$B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau },{\rho }^{-}{\nu }_{\tau },{\ell }^{-}{\bar{\nu }}_{\ell }{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decays with visible final-state kinematics

Xin-Qiang Li, Xin Xu, Ya-Dong Yang +1

The semitauonic $B_c^{-}\to J/\psi {\tau }^{-}{\bar{\nu }}_{\tau }$ decay is optimal to scrutinize possible new physics effects in $b\to c{\tau }^{-}{\bar{\nu }}_{\tau }$ transitions as indicated by the current data on $R(D^…