Phenomenological Analysis of Charmless Decays $B_{s}{\to}PP,PV$ with QCD Factorization

We calculated the CP averaged branching ratios and CP-violating asymmetries of two-body charmless hadronic $B_{s}$ ${\to}$ $PP$, $PV$ decays with the QCDF approach, including the contributions from the chirally enhanced power corrections and weak annihilations. Only several decay modes, such as $B_{s}$ ${\to}$ $K^{({\ast})}K$, $K^{({\ast}){\pm}}{\pi}^{\mp}$, $K^{\pm}{\rho}^{\mp}$, ${\eta}^{(\prime)}{\eta}^{(\prime)}$, have large branching ratios, which may be observed in the near future. The penguin-to-tree ratio ${|}P_{{\pi}{\pi}}/T_{{\pi}{\pi}}{|}$ and a bound on angle ${\gamma}$ are given.