使用通用2 HDM超越$\mathcal{R}(D^{(*)})$- III for $b\to cτν$
Beyond $\mathcal{R}(D^{(*)})$ with the general 2HDM-III for $b\to cτν$
摘要：
我们审查的参数区域允许的测量$\mathcal{R}(D^{(*)})$和${\cal B}(B_{c}\toτν)$的理论限制通用标量和赝标量的新物理耦合，$g_s$和$g_p$。然后，我们使用这些区域作为约束条件来预测$b\to cτν$中的其他观测值的范围，包括差分衰减分布$dΓ/dq^{2}$ ;比率$\mathcal{R}(J/ψ)$和$\mathcal{R}(Λ_{c})$ ;以及$B\to D^{(\star)}τν$中的τ轻子极化，重点是CP违反正常极化。最后，我们将$g_s$和$g_p$中的允许区域映射到一般2 HDM-III模型的四个Yukawa耦合版本的参数中。我们发现，该模型仍然是可行的，但可以排除一个大的$\mathcal{R}(J/ψ)$的确认。
英文摘要：
We review the parameter regions allowed by measurements of $\mathcal{R}(D^{(*)})$ and by a theoretical limit on ${\cal B}(B_{c}\toτν)$ in terms of generic scalar and pseudoscalar new physics couplings, $g_s$ and $g_p$. We then use these regions as constraints to predict the ranges for additional observables in $b\to cτν$ including the differential decay distributions $dΓ/dq^{2}$; the ratios $\mathcal{R}(J/ψ)$ and $\mathcal{R}(Λ_{c})$; and the tau-lepton polarisation in $B\to D^{(\star)}τν$, with emphasis on the CP violating normal polarisation. Finally we map the allowed regions in $g_s$ and $g_p$ into the parameters of four versions of the Yukawa couplings of the general 2HDM-III model. We find that the model is still viable but could be ruled out by a confirmation of a large $\mathcal{R}(J/ψ)$.
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