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Davies, Judd Harrison","submitted_at":"2020-07-14T10:31:47Z","abstract_excerpt":"We use our lattice QCD computation of the $B_c\\rightarrow J/\\psi$ form factors to determine the differential decay rate for the semitauonic decay channel and construct the ratio of branching fractions $R(J/\\psi) = \\mathcal{B}(B_c^- \\rightarrow J/\\psi \\tau^-\\bar{\\nu}_\\tau)/\\mathcal{B}(B_c^- \\rightarrow J/\\psi \\mu^-\\bar{\\nu}_\\mu)$. We find $R(J/\\psi) = 0.2582(38)$ and give an error budget. 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