Semileptonic and nonleptonic decays of B_c mesons to orbitally excited heavy mesons in the relativistic quark model

摘要

The form factors of weak decays of the B_c meson to orbitally excitedcharmonium, D, B_s and B mesons are calculated in the framework of theQCD-motivated relativistic quark model based on the quasipotential approach.Relativistic effects are systematically taken into account. The form factordependence on the momentum transfer is reliably determined in the wholekinematical range. The form factors are expressed trough the overlap integralsof the meson wave functions which are known from the previous mass spectracalculations within the same model. On this basis semileptonic and nonleptonicB_c decay rates to orbitally excited heavy mesons are calculated. Predictionsfor the B_c decays to the orbitally and radially excited 2P and 3S charmoniumstates are given which could be used for clarifying the nature of the recentlyobserved charmonium-like states above the open charm production threshold.