B _c decays to heavy-light orbitally excited mesons

We calculate the exclusive semileptonic and nonleptonic decays of B _c meson to heavy-light orbitally excited states in the framework of the improved BetheSalpeter method. The hadronic matrix elements are calculated and expressed as overlap integrals of the relativistic Salpeter wave functions of corresponding mesons, decay rates of the semileptonic and nonleptonic B _c decays to D ^* _J, B ^* _J and B ^* _sJ are obtained. Some channels provide us sizable ratios, for examples, Br(B _c ⁺→ B _s0enu) = (0.11±0.04) and Br(B _c ⁺B _s0π ⁺) = (1.1±0.3), with such ratios, the missing scalar B _s0 may be detected though its cascade strong decays in the forthcoming LHC experiment.