论文标题
$ r（j/ψ）$和$ b_c^ - \ rightarrow j/ψ\ ell^ - \barν_\ ell $ Lepton Floation Commenceation rattice qcd违反可观察到的物品
$R(J/ψ)$ and $B_c^- \rightarrow J/ψ\ell^-\barν_\ell$ Lepton Flavor Universality Violating Observables from Lattice QCD
论文作者
论文摘要
我们使用$ b_c \ rightArrow j/ψ$形式的晶格QCD计算来确定半衰减频道的差衰变率，并构建分支分数$ r（j/ψ）= \ nathcal {b_c^ - \ rightarroww - \ rightarroww- j/ψτ^ - \barν_τ）/\ Mathcal {b}（b_c^ - \ rightarrow j/ψμ^ - \barν_μ）$。我们发现$ r（j/ψ）= 0.2582（38）$，并给出错误预算。我们还扩展了相关的可观察到的可观察物，最近建议研究Lepton风味普遍性违反$ B \ rightarrow d^*\ellν$的效果，以$ b_c \ rightArrow J/ψ\ ell维$，并在不同的新物理风景下为其价值做出预测。
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.
