Observation of a structure at 1.84 GeV/c(2) in the 3(pi(+)pi( )) mass spectrum in J/psi > gamma 3(pi(+) pi( )) decays

M. Ablikim, H.X. Yang,Z.P. Zhang,B.Q. Wang, T. Hussain,H.W. Yu,T. Held,C.L. Liu, G.S. Varner,F.H. Liu, W.X. Gong,Z.Y. He, X. Tang, Q.A. Malik,Ling Zhao,J.F. Qiu,Z.Y. Zhang,R.A. Briere, Q.G. Wen,H.B. Liu,A. Zhemchugov, K. Goetzen,J.S. Yu,S.L. Olsen,H.M. Hu,K. Peters,I. Tapan,Y.G. Xie,L.S. Wang, X. Chen,Y.F. Wang,Z.Y. Deng, S.A. Cetin,J.W. Zhang,M. Wang,S. Pacetti, B. Zheng, Y.P. Chu,Z.G. Zhao, Y.J. Mao, I. Boyko,S.X. Du,H.L. Dai,M. Destefanis, G.M. Huang,H.P. Cheng,Fang Liu,D. Wang,M. Leyhe,Y.P. Guo,Y.B. Zhao,X.H. Zhao,P.L. Wang,T. Ma,Y.H. Zhang,H.Y. Zhang, K.Y. Liu,C.C. Zhang, O. Fuks, Y. Huang,J.Y. Zhang,M.N. Achasov,C.H. Li, K. Moriya, K. Liu,U. Wiedner, Y.H. Guan,B.Y. Zhang, T. Hu,X.F. Wang,X.T. Huang,Z.B. Li,Z. Jiao,X.Y. Song,D. Lin,J.C. Li, J.L. Ping, R.E. Mitchell,Y.M. Zhu,G. Rong,Lei Li,H.Y. Sheng,D.M. Li, E. Prencipe,Y.C. Zhu, Z. Ning,Y.J. Sun,A. Calcaterra,Feng Liu,X.L. Li,T.C. Zhao,N. Wu,S.S. Fang,L. Zhou, F.C. Ma,I. Uman, A.Q. Guo,B.J. Liu, A. Sarantsev,W. Wu,C.Z. Yuan,L.G. Xia,Q.P. Ji,W.G. Li, L.Q. Qin,H.H. Liu, Q. An, A. Denig, J.S. Lange, D. Dedovich,LiLi Zhang, J.S. Huang,A. Zallo, C.X. Yu,D.Y. Wang,Z.R. Xu,J.Z. Zhang, C.D. Fu,O. Cakir, K.L. He,E.H. Thorndike,J.P. Zheng,S.L. Zang,M. Shao, Z.A. Zhu, M. Qi,Z.A. Liu,S.P. Wen, G.F. Cao,O. Bondarenko, Z. Xue,O. Albayrak,X.K. Zhou, X.Y. Shen, Y.B. Liu, G.F. Xu, C.F. Qiao, X.R. Chen,Z.Y. Wang, Y.T. Gu,J.C. Chen,S.J. Chen,H.B. Li,X.L. Wang,J.B. Jiao,Y. Nefedov, F.E. Maas,X.B. Ji,M. Ye,L. Fava, F.F. An, H.J. Lu,L.L. Jiang, X.T. Liao,R.Baldini Ferroli, G.M. Xu, H. Liang,Y.H. Zheng, Y.X. Xia,Y.Q. Wang,J.Q. Zhang,H. Liu, L.H. Wu, M. He,Z.T. Sun, B.X. Yu,Z.H. Qin,J.L. Fu, N. Kalantar-Nayestanaki, Y. Ding,G. Zhao, Z. Wang, X. Cai,C. Nicholson, D.H. Sun,C.L. Luo,Q. Ouyang,Y. Zhang,C. Zhu,C.P. Shen,L. Yan,B. Spruck,K.X. Zhao, H.P. Peng,M.X. Luo,Y.S. Zhu,Zhiqing Liu,Q. Liu, M. Pelizaeus,Q. Ji,Y.D. Wang, Y.P. Lu, J. Fang,S.L. Li,H. Ye,Z.J. Sun,W.D. Li,X.L. Luo, L.Y. Dong,J.B. Wei, B. Zhong,R. Poling,S.B. Liu, J. Min,X. Zhou, W. Gradl, T.J. Min,P.L. Liu, L.B. Guo,Q. Zhao,B.S. Zou,Cui Li, C.Q. Feng, X.S. Jiang,X.L. Ji, H. Loehner,H. Muramatsu,G. Li, C.J. Tang,C.X. Liu,M. Ullrich, E. Boger, M. Maggiora,Z.L. Hou,S.H. Zhu, Z.P. Mao,J. Becker,Zhiqiang Liu, Y.H. Yan, X.R. Li,J.F. Chang,M. Kavatsyuk,H.M. Liu, M.L. Chen,S. Qian, M.R. Shepherd, Z.G. Wang,Cheng Li,C. Hu,B. Wang,Y.B. Chen, F.A. Harris, X.P. Xu,X.J. Zhang, S.G. Wang,K. Wang,X.Y. Ma,J.F. Sun,Y.Z. Sun, C. Geng,C. Morales Morales,S.S. Sun, M. Bertani, K.J. Zhu,C. Zhang,J.Z. Bai,M.H. Ye, Q.M. Ma, K.H. Rashid, X.C. Lou,Q.J. Wang, D.P. Jin,Y. Ban,S.J. Zhao,M.G. Zhao, H.L. Ma, K. Zhu, V. Bytev,J.W. Zhao, J.M. Bian,K. Li, D. Cronin-Hennessy, Y. Zeng, Y. Yang,P. Wang, D.H. Wei,M.H. Gu,H. Moeini, T. Luo, J.G. Messchendorp, R.G. Ping, G.R. Lu,H.S. Chen,S.P. Yu,N.Yu. Muchnoi,D.H. Zhang,J.H. Zou, M. Greco,X.N. Li,H.S. Zhao,Y.F. Liang, G.R. Liao,P. Weidenkaff, X.D. Ruan, C.S. Ji,Z. Wu, G.S. Huang,X.Q. Li, J.V. Bennett, Q.J. Xu,X.R. Zhou, I. Denysenko,S.H. Zhang, Y. Gao,M. Kornicer, I.B. Nikolaev, G. Chen,T. Guo,W.M. Song,P. Larin, L. Huang,Lei Zhao, M.Y. Dong, M. Lv,W. Lai, X.H. Mo,W. Kuehn,X.S. Qin,J.F. Hu, P. Friedel,Y. Qin,H.H. Zhang,Q.J. Li,D. Toth,L.L. Wang,W.B. Yan, S. Spataro,F.F. Jing,J.W. Park,R. Zhang,X.Y. Zhang, F. Li,Z.J. Xiao,Y.T. Liang,B.X. Zhang, J.P. Dai, Q.N. Xu, J.G. Lu,M. Werner, X.R. Lu,X. Liu, A.A. Zafar, C.L. Ma,B. Kopf,J. Zhuang,S.X. Wu, S. Jin,M. Lara,Y. Yuan,Q.L. Xiu, Y.X. Yang,Zhenghao Zhang, G. Chelkov, H. Cai, D.J. Ambrose,W.M. Ding,H.W. Liu,X.L. Zhu, Q.W. Lu,Y.K. Heng, G.X. Sun, J.P. Liu,Y.L. Han,S. Ma

user-5ebe28ba4c775eda72abcdf3（2013）

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摘要

With a sample of 225.3 x 10(6) J/psi events taken with the BESIII detector, the decay J/psi -> gamma 3(pi(+) pi(-)) is analyzed. A structure at 1.84 GeV/c(2) is observed in the 3(pi(+) pi(-)) invariant mass spectrum with a statistical significance of 7.6 sigma. The mass and width are measured to be M = 1842.2 +/- 4.2(-2.6)(+7.1) MeV/c(2) and Gamma = 83 +/- 14 +/- 11 MeV. The product branching fraction is determined to be B(J/psi -> gamma X(1840) x B(X(1840) -> 3(pi(+)pi(-))) = (2.44 +/- 0.36(-0.74)(+0.60)) x 10(-5). No eta' signals are observed in the 3(pi(+) pi(-)) invariant mass spectrum, and the upper limit of the branching fraction for the decay eta' -> 3(pi(+) pi(-)) is set to be 3.1 x 10(-5) at a 90% confidence level.

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关键词

Pi,Physics,Nuclear physics,Mass spectrum,Mass enhancement,Invariant mass,Electron–positron annihilation,Branching fraction,Analytical chemistry

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