Amplitude analysis and branching-fraction measurement of Ds+→KS0π+π0.

By using 6.32 fb⁻¹ of data collected with the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, we perform an amplitude analysis of the decay D s + → K S 0 π + π 0 and determine the relative fractions and phase differences of different intermediate processes, which include K S 0 ρ (770)⁺, K S 0 ρ (1450)⁺, K^*(892)⁰π⁺, K^*(892)⁺π⁰, and K^*(1410)⁰π⁺. With the detection efficiency based on the amplitude analysis results, the absolute branching fraction is measured to be ℬ D s + → K S 0 π + π 0 = 5.43 ± 0.30 stat ± 0.15 syst × 10 − 3 . [ABSTRACT FROM AUTHOR]