Comment on Implications of new physics in the decays $B_c\to (J/\psi ,{\eta }_c)\tau \nu$

Christine Davies, Craig McNeile

As part of a study BSM corrections to leptonic decays of the $B_c$ meson, Tran et al. (arXiv:1801.06927) use the covariant confining quark model (CCQM) to estimate the matrix eleme…