Observation of D^{+}→K_{S}^{0}a_{0}(980)^{+} in the Amplitude Analysis of D^{+}→K_{S}^{0}π^{+}η.
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Zhang,Z D Zhang,Z H Zhang,Z L Zhang,Z Y Zhang,Z Y Zhang,G Zhao,J Y Zhao,J Z Zhao,Lei Zhao,Ling Zhao,M G Zhao,R P Zhao,S J Zhao,Y B Zhao,Y X Zhao,Z G Zhao,A Zhemchugov,B Zheng,J P Zheng,W J Zheng,Y H Zheng,B Zhong,X Zhong,H Zhou,L P Zhou,X Zhou,X K Zhou,X R Zhou,X Y Zhou,Y Z Zhou,J Zhu,K Zhu,K J Zhu,L Zhu,L X Zhu,S H Zhu,S Q Zhu,T J Zhu,W J Zhu,Y C Zhu,Z A Zhu,J H Zou,J Zu,BESIII Collaboration
Physical review letters（2024）
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摘要
We perform for the first time an amplitude analysis of the decay D^{+}→K_{S}^{0}π^{+}η and report the observation of the decay D^{+}→K_{S}^{0}a_{0}(980)^{+} using 2.93 fb^{-1} of e^{+}e^{-} collision data taken at a center-of-mass energy of 3.773 GeV with the BESIII detector. As the only W-annihilation-free decay among D to a_{0}(980) pseudoscalar, D^{+}→K_{S}^{0}a_{0}(980)^{+} is the ideal decay in extracting the contributions of the W-emission amplitudes involving a_{0}(980) and to study the final-state interactions. The absolute branching fraction of D^{+}→K_{S}^{0}π^{+}η is measured to be (1.27±0.04_{stat}±0.03_{syst})%. The branching fractions of intermediate processes D^{+}→K_{S}^{0}a_{0}(980)^{+} with a_{0}(980)^{+}→π^{+}η and D^{+}→π^{+}K[over ¯]_{0}^{*}(1430)^{0} with K[over ¯]_{0}^{*}(1430)^{0}→K_{S}^{0}η are measured to be (1.33±0.05_{stat}±0.04_{syst})% and (0.14±0.03_{stat}±0.01_{syst})%, respectively.
