Analysis Of D_s?PP In BES?

Experimental studies of hadronic decays of Ds mesons play a prominent role in particle physics.Although pQCD and QCD factorization have been applied to B decays successfully,it doesn't make much sense to apply them to the charm sec-tor.So,there is still no reliable theory for hadronic D decays.All two-body hadronic decays of heavy mesons can be expressed in terms of six distinct topological diagram-s and Charmed mesons decaying to two pseudoscalar mesons(Ds? PP)is simple than other decay mode relatively and can provide the theoretical calculation with good verification.Measurement of Ds meson decays opens an ideal window to test fla-vor topology and SU(3)predictions and to specify strong phases of decay amplitudes through triangle relations.In this study,we consider only KSO,not KLO,and report all branching fractions for Cabibbo-favored,singly-Cabibbo-suppressed,and doubly-Cabibbo-suppressed Ds?PP decays except modes involving KLO.Base on the e+ e-collision data collect at(?)= 4.180 GeV corresponding to an integrated luminosity of 3.19 fb-1,at BES?,we study the decays Ds ? PP.We use single-tag method to suppress background and obtain the branching fraction which have good agreement with the PDG result.we can further improve the measurement accuracy if we adopt a better system error estimation method.