Using heavy quark spin symmetry in semileptonic Bc decays -: art. no. 034012

The form factors parametrizing the B-c semileptonic matrix elements can be related to a few invariant functions if the decoupling of the spin of the heavy quarks in B-c and in the mesons produced in the semileptonic decays is exploited. We compute the form factors as an overlap integral of the meson wave functions obtained using a QCD relativistic potential model, and give predictions for semileptonic and nonleptonic B-c decay modes. We also discuss possible experimental tests of the heavy quark spin symmetry in B-c decays.