Abstract
On the basis of three-point sum rules, the form factors for the semileptonic decays B c + → B s(B s * )l + ν l are calculated with allowance for α s/v Coulomb corrections for the heavy quarkonium. Generalized relations associated with spin symmetry within the approach combining heavy-quark effective theory and nonrelativistic QCD are derived for form factors in the region of recoil momenta close to zero. The nonleptonic decays of the B c meson are studied on the basis of the factorization hypothesis. By summing the main exclusive modes of c-quark decays and by using the results of a previous analysis of b-quark decays, the B c-meson lifetime is estimated within QCD sumrules and within nonrelativistic QCD.
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