Bc Decays and Lifetime in QCD Sum Rules
V. V. Kiselev, A. E. Kovalsky, A. K. Likhoded
Abstract
In the framework of three-point QCD sum rules, the form factors for the semileptonic decays of Bc --> Bs(Bs*) l νare calculated with account for the Coulomb-like alphas/v-corrections in the heavy quarkonium. The generalized relations due to the spin symmetry of HQET/NRQCD for the form factors are derived at the recoil momentum close to zero. The nonleptonic decays are studied using the assumption on the factorization. The Bc meson lifetime is estimated by summing up the dominating exclusive modes in the c --> s transition combining the current calculations with the previous analysis of b --> c decays in the sum rules of QCD and NRQCD.
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