A study of charged κ in J/ψ→K±KSπ∓π0

• Published in: Physics letters. B 2010-09, Vol.693 (2), p.88-94
• Main Authors: Bai, J.Z., Bai, Y., Chen, H.X., Chen, J.C., Chen, Y.B., Chu, Y.P., Deng, Z.Y., Fang, J., Gao, C.S., Gu, S.D., Gu, Y.T., Guo, Y.N., Harris, F.A., Hu, H.M., Hu, T., Huang, Y.P., Jiang, X.S., Jiao, J.B., Jin, D.P., Jin, S., Li, H.B., Li, R.Y., Li, W.D., Li, W.G., Li, X.L., Li, X.N., Liang, Y.F., Liu, B.J., Liu, C.X., Liu, Fang, Liu, Feng, Liu, H.M., Liu, J.P., Liu, H.B., Liu, Q., Liu, R.G., Liu, Z.A., Lu, F., Lu, G.R., Lu, J.G., Luo, C.L., Ma, H.L., Ma, Q.M., Malik, M.Q.A., Mao, Z.P., Nie, J., Olsen, S.L., Qi, N.D., Qiu, J.F., Shang, L., Shen, C.P., Shen, X.Y., Sheng, H.Y., Sun, H.S., Sun, Y.Z., Sun, Z.J., Tang, X., Tong, G.L., Varner, G.S., Wang, L.L., Wang, L.S., Wang, P., Wang, P.L., Wang, Y.F., Wang, Z., Wang, Z.Y., Wei, C.L., Xia, X.M., Xu, X.P., Yang, M., Yang, Y.X., Ye, M.H., Ye, Y.X., Yuan, C.Z., Zhang, B.X., Zhang, B.Y., Zhang, C.C., Zhang, D.H., Zhang, F., Zhang, H.Y., Zhang, J.W., Zhang, J.Y., Zhang, X.Y., Zhang, Y.Y., Zhao, M.G., Zhao, P.P., Zhao, Z.G., Zheng, B., Zheng, H.Q., Zheng, Z.P., Zhong, B., Zhou, L., Zhu, K.J., Zhu, Q.M., Zhu, X.W., Zhu, Y.S., Zhu, Z.A., Zhu, Z.L., Zhuang, B.A., Zou, B.S.
• Format: Article
• Language: English
• Subjects: [formula omitted] decays; [formula omitted] symmetry breaking; Charged κ; Exact sciences and technology; Low mass scalar; Nuclear physics; Physics; The physics of elementary particles and fields
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2010.08.015

Based on 58×106J/ψ events collected by BESII, the decay J/ψ→K±KSπ∓π0 is studied. In the invariant mass spectrum recoiling against the charged K∗(892)±, the charged κ particle is found as a low mass enhancement. If a Breit–Wigner function of constant width is used to parameterize the κ, its pole locates at (849±77−14+18)−i(256±40−22+46) MeV/c2. Also in this channel, the decay J/ψ→K∗(892)+K∗(892)− is observed for the first time. Its branching ratio is (1.00±0.19−0.32+0.11)×10−3.