New physics in the angular distribution of $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decay

Quan-Yi Hu, Xin-Qiang Li, Xiao-Long Mu +2

In $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}{\bar{\nu }}_{\tau }$ decay, the three-momentum ${\mathbf{p}}_{{\tau }^{-}}$ cannot be determined accurately due to the decay products of ${\tau }^{-}$ inevitably include an…