In this paper, we calculate the branching ratios and CP-violating asymmetries for $B_{ s}\to \rho^\pm K^\mp$, $B_{ s}\to\rho^{ 0}\bar{ K}^0 $ and $B_{ s}\to\omega\bar{ K}^0$ decays in the perturbative QCD (pQCD) factorization approach. The theoretical predictions for the CP averaged branching ratios of the considered decays are: $Br(B_{ s}\to\rho^\pm K^\mp)\approx 24.7 \times 10^{ -6}$, $Br(B_{ s}\to\rho^{ 0}\bar{ K}^0) \approx 1.2 \times 10^{ -7}$ and $Br(B_{ s} \to\omega\bar{ K}^0) \approx 1.7 \times 10^{ -7}$; and we also predict very large direct CP-violating asymmetries for the latter two decay modes: $A_{ CP}^{ dir}(\rho^{ \pm} K^{ \mp})\approx -12 %$, $A_{ CP}^{ dir}(\rho^0\bar{ K}^0)\approx -92%$, $A_{ CP}^{ dir}(\omega^0\bar{ K}^0)\approx 81%$, $A_{ CP}^{ mix}(\rho^0\bar{ K}^0)\approx -36%$, and $A_{ CP}^{ mix}(\omega^0\bar{ K}^0) \approx -40%$, which can be tested in the forthcoming LHC-b experiments.
Categories: hep-ph hep-ex