格点量子色动力学中轻子味普适性破坏的$R(J/ψ)$和$B_c^- \rightarrow J/ψ\ell^-\barν_\ell$
$R(J/ψ)$ and $B_c^- \rightarrow J/ψ\ell^-\barν_\ell$ Lepton Flavor Universality Violating Observables from Lattice QCD
摘要：
我们使用我们的格点量子色动力学计算的$B_c\rightarrow J/ψ$形状因子，以确定微分衰变率的声子衰变通道，并构建分支分数$R(J/ψ) = \mathcal{B}(B_c^- \rightarrow J/ψτ^-\barν_τ)/\mathcal{B}(B_c^- \rightarrow J/ψμ^-\barν_μ)$的比例。我们找到了$R(J/ψ) = 0.2582(38)$并给出了误差预算。我们还将最近提出的用于研究$B\rightarrow D^*\ellν$中轻子味普适性违反效应的相关角观测量推广到$B_c \rightarrow J/ψ\ellν$，并对它们在不同新物理情景下的值进行了预测。
英文摘要：
We use our lattice QCD computation of the $B_c\rightarrow J/ψ$ form factors to determine the differential decay rate for the semitauonic decay channel and construct the ratio of branching fractions $R(J/ψ) = \mathcal{B}(B_c^- \rightarrow J/ψτ^-\barν_τ)/\mathcal{B}(B_c^- \rightarrow J/ψμ^-\barν_μ)$. We find $R(J/ψ) = 0.2582(38)$ and give an error budget. We also extend the relevant angular observables, which were recently suggested for the study of lepton flavor universality violating effects in $B\rightarrow D^*\ellν$, to $B_c \rightarrow J/ψ\ellν$ and make predictions for their values under different new physics scenarios.
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