We investigate the longitudinal lepton polarization asymmetry in the exclusive processes B→Kl ϩ l Ϫ and B→K*l ϩ l Ϫ . We include both short-and long-distance contributions to the asymmetry in our discussions. We find that average values of the polarization asymmetries of the muon and for B→K ( * ) ϩ Ϫ and B→K ( * ) ϩ Ϫ are Ϫ0.8 ͑Ϫ0.7͒ and Ϫ0.2 ͑Ϫ0.5͒, respectively.
We analyze the decay processes of B c → B n M with the SU (3) F flavor symmetry and spindependent amplitudes, where B c (B n ) and M are the anti-triplet charmed (octet) baryon and nonet meson states, respectively. In the SU (3) F approach, it is the first time that the decay rates and up-down asymmetries are fully and systematically studied without neglecting the O (15)
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