Study of B-c - J/psi V and B*(c) - eta V-c decays within the QCD factorization

摘要

In this paper, we study the non-leptonic B-c - J/psi V and B*(c) - eta V-c (V = rho, K*) weak decays in the framework of QCD factorization. In the evaluation, the form factors are calculated using the Bauer-Stech-Wirbel model and the light-front quark model, respectively. Besides the longitudinal amplitude, the power-suppressed transverse contributions are also evaluated at next-to-leading order. The predictions for the observables of B-c - J/psi V and B*(c) - eta V-c decays are presented. We find that the NLO QCD contribution presents about 8% correction to the branching ratios, and the longitudinal polarization fractions of these decays are at the level of ( 80 similar to 90)%. In addition, we suggest direct measurements on some useful ratios, R-K*/rho((lambda=0)) and (R) over tilde ((lambda=0))(K*/rho), which are very suitable to test the consistence between theoretical prediction and data because their theoretical uncertainties can be well controlled.