to s\ell_1\ell_2$模中轻子味破坏的轻夸克方案
Palatable Leptoquark Scenarios for Lepton Flavor Violation in Exclusive $b\to s\ell_1\ell_2$ modes
摘要：
我们研究各种方案，涉及轻${\cal O}(1 TeV)$ leptoquark状态，并选择那些与当前的实验值$\mathcal{B}(B_s\to μμ)$，$\mathcal{B}(B\to Kμμ)_{\mathrm{large}-q^2}$，$R_K=\mathcal{B^\prime}(B\to Kμμ)/\mathcal{B^\prime}(B\to Kee)$兼容，并导致与其他实验数据一致的预测。我们证明了两个这样的方案是现象学上合理的，即一个与超荷$1/6$的标量轻夸克的二重态，和一个与超荷$2/3$的矢量轻夸克的三重态。我们还认为，超荷$1/3$的单重标量轻夸克模型是不可行的。利用现有的实验数据作为约束条件，证明了唯一轻子味违反衰变$\mathcal{B}(B_s\to μτ)$，$\mathcal{B}(B\to K μτ)$和$\mathcal{B}(B\to K^\ast μτ)$可以达到$\mathcal{O}(10^{-5})$那样大.
英文摘要：
We examine various scenarios that involve a light ${\cal O}(1 TeV)$ leptoquark state and select those which are compatible with the current experimental values for $\mathcal{B}(B_s\to μμ)$, $\mathcal{B}(B\to Kμμ)_{\mathrm{large}-q^2}$, $R_K=\mathcal{B^\prime}(B\to Kμμ)/\mathcal{B^\prime}(B\to Kee)$, and which lead to predictions consistent with other experimental data. We show that two such scenarios are phenomenologically plausible, namely the one with a doublet of scalar leptoquarks of hypercharge $1/6$, and the one with a triplet of vector leptoquarks of hypercharge $2/3$. We also argue that a model with a singlet scalar leptoquark of hypercharge $1/3$ is not viable. Using the present experimental data as constraints, it is shown that the exclusive lepton flavor violating decays, $\mathcal{B}(B_s\to μτ)$, $\mathcal{B}(B\to K μτ)$ and $\mathcal{B}(B\to K^\ast μτ)$, can be as large as $\mathcal{O}(10^{-5})$.
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