The decays of $B_c$ meson to P-wave charmonium ${\chi }_c(h_c)$ and to leptons with gluon bremsstrahlung

Theoretical computations on the decays of $B_c$ meson to $P$-wave charmonium ${\chi }_c$ or $h_c$ with some particle(s) else and on the decays of $B_c$ meson to leptons with gluon bremsstrahlung, and the results as well are outlined.