Observation of charged κ in J/ψ→K⁎(892)∓KSπ±, K⁎(892)∓→KSπ∓ at BESII

M Ablikim,J Z Bai,Y Bai,Y Ban,X Cai,H S Chen,J C Chen,Y B Chen,Y P Chu,Y S Dai,Z Y Deng,S X Du,Jing Fang,C D Fu,Y N Gao,Y T Gu,Z J Guo,F A Harris,K L He,M He,Y K Heng,H M Hu, Tianjiao Hu,G S Huang,X T Huang,Muneyuki Ishida,Shin Ishida,Y P Huang,X B Ji,X S Jiang,J B Jiao,D P Jin,S Jin,Toshihiko Komada, S Kurokawa,Guanying Li,H B Li,Jinsong Li,Li Li,R Y Li,W G Li, Xiao Qing Li,Y F Liang,B J Liu,C X Liu, Fang Liu,H M Liu, J P Liu,Q Liu,R G Liu,Z A Liu,Fan Lu,G R Lu,J G Lu,C L Luo,F C Ma,H L Ma,Q M Ma, Tomoyuki Maeda,Z P Mao,Tadahito Matsuda,X H Mo,J Nie,Masatoshi Oda,S L Olsen,R G Ping,J F Qiu,G Rong,X D Ruan,L Y Shan,Li Shang,C P Shen,X Y Shen,H Y Sheng,H S Sun,S S Sun,Y Z Sun,Z J Sun,K Takamatsu,Xing Tang,J P Tian,Y Toi,Tsuneaki Tsuru,K Ukai,G Varner,Xia Wan,L S Wang,P L Wang,Y F Wang, Z Y Wang,C L Wei,D H Wei,Nan Wu,G F Xu,Xi Peng Xu,Yiting Xu,Koichi Yamada,I Yamauchi,M L Yan,H X Yang,M Yang,Y X Yang,M H Ye,Y X Ye,C X Yu,C Z Yuan,Yuan Yuan,Y Zeng,B X Zhang,C C Zhang,D H Zhang,H Y Zhang,J W Zhang,X Y Zhang,Y Y Zhang,Z P Zhang,J W Zhao,M G Zhao,P P Zhao,Z G Zhao,B Zheng,H Q Zheng, J P Zheng,Z P Zheng,B Zhong,Lei Zhou,K J Zhu,Q M Zhu,X W Zhu, Y S Zhu,Z A Zhu,B S Zou

Physics Letters B（2011）

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摘要

Using 58 million J/ψ decays obtained by BESII, a charged κ particle is observed in the analysis of the KSπ± system recoiling against K⁎(892)∓ selected in J/ψ→KSKSπ+π−. The mass and width values of the charged κ are obtained to be (826±49−34+49)MeV/c2 and (449±156−81+144)MeV/c2 for the Breit–Wigner parameters, and the pole position is determined to be (764±63−54+71)−i(306±149−85+143)MeV/c2. They are in good agreement with those of the neutral κ observed by the BES Collaboration.

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关键词

Charged κ,Low mass scalar,J/ψ decays,K⁎(892)Kπ

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