In the framework of factorization, we study direct CP violation in the decays of B（s） → J/φP（V） （P（V） refer to the pseudoscalar （vector） meson）. The CP violation depends strongly on Cabibbo-Kobayashi- Maskawa （CKM） matrix elements and the effective parameter, Nc. The recent experimental data for the branching ratios of B（s） → J/φP（V） are accurate enough and we can give a strong constraint on the range of Arc. We find that the CP violating asymmetry is consistent with the available experiment values for the b→ d transition, and a little smaller than the b→ s transition. We also predict the CP violation of other decay channels for B（s） → J/φP（V）. We expect our results can give valuable guidance for experiments.
The spin is an important property of a particle. Although it is unlikely, there is still a possibility that two particles with different spins share similar masses. In this paper, we propose a method to probe this kind of mass degeneracy of particles with different spins. We use the cascade decay B^＋ →X（3872）K^＋, X（3872）→D^＋D^- to illustrate our method. It can be seen that the possible mass degeneracy of X（3872） can lead to interesting behavior in the corresponding cascade decay.
