Semileptonic decays of the Bc meson -: art. no. 074010

We study the semileptonic transitions B-c-->eta (c), J/psi D, D*, B, B*, B-s, B-s* in the framework of a relativistic constituent quark model. We use experimental data on leptonic J/psi decay, lattice and QCD sum rule results on leptonic B-c decay, and experimental data on radiative eta (c) transitions to adjust the quark model parameters. We compute all form factors of the above semileptonic B-c transitions and give predictions for various semileptonic B-c decay modes including their tau modes when they are kinematically accessible. The implications of heavy quark symmetry for the semileptonic decays are discussed and are shown to be manifest in our explicit relativistic quark model calculation. A comparison of our results with the results of other calculations is performed.