B_s�'πK Decays And The Correction Of The Perturbative QCD

As a good place for testing the standard model and searching for cp Violation and possiblenew physics beyond the SM, B meson decays are getting more and more interesting and attracting more and more attentions。In the one hand, the forthcoming LHC-b experimentswill produce a large number of heavier B_s,B_c meson pairs, together with 10¹² B_u,d events。in the other hand,theorists provide many methods in dealing with this program,such as naive factorization, generalized factorization,QCD factorization and perturbativeQCD(PQCD).A11 this need precise calculation.In this paper,we calculate and analyze B_s→πK decay channels of B in the PQCD factorization approach based on K_T factoriza-tion,which consider next leading order contributions including vertex corrections, quark-loop corrections and magnetic penguin corrections.Our main results are as following:·The branching ratios of decay B_s→πK are larger than experimental result, and the pQCD predictions are consistent with QCDF predictions;·Our predictions of CP violation in B_s→πK decay agree with QCDF ones within errors except the large deviation in direct CP violation in B_s→π⁰K⁰;·There exists large uncertainties mainly from form parameter of B meson and the weak angels;·The branching ratios are small and sensitive to new physics, therefore can be used to test standard model exactly and signal new physics.