论文标题
vector $ su（4）$ leptoquarks的简化模型
Simplified models of vector $SU(4)$ leptoquarks at the TeV
论文作者
论文摘要
假设确认半副本$ b $ - 订单中的异常，它们在交换大量矢量leptoquark领域的解释中，$u_μ^a $ 2/3的费用，似乎需要包含$u_μ^$ a $ a $ a $ a $ a $ a $引入类似矢量的费米子，$ f_j $，在$ su（4）$的基本中。我们考虑以$ su（4）$对称性（全局或局部）的性质，类似向量的费米子的数量以及希格斯玻色子的耦合到sm fermions（直接或通过与矢量般的fermions混合而引起的）。在所有情况下，我们都会最小化$ u（2）^n_f $风味对称性，但有一个动机的例外。然后，我们执行一个全局拟合，包括对$ \ Mathcal {g}_μ^a $在树级别的交换敏感的主要可观察物，并以对紫外线完成不敏感的logs主导。
Assuming confirmation of the anomalies in semi-leptonic $B$-decays, their explanation in terms of the exchange of a massive vector leptoquark field, $U_μ^a$, of charge 2/3, appears to require the inclusion of $U_μ^a$ in the vector multiplet of the adjoint of Pati-Salam $SU(4)$, $\mathcal{G}_μ^A$, as well as the introduction of vector-like fermions, $F_j$, in the fundamental of $SU(4)$. We consider simplified models characterised by the nature of the $SU(4)$ symmetry (global or local), by the number of vector-like fermions, and by the couplings of the Higgs boson to SM fermions (direct or induced by mixing with the vector-like fermions). In all cases, we implement a minimal breaking of a $U(2)^n_f$ flavour symmetry, with a single motivated exception. We then perform a global fit including the main observables sensitive to exchanges of the $\mathcal{G}_μ^A$ at tree level and in loops dominated by logs insensitive to the UV completion.
