Measurements Of Branching Fractions Of D⁰???,?^?'??⁰,?'? And Integrated Luminosity Of D_s⁺ Data

By analyzing 2.93 fb-1 of data taken at s^1/2 = 3.773 GeV with the BES? detector, we search for Do??? and determine its branching fraction to be Also, we measure the branching fractions for D0???,D0??'?0,D0??0? and D0??'?, which are and respectively, where the first and second uncertainties are statistical and systematic.The B?Do0???? is measured for the first time, the ??D0???? is consistent with the PDG value but with better precision, and the other 3 decay branching fractions are consistent with the PDG values. These results will provide an important insight into the SU?3? symmetry and its breaking effects in the decays of charmed mesons.By analyzing the large angle Bhabha scattering events from the data set collect-ed at s^1/2=4.18 GeV taken in 2016 with the BES? detector at the BEPCII, we determine the integrated luminosity of the data set to be ?3189.0 ±0.2±31.9? pb-1.This result will provide an important normalization constant for the cross section measurements in the XYZ study and accurate background estimation in D_s⁺ physical studies.