The $B_c$ Decays to $P$-wave Charmonium by Improved Bethe-Salpeter Approach

Zhi-hui Wang, Guo-Li Wang, Chao-Hsi Chang

We re-calculate the exclusive semileptonic and nonleptonic decays of $B_c$ meson to a $P$-wave charmonium in terms of the improved Bethe-Salpeter (B-S) approach, which is developed…