Observation Of A P(P)Over-Bar Mass Threshold Enhancement In Psi ' -> Pi(+)Pi(-)J/Psi(J/Psi -> Gamma P(P)Over-Bar) Decay

M. Ablikim, M. N. Achasov,L. An,Q. An,Z. H. An,J. Z. Bai,Y. Ban,N. Berger,J. M. Bian, I. Boyko, R. A. Briere,V. Bytev,X. Cai,G. F. Cao,X. X. Cao,J. F. Chang,G. Chelkov, G. Chen,H. S. Chen,J. C. Chen,L. P. Chen,M. L. Chen,P. Chen,S. J. Chen, Y. B. Chen,Y. P. Chu, D. Cronin-Hennessy,H. L. Dai,J. P. Dai,D. Dedovich,Z. Y. Deng, I. Denysenko,M. Destefanis,Y. Ding, L. Y. Dong, M. Y. Dong,S. X. Du,M. Y. Duan,J. Fang,C. Q. Feng,C. D. Fu,J. L. Fu, Y. Gao,C. Geng, K. Goetzen,W. X. Gong,M. Greco,S. Grishin,Y. T. Gu,A. Q. Guo,L. B. Guo, Y. P. Guo,S. Q. Han,F. A. Harris,K. L. He,M. He,Z. Y. He,Y. K. Heng,Z. L. Hou,H. M. Hu,J. F. Hu, T. Hu,X. W. Hu,B. Huang,G. M. Huang,J. S. Huang,X. T. Huang, Y. P. Huang,C. S. Ji,Q. Ji,X. B. Ji,X. L. Ji,L. K. Jia,L. L. Jiang,X. S. Jiang, J. B. Jiao,D. P. Jin,S. Jin, S. Komamiya,W. Kuehn, S. Lange,J. K. C. Leung,C. Li,C. Li, D. M. Li,F. Li,G. Li,H. B. Li,J. Li,J. C. Li,L. Li,L. Li,Q. J. Li,W. D. Li,W. G. Li,X. L. Li,X. N. Li,X. Q. Li,X. R. Li,Y. X. Li,Z. B. Li,H. Liang,T. R. Liang,Y. T. Liang,Y. F. Liang, G. R. Liao,X. T. Liao,B. J. Liu,C. L. Liu,C. X. Liu,C. Y. Liu,F. H. Liu,F. Liu,F. Liu,G. C. Liu,H. Liu,H. B. Liu,H. M. Liu,H. W. Liu,J. Liu,J. P. Liu,K. Liu,K. Y. Liu,Q. Liu,S. B. Liu,X. H. Liu,Y. B. Liu,Y. F. Liu,Y. W. Liu,Y. Liu,Z. A. Liu,G. R. Lu, J. G. Lue, Q. W. Lue, X. R. Lue,Y. P. Lu,C. L. Luo,M. X. Luo,T. Luo,X. L. Luo,C. L. Ma,F. C. Ma,H. L. Ma,Q. M. Ma,X. Ma,X. Y. Ma,M. Maggiora,Y. J. Mao,Z. P. Mao,J. Min,X. H. Mo, N. Yu. Muchnoi,Y. Nefedov,F. P. Ning,S. L. Olsen,Q. Ouyang, M. Pelizacus, K. Peters,J. L. Ping,R. G. Ping, R. Poling,C. S. J. Pun,M. Qi,S. Qian,C. F. Qiao,J. F. Qiu,G. Rong,X. D. Ruan,A. Sarantsev,M. Shao,C. P. Shen,X. Y. Shen,H. Y. Sheng,S. Sonoda,S. Spataro,B. Spruck,D. H. Sun,G. X. Sun,J. F. Sun,S. S. Sun,X. D. Sun,Y. J. Sun,Y. Z. Sun,Z. J. Sun,Z. T. Sun,C. J. Tang,X. Tang,X. F. Tang,H. L. Tian,D. Toth,G. S. Varner,X. Wan,B. Q. Wang,J. K. Wang,K. Wang,L. L. Wang,L. S. Wang,P. Wang,P. L. Wang,Q. Wang,S. G. Wang,X. D. Wang,X. L. Wang,Y. D. Wang,Y. F. Wang,Y. Q. Wang,Z. Wang,Z. G. Wang,Z. Y. Wang,D. H. Wei,S. P. Wen,U. Wiedner,L. H. Wu,N. Wu,Y. M. Wu,Z. Wu,Z. J. Xiao, Y. G. Xie,G. F. Xu,G. M. Xu, H. Xu,M. Xu,M. Xu,X. P. Xu,Y. Xu,Z. Z. Xu,Z. Xue,L. Yan,W. B. Yan,Y. H. Yan,H. X. Yang,M. Yang, P. Yang,S. M. Yang,Y. X. Yang,M. Ye,M. H. Ye,B. X. Yu,C. X. Yu,L. Yu, C. Z. Yuan,Y. Yuan,Y. Zeng,B. X. Zhang,B. Y. Zhang,C. C. Zhang,D. H. Zhang,H. H. Zhang,H. Y. Zhang,J. W. Zhang,J. Y. Zhang, J. Z. Zhang,L. Zhang,S. H. Zhang,X. Y. Zhang,Y. Zhang,Y. H. Zhang,Z. P. Zhang,C. Zhao,H. S. Zhao,J. W. Zhao,J. W. Zhao,L. Zhao,L. Zhao,M. G. Zhao,Q. Zhao,S. J. Zhao,T. C. Zhao,X. H. Zhao,Y. B. Zhao,Z. G. Zhao,A. Zhemchugov,B. Zheng,J. P. Zheng,Y. H. Zheng,Z. P. Zheng,B. Zhong,J. Zhong,L. Zhou,Z. L. Zhou, C. Zhu,K. Zhu,K. J. Zhu,Q. M. Zhu,X. W. Zhu,Y. S. Zhu,Z. A. Zhu, J. Zhuang,B. S. Zou,J. H. Zou,J. X. Zuo,P. Zweber

CHINESE PHYSICS C（2010）

Cited 0|Views216

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Abstract

The decay channel psi' -> pi(+)pi(-)J/psi(J/psi -> gamma p (p) over bar) is studied using a sample of 1.06 x 10(8) psi' events collected by the BESIII experiment at BEPCII. A strong enhancement at threshold is observed in the pp invariant mass spectrum. The enhancement can be fitted with an S-wave Breit-Wigner resonance function with a resulting peak mass of M = 1861(-13)(+6) (stat)(-26)(+7) (syst) MeV/c(2) and a narrow width that is Gamma < 38 MeV/c(2) at the 90% confidence level. These results are consistent with published BESII results. These mass and width values do not match with well established mesons.

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Key words

p(p)over-bar,threshold enhancement

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