Covariant light-front approach for Bc decays into charmonium: implications on form factors and branching ratios.

In this work, we investigate the form factors of B c decays into J / Ψ , ψ (2 S , 3 S) , η c , η c (2 S , 3 S) , χ c 0 , χ c 1 , h c , and X(3872) mesons in the covariant light-front quark model (CLFQM). For the purpose of the branching ratio calculation, the form factors of B c → D (∗) , D s (∗) transitions are also included. In order to obtain the form factors for the physical transition processes, we need to extend these form factors from the space-like region to the time-like region. The q 2 dependence for each transition form factor is also plotted. Then, using the factorization method, we calculate the branching ratios of 80 B c decay channels with a charmonium involved in each mode. Most of our predictions are comparable to the results given by other approaches. As to the decays with the radially excited-state S-wave charmonia involved, such as ψ (2 S , 3 S) and η c (2 S , 3 S) , two sets of parameters for their light-front wave functions, corresponding to scenario I (SI) and scenario II (SII), are adopted to calculate the branching ratios. By comparing with the future experimental data, one can discriminate which parameters are more favored. [ABSTRACT FROM AUTHOR]