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$B_s \to \rho(\omega) K^{\ast}$ are useful to determine the $B_s$distribution amplitude, as well as constrain the CKM phase angle $\alpha$. Westudy these decays within the Perturbative QCD (PQCD) picture. In thisapproach, we calculate factorizable, non-factorizable, as well as annihilationdiagrams. We find the branching ratio for $B_s \to \rho^+ K^{*-}$ is big toorder $10^{-5}$, we also find there's large direct CP violation in $B_s(\barB_s) \to \rho^0(\omega) \bar K^{*0}(K^{*0})$. Our predictions are consistentwith those from other methods and current experiments.Comment: 16 pages, 5 figure

Bs → ρ(ω)K* with the perturbative QCD approach

B_s → ρ(ω)K* with the perturbative QCD approach