Observation of a near-threshold enhancement in the pp mass spectrum from radiative J/psi-->gammapp decays.
J. Z. Bai,Y. Ban,J. G. Bian,XZ（蔡翔舟） Cai,J. F. Chang,H. F. Chen,H. S. Chen,J. Chen,Jie Chen,J. C. Chen,Y. B. Chen,S. P. Chi,Y. P. Chu,Xingzhu Cui,Y. M. Dai,Y. S. Dai,L. Y. Dong,S. X. Du,Z. Z. Du,W. Dunwoodie,J. Fang,S. S. Fang,C. D. Fu,H. Y. Fu,L. P. Fu,C. S. Gao,M. L. Gao,Y. N. Gao,M. Y. Gong,W. X. Gong,S. D. Gu,Y. N. Guo,Y. Q. Guo,Z. J. Guo,S. W. Han,F. A. Harris,J. J. He,K. L. He,M. He,X. H. He,Y. K. Heng,T. Hong,H. M. Hu,T. Hu,G. S. Huang,Liang Huang,Xiru Huang,Joseph Izen,X. B. Ji,Chun-Hua Jiang,X. S. Jiang,D. P. Jin,S. Jin,Y. Jin,B. D. Jones,Z. J. Ke,D. Kong,Y. F. Lai,F. Li,G. Li,H. H. Li,J. C. Li,Jiemin Li,K. Li,Q. J. Li,R. B. Li,R. Y. Li,W. D. Li,W. G. Li,X. Q. Li,Xintong Li,C. F. Liu,C. X. Liu,Fang Liu,F. Liu,H. M. Liu,J. B. Liu,J. P. Liu,R. G. Liu,Y. B. Liu,Z. A. Liu,Z. X. Liu,Xuanhong Lou,G. R. Lu,F. Lu,Houbing Lu,J. G. Lu,Z. J. Lu,X. L. Luo,E. C. Ma,F. C. Ma,Jun-Bing Ma,R. Malchow,Z. P. Mao,X. C. Meng,X. H. Mo,J. Nie,Z. D. Nie,Stephen L. Olsen,D. Paluselli,Haiping Peng,N. D. Qi,C. D. Qian,J. F. Qiu,G. Rong,D. L. Shen,H. Shen,X. Y. Shen,H. Y. Sheng,Feng Shi,L. W. Song,H. S. Sun,S.S. Sun,Y. Z. Sun,Z. J. Sun,S. Q. Tang,X. Tang,D. Tian,Yang Tian,W. H. Toki,G. L. Tong,G. S. Varner,J. Z. Wang,Jing Wang,L. S. Wang,L. S. Wang,M. Z. Wang,Meng Wang,P. Wang,P. L. Wang,W. F. Wang,Yudan Wang,Zhe Wang,Zujian Wang,Zheng Wang,Z. Y. Wang,Cunfeng Wei,N. Wu,X. M. Xia,X. X. Xie,G. F. Xu,Y. C. Xu,S. T. Xue,M. L. Yan,W. B. Yan,G. A. Yang,H. X. Yang,Jiming Yang,S. D. Yang,M. H. Ye,Y. X. Ye,J. Ying,C. S. Yu,G. W. Yu,C. Z. Yuan,J. M. Yuan,Y. Yuan,Q. Yue,S. L. Zang,Y. Zeng,B. X. Zhang,B. Y. Zhang,C. C. Zhang,D. H. Zhang,H. Y. Zhang,J. Y. Zhang,J. M. Zhang,J. W. Zhang,Lei Zhang,Qiyang Zhang,S. Q. Zhang,X. Y. Zhang,Y. J. Zhang,Yiyun Zhang,Y. Y. Zhang,Z. P. Zhang,D. X. Zhao,Jiawei Zhao,J. W. Zhao,P. P. Zhao,W. R. Zhao,Y. B. Zhao,Z. Zhao,Jinxing Zheng,L. S. Zheng,Z. P. Zheng,X. C. Zhong,Bing Zhou,Guangzhao Zhou,L. P. Zhou,Ning Zhou,K. J. Zhu,Q. M. Zhu,Yingchun Zhu,Y. C. Zhu,Y. S. Zhu,Z. A. Zhu,B. A. Zhuang,B.S. Zou +198 more
TLDR
In this paper, the authors observed a narrow enhancement near 2m(p) in the invariant mass spectrum of pp pairs from radiative J/psi-->gammapp decays.Abstract:
We observe a narrow enhancement near 2m(p) in the invariant mass spectrum of pp pairs from radiative J/psi-->gammapp decays. No similar structure is seen in J/psi-->pi(0)pp decays. The results are based on an analysis of a 58 x 10(6) event sample of J/psi decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an S- or P-wave Breit-Wigner resonance function. In the case of the S-wave fit, the peak mass is below 2m(p) at M=1859(+3)(-10) (stat)+5-25(syst) MeV/c(2) and the total width is Gamma<30 MeV/c(2) at the 90% confidence level. These mass and width values are not consistent with the properties of any known particle.read more
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