标题： $B \to D^{(*)} τν_τ$的衰变特性与RIQ模型 显示英文标题

标题： $B \to D^{(*)} τν_τ$ decay properties with RIQ model

摘要： 在本工作中，我们在相对论独立夸克模型中计算了$B \to D^{(*)} \,\tau \, \nu_{\tau}$和$B_s \to D_s^{(*)}\, \tau\, \nu_{\tau}$的分支比，强调了这些衰变通道在精确味物理时代的谐振势模型依赖性分析。考虑到 LHCb 和 Belle 对纵向$\tau$极化和纵向极化分数的实验观测，我们也在我们的模型框架内研究了这些可观测量，这些结果与标准模型预期一致。我们对$q^2$全部可访问的运动学范围内的形式因子进行了全面分析。我们的结果与其他理论方法以及实验测量结果一致且兼容。此外，我们在半缪子模式下评估了$B_s$与$B_0$的干净比值，这些比值与 LHCb 的测量结果一致，并支持 SU(3) 额外对称性的有效性。尽管新物理的概念在当前的TeV尺度上面临重大挑战，但半轻子$B$衰变仍然始终作为研究衰变动力学的有价值探针。 显示英文摘要

摘要： In this work we compute the branching fraction of $B \to D^{(*)} \,\tau \, \nu_{\tau}$ and $B_s \to D_s^{(*)}\, \tau\, \nu_{\tau}$ within the Relativistic Independent Quark Model, emphasizing the harmonic potential model dependent analysis of these decay channels in the precision flavor physics era. Considering the experimental observation of longitudinal $\tau$-polarization and fraction of longitudinal polarization at LHCb and Belle, we have also investigated these observables within our model framework which are aligning well with the standard model expectations. We perform a comprehensive analysis of the form factors across the whole accessible kinematic range of $q^2$. Our results are consistent and compatible with other theoretical approaches as well as with the experimental measurements. Furthermore, we evaluated the clean ratios of $B_s$ to $B_0$ in the semimuonic mode that are in accordance with the LHCb measurements, and support the validity of the SU(3) flavor symmetry. Although the concept of new physics is facing a significant challenge at the current TeV scale, semileptonic $B$ decays, nevertheless, always serve as a valuable probe to study the decay dynamics.