Branching Fraction Measurement Of ?_c~+?p?~+?~- And PK~+K~-,Partial Wave Analysis Of D~0?K_S~0?~+?~-?~0 At Bes?

Charmed baryon and meson provide an excellent laboratory for studying the impact of nonperturbative-QCD dynamics and for testing the validity of theoretical methods for dealing with them.Therefore,it is crucial to take the precision measurement of charm hadron decay experimentally.BESIII experiment has the unique data sample on the threshold production of hadron,which could provide very important environment to investigate the decay of charmed hadron.In this paper,we use the e+e~collision data collected by BESIII detector to perform the following three projects.Using 567 pb-1 data of center-of-mass energy of(?)= 4.6 GeV,near the Lambdac+?c-threshold,we study the singly Cabibbo-suppressed decays ?c+? p?+?-and ?c+?pK+K-.By normalizing with respect to the Cabibbo-favored decay ?c+? pK-?+,we obtain ratios of branching fractions:(?)=(6.70 ± 0.48 ± 0.25)%,(?)=(1.81 ± 0.33 ± 0.13)%,and(?)=(9.36 ± 2.22 ± 0.71)× 10-3,where the uncertainties are statistical and systematic,respectively.The absolute branching fractions are also presented.Among these measurements,the decay ?c+? p?+?-is observed for the first time,and the precision of the branching fraction for ?c+?p? and?c+? pK+Knon-?-is significantly improved.The results provide important informa-tion to understand the dynamics of ?c+ decay,and distinguish predictions from different phenomenological model.Using a data sample of e+e-collision data corresponding to an integrated lumi-nosity of 2.93 fb-1 collected with the BESIII detector at a center-of-mass energy of(?)= 3.773 GeV,we search for the singly Cabibbo-suppressed decays DO? ?O?O?O,?O?O?,?O?? and ??? using the double tag method.The absolute branching fractions are measured to be B(DO? ?O?O?O)=(2.0 ± 0.4 ± 0.3)× 10-4,B(DO??O?O?)=(3.8± 1.1 ±0.7)× 10-4 and B(DO??O??)=(7.3± 1.6± 1.5)× 10-4 with the statistical significances of 4.8?,3.8? and 5.5?,respectively,where the first uncertainties are sta-tistical and the second ones systematic.No significant signal of DO???? is found,and the upper limit on its decay branching fraction is set to be B(DO ? ???)<1.3 × 10-4 at the 90%confidence level.These results could provide experimental information the-oretical predicts.We also use the data of(?)= 3.773 GeV to perform the partial wave analysis of DO? KSO?+?-?O,which could determine the dominant intermediate processes and their fitting fractions.According to the fitting results,the main processes are D ? VV such as DO? K*(892)-?+and D?AP,such as DO? K1(1270)-?+.The results will provide a precise decay model and amplitude parameters for absolute branching fraction,strong phase measurement or ? angle determination.