Observation Of Two New N* Peaks In J/Psi -> P Pi- (N)Over-Bar And P Pi+ (N)Over-Bar Decays

M. Ablikim,J. Bai, Y. Ban,J. Bian, X. Cai,J. Chang, H. Chen,J. Chen,Jin Chen,Jun Chen,M. Chen, Y. Chen,S. Chi,Y. Chu,X. Cui,H. Dai,Y. Dai,Z. Deng,L. Dong,S. Du,Z. Du, J. Fang,S. Fang, C. Fu,H. Fu,C. Gao, Y. Gao, M. Gong,W. Gong,S. Gu,Y. Guo, Z. Guo,F. Harris,K. He, M. He,X. He, Y. Heng,H. Hu, T. Hu, G. Huang, L. Huang,X. Huang,X. Ji,Q. Jia,C. Jiang,X. Jiang,D. Jin, S. Jin, Y. Jin, Y. Lai, F. Li,G. Li,H. Li,J. Li,Q. Li, R. Li,S. Li, W. Li,X. Li, Y. Liang,H. Liao, C. Liu, F. Liu, Fang Liu,H. Liu,J. Liu,R. Liu,Z. Liu,F. Lu,G. Lu,J. Lu,C. Luo, X. Luo,F. Ma,J. Ma,L. Ma,Q. Ma,X. Ma,Z. Mao, X. Mo, J. Nie,Z. Nie,S. Olsen,H. Peng,N. Qi,C. Qian, H. Qin, J. Qiu,Z. Ren,G. Rong,L. Shan,L. Shang,D. Shen,X. Shen, H. Sheng,F. Shi,X. Shi,H. Sun,S. Sun,Y. Sun,Z. Sun, X. Tang,N. Tao,Y. Tian,G. Tong, G. Varner, D. Wang, J. Wang,K. Wang, L. Wang,M. Wang,P. Wang,S. Wang, W. Wang,Y. Wang,Zhe Wang,Z. Wang, Zheng Wang, Z. Wang,C. Wei,D. Wei,N. Wu,Y. Wu,X. Xia,X. Xie,B. Xin,G. Xu, H. Xu, Y. Xu,S. Xue, M. Yan,F. Yang,H. Yang,J. Yang,S. Yang, Y. Yang,M. Ye,Y. Ye,L. Yi,Z. Yi,C. Yu, G. Yu,C. Yuan, J. Yuan,Y. Yuan,Q. Yue,S. Zang,Yu. Zeng,Y. Zeng,B. Zhang, C. Zhang, D. Zhang,H. Zhang, J. Zhang, L. Zhang,Q. Zhang,S. Zhang,X. Zhang,Y. Zhang,Yiyun Zhang,Z. Zhang, D. Zhao,J. Zhao,M. Zhao,P. Zhao,W. Zhao,X. Zhao,Y. Zhao,Z. Zhao, H. Zheng, J. Zheng,L. Zheng,Z. Zheng,X. Zhong, B. Zhou,G. Zhou, L. Zhou,N. Zhou, K. Zhu, Q. Zhu,Y. Zhu,Yingchun Zhu, Z. Zhu,B. Zhuang,B. Zou.

PHYSICAL REVIEW LETTERS（2006）

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摘要

The decay J/psi ->(N) over barN pi provides an effective isospin 1/2 filter for the pi N system due to isospin conservation. Using 58x10(6) J/psi decays collected with the Beijing Electromagnetic Spectrometer at the Beijing Electron Positron Collider, more than 100 thousand J/psi -> p pi(-)<<(n)over bar>+c.c. events are obtained. Besides the two well-known N-* peaks at around 1500 MeV/c(2) and 1670 MeV/c(2), there are two new, clear N-* peaks in the p pi invariant mass spectrum around 1360 MeV/c(2) and 2030 MeV/c(2) with statistical significance of 11 sigma and 13 sigma, respectively. We identify these as the first direct observation of the N-*(1440) peak and a long-sought missing N-* peak above 2 GeV/c(2) in the pi N invariant mass spectrum.

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