非对称左右模型中的B衰变
B Decays in an Asymmetric Left-Right Model
摘要：
最近观察到的$B$衰变的SM预测的分歧的动机，我们研究$B$跃迁的非对称类的$SU(2)_L \times SU(2)_R \times U(1)_{B-L}$模型，与一个简单的单参数结构的右手混合矩阵的夸克，它服从的约束从K介子物理。我们使用实验上的$b \to s γ$，$b \to c e {\bar ν}_e$，和$B_{d,s}^0 -\bar{B}^0_{d,s}$混合的分支比的约束来限制模型的参数：$\displaystyle {g_R}/{g_L}, M_{W_2}, M_{H^\pm}, \tan β$以及右手夸克混合矩阵$V^R_{CKM}$的元素。我们提出了一个比较更常用的（显式）左右对称模型。我们的分析揭示了对$b$跃迁最敏感的参数，并揭示了一个大的参数空间，其中左手和右手夸克的混合不同，打开了观察标准模型和左右模型之间的行为显着差异的可能性。
英文摘要：
Motivated by recently observed disagreements with the SM predictions in $B$ decays, we study $b \to d, s$ transitions in an asymmetric class of $SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ models, with a simple one-parameter structure of the right handed mixing matrix for the quarks, which obeys the constraints from kaon physics. We use experimental constraints on the branching ratios of $b \to s γ$, $b \to c e {\bar ν}_e$, and $B_{d,s}^0 -\bar{B}^0_{d,s}$ mixing to restrict the parameters of the model: $\displaystyle {g_R}/{g_L}, M_{W_2}, M_{H^\pm}, \tan β$ as well as the elements of the right-handed quark mixing matrix $V^R_{CKM}$. We present a comparison with the more commonly used (manifest) left-right symmetric model. Our analysis exposes the parameters most sensitive to $b$ transitions and reveals a large parameter space where left- and right-handed quarks mix differently, opening the possibility of observing marked differences in behaviour between the standard model and the left-right model.
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