A study of charged κ in J/ψ→K±KSπ∓π0

• DOI: 10.1016/j.physletb.2010.08.015
• Publication Date: 2010-08-15T08:42:25Z
• Authors: M. Ablikim; J.Z. Bai; Y. Bai; Y. Ban; X. Cai; H.F. Chen; H.S. Chen; H.X. Chen; J.C. Chen; Jin Chen; X.D. Chen; Y.B. Chen; Y.P. Chu; Y.S. Dai; Z.Y. Deng; S.X. Du; J. Fang; C.D. Fu; C.S. Gao; Y.N. Gao; S.D. Gu; Y.T. Gu; Y.N. Guo; Z.J. Guo; F.A. Harris; K.L. He; M. He; Y.K. Heng; H.M. Hu; T. Hu; G.S. Huang; X.T. Huang; Y.P. Huang; X.B. Ji; X.S. Jiang; J.B. Jiao; D.P. Jin; S. Jin; G. Li; H.B. Li; J. Li; L. Li; R.Y. Li; W.D. Li; W.G. Li; X.L. Li; X.N. Li; X.Q. Li; Y.F. Liang; B.J. Liu; C.X. Liu; Fang Liu; Feng Liu; H.M. Liu; J.P. Liu; H.B. Liu; J. Liu; Q. Liu; R.G. Liu; S. Liu; Z.A. Liu; F. Lu; G.R. Lu; J.G. Lu; C.L. Luo; F.C. Ma; H.L. Ma; Q.M. Ma; M.Q.A. Malik; Z.P. Mao; X.H. Mo; J. Nie; S.L. Olsen; R.G. Ping; N.D. Qi; J.F. Qiu; G. Rong; X.D. Ruan; L.Y. Shan; L. Shang; C.P. Shen; X.Y. Shen; H.Y. Sheng; H.S. Sun; S.S. Sun; Y.Z. Sun; Z.J. Sun; X. Tang; J.P. Tian; G.L. Tong; G.S. Varner; X. Wan; L. Wang; L.L. Wang; L.S. Wang; P. Wang; P.L. Wang; Y.F. Wang; Z. Wang; Z.Y. Wang; C.L. Wei; D.H. Wei; N. Wu; X.M. Xia; G.F. Xu; X.P. Xu; Y. Xu; M.L. Yan; H.X. Yang; M. Yang; Y.X. Yang; M.H. Ye; Y.X. Ye; C.X. Yu; C.Z. Yuan; Y. Yuan; Y. Zeng; B.X. Zhang; B.Y. Zhang; C.C. Zhang; D.H. Zhang; F. Zhang; H.Q. Zhang; H.Y. Zhang; J.W. Zhang; J.Y. Zhang; X.Y. Zhang; Y.Y. Zhang; Z.X. Zhang; Z.P. Zhang; D.X. Zhao; 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; L. Zhou; K.J. Zhu; Q.M. Zhu; X.W. Zhu; Y.S. Zhu; Z.A. Zhu; Z.L. Zhu; B.A. Zhuang; B.S. Zou
• Keywords: Invariant mass

Based on 58 x 10(6) J/psi events collected by BESII, the decay J/psi -> (KKS)-K-+/-pi(-/+)pi(0) is studied. In the invariant mass spectrum recoiling against the charged K*(892)(+/-), the charged kappa particle is found as a low mass enhancement. If a Breit-Wigner function of constant width is used to parameterize the kappa, its pole locates at (849 +/- 77(-14)(+18)) - i(256 +/- 40(-22)(+46)) MeV/c(2). Also in this channel, the decay J/psi -> K*(892)K+*(892)- is observed for the first time. Its branching ratio is (1.00 +/- 0.19(-0.32)(+0.11)) x 10(-3). (C) 2010 Elsevier B.V. All rights reserved.