Observation of an a_{0}-like State with Mass of 1.817 GeV in the Study of D_{s}^{+}→K_{S}^{0}K^{+}π^{0} Decays. 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Zeng , Y H Zhan , A Q Zhang , B L Zhang , B X Zhang , G Y Zhang , H Zhang , H H Zhang , H Y Zhang , J L Zhang , J Q Zhang , J W Zhang , J X Zhang , J Y Zhang , J Z Zhang , Jianyu Zhang , Jiawei Zhang , L M Zhang , L Q Zhang , Lei Zhang , P Zhang , Q Y Zhang , Shulei Zhang , X D Zhang , X M Zhang , X Y Zhang , Y Zhang , Y T Zhang , Y H Zhang , Yan Zhang , Yao Zhang , Z H Zhang , Z Y Zhang , G Zhao , J Zhao , J Y Zhao , J Z Zhao , Lei Zhao , Ling Zhao , M G Zhao , Q Zhao , S J Zhao , Y B Zhao , Y X Zhao , Z G Zhao , A Zhemchugov , B Zheng , J P Zheng , Y H Zheng , B Zhong , C 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 X Zhu , S H Zhu , S Q Zhu , T J Zhu , W J Zhu , Y C Zhu , Z A Zhu , B S Zou , J H Zou Physical review letters（2022）
摘要
Using e^{+}e^{-} annihilation data corresponding to an integrated luminosity of 6.32 fb^{-1} collected at center-of-mass energies between 4.178 and 4.226 GeV with the BESIII detector, we perform the first amplitude analysis of the decay D_{s}^{+}→K_{S}^{0}K^{+}π^{0} and determine the relative branching fractions and phases for intermediate processes. We observe an a_{0}-like state with mass of 1.817 GeV in its decay to K_{S}^{0}K^{+} for the first time. In addition, we measure the ratio {B[D_{s}^{+}→K[over ¯]^{*}(892)^{0}K^{+}]/B[D_{s}^{+}→K[over ¯]^{0}K^{*}(892)^{+}]} to be 2.35_{-0.23stat}^{+0.42}±0.10_{syst}. Finally, we provide a precision measurement of the absolute branching fraction B(D_{s}^{+}→K_{S}^{0}K^{+}π^{0})=(1.46±0.06_{stat}±0.05_{syst})%.
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