Amplitude analysis and branching fraction measurement of $D_s^+ \to K^-K^+π^+π^0$

Abstract

We present the first amplitude analysis of the decay D + s → K − K + π + π 0 using data samples of 6.32 fb −1 recorded with the BESIII detector between 4.178 and 4.226 GeV. More than 3000 events selected with a purity of 97.5% are used to perform the amplitude analysis, and nine components are found necessary to describe the data. Relative fractions and phases of the intermediate decays are determined. With the detection efficiency determined by the results of the amplitude analysis, we measure the branching fraction of D + s → K − K + π + π 0 decay to be (5.42 ± 0.10stat. ± 0.17syst.)%.

Study of the $D_s^+\to a_0(980) ρ$ and $a_0(980) ω$ decays

“…With the π +(0) exchange, η (′) and π + are turned into a +(0) 0 and π 0(+) , respectively. Since BESIII has recently reported the first observation of the branching fractions of D + s → SV, S → P P as [13,14]…”