标题：OBSERVATION OF A P MASS THRESHOLD ENHANCEMENT IN Ψ′→Π+Π-J/Ψ(J/Ψ→ΓP) DECAY
作者：麦迪娜;M. N. ACHASOV;安磊;安琪;安正华;白景芝;班勇;N. BERGER;边渐鸣;I. BOYKO;R. A. BRIERE;V. BYTEV;蔡啸;曹国富;曹学香;常劲帆;G. CHELKOV;陈刚;陈和生;陈江 更多麦迪娜;M. N. ACHASOV;安磊;安琪;安正华;白景芝;班勇;N. BERGER;边渐鸣;I. BOYKO;R. A. BRIERE;V. BYTEV;蔡啸;曹国富;曹学香;常劲帆;G. CHELKOV;陈刚;陈和生;陈江川;陈丽平;陈玛丽;陈鹏; 收起
作者机构：[Ablikim, M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Achasov, M.N] G. I. Budker Institute of Nuclear Physics SB RAS (BINP), Nov 更多[Ablikim, M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Achasov, M.N] G. I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russian Federation;[ An, L] Guangxi University, Naning 530004, China;[ An, Q] University of Science and Technology of China, Hefei 230026, China;[ An, Z.H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Bai, J.Z] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ban, Y] Peking University, Beijing 100871, China;[ Berger, N] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Bian, J.M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Boyko, I] Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation;[ Briere, R.A] Carnegie Mellon University, Pittsburgh, PA 15213, United States;[ Bytev, V] Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation;[ Cai, X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Cao, G.F] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Cao, X.X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Chang, J.F] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Chelkov, G] Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation;[ Chen, G] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Chen, H.S] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Chen, J.C] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Chen, L.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Chen, M.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Chen, P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Chen, S.J] Nanjing University, Nanjing 210093, China;[ ChenY.B] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Chu, Y.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Cronin-Hennessy, D] University of Minnesota, Minneapolis, MN 55455, United States;[ Dai, H.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Dai, J.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Dedovich, D] Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation;[ Deng, Z.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Denysenko, I] Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation, Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine;[ Destefanis, M] University of Turin and INFN, Turin, Italy;[ Ding, Y] Liaoning University, Shenyang 110036, China;[ Dong, L.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Dong, M.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Du, S.X] Zhengzhou University, Zhengzhou 450001, China;[ Duan, M.Y] Shanxi University, Taiyuan 030006, China;[ Fang, J] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Feng, C.Q] University of Science and Technology of China, Hefei 230026, China;[ Fu, C.D] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Fu, J.L] Nanjing University, Nanjing 210093, China;[ Gao, Y] Tsinghua University, Beijing 100084, China;[ Geng, C] University of Science and Technology of China, Hefei 230026, China;[ Goetzen, K] GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany;[ Gong, W.X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Greco, M] University of Turin and INFN, Turin, Italy;[ Grishin, S] Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation;[ Gu, Y.T] Guangxi University, Naning 530004, China;[ Guo, A.Q] Nankai University, Tianjin 300071, China;[ Guo, L.B] Nanjing Normal University, Nanjing 210046, China;[ Guo, Y.P] Nankai University, Tianjin 300071, China;[ Han, S.Q] Nanjing Normal University, Nanjing 210046, China;[ Harris, F.A] University of Hawaii, Honolulu, HI 96822, United States;[ He, K.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ He, M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ He, Z.Y] Nankai University, Tianjin 300071, China;[ Heng, Y.K] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Hou, Z.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Hu, H.M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Hu, J.F] Graduate University, Chinese Academy of Sciences, Beijing 100049, China;[ Hu, T] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Hu, X.W] Nanjing University, Nanjing 210093, China;[ Huang, B] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Huang, G.M] Huazhong Normal University, Wuhan 430079, China;[ Huang, J.S] Henan Normal University, Xinxiang 453007, China;[ Huang, X.T] Shandong University, Jinan 250100, China;[ Huang, Y.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ji, C.S] University of Science and Technology of China, Hefei 230026, China;[ Ji, Q] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ji, X.B] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ji, X.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Jia, L.K] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Jiang, L.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Jiang, X.S] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Jiao, J.B] Shandong University, Jinan 250100, China;[ Jin, D.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Jin, S] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Komamiya, S] University of Tokyo, Tokyo 113-0033, Japan;[ Kuehn, W] Universitaet Giessen, 35392 Giessen, Germany;[ Lange, S] Universitaet Giessen, 35392 Giessen, Germany;[ Leung, J.K.C] University of Hong Kong, Pokfulam, Hong Kong;[ Li, C] University of Science and Technology of China, Hefei 230026, China;[ Li, C] University of Science and Technology of China, Hefei 230026, China;[ Li, D.M] Zhengzhou University, Zhengzhou 450001, China;[ Li, F] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, G] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, H.B] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, J] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, J.C] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, Q.J] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, W.D] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, W.G] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, X.L] Shandong University, Jinan 250100, China;[ Li, X.N] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, X.Q] Nankai University, Tianjin 300071, China;[ Li, X.R] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Li, Y.X] Zhengzhou University, Zhengzhou 450001, China;[ Li, Z.B] Sun Yat-Sen University, Guangzhou 510275, China;[ Liang, H] University of Science and Technology of China, Hefei 230026, China;[ Liang, T.R] Nankai University, Tianjin 300071, China;[ Liang, Y.T] Universitaet Giessen, 35392 Giessen, Germany;[ Liang, Y.F] Sichuan University, Chengdu 610064, China;[ Liao, G.R] Guangxi Normal University, Guilin 541004, China;[ Liao, X.T] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, B.J] Chinese University of Hong Kong, Shatin, Hong Kong, University of Hong Kong, Pokfulam, Hong Kong;[ Liu, C.L] Carnegie Mellon University, Pittsburgh, PA 15213, United States;[ Liu, C.X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, C.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, F.H] Shanxi University, Taiyuan 030006, China;[ Liu, F] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, F] Huazhong Normal University, Wuhan 430079, China;[ Liu, G.C] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, H.B] Graduate University, Chinese Academy of Sciences, Beijing 100049, China;[ Liu, H.M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, H.W] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, J] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, J.P] Wuhan University, Wuhan 430072, China;[ Liu, K] Peking University, Beijing 100871, China;[ Liu, K.Y] Liaoning University, Shenyang 110036, China;[ Liu, Q] University of Hawaii, Honolulu, HI 96822, United States;[ Liu, S.B] University of Science and Technology of China, Hefei 230026, China;[ Liu, X.H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, Y.B] Nankai University, Tianjin 300071, China;[ Liu, Y.F] Nankai University, Tianjin 300071, China;[ Liu, Y.W] University of Science and Technology of China, Hefei 230026, China;[ Liu, Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Liu, Z.A] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Lu, G.R] Henan Normal University, Xinxiang 453007, China;[ Lü, J.G] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Lü, Q.W] Shanxi University, Taiyuan 030006, China;[ Lü, X.R] Graduate University, Chinese Academy of Sciences, Beijing 100049, China;[ Lu, Y.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Luo, C.L] Nanjing Normal University, Nanjing 210046, China;[ Luo, M.X] Zhejiang University, Hangzhou 310027, China;[ Luo, T] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Luo, X.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ma, C.L] Graduate University, Chinese Academy of Sciences, Beijing 100049, China;[ Ma, F.C] Liaoning University, Shenyang 110036, China;[ Ma, H.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ma, Q.M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ma, X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ma, X.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Maggiora, M] University of Turin and INFN, Turin, Italy;[ Mao, Y.J] Peking University, Beijing 100871, China;[ Mao, Z.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Min, J] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Mo, X.H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Muchnoi, N.Yu] G. I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russian Federation;[ Nefedov, Y] Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation;[ Ning, F.P] Shanxi University, Taiyuan 030006, China;[ Olsen, S.L] Seoul National University, 151-747 Seoul, South Korea;[ Ouyang, Q] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Pelizaeus, M] Bochum Ruhr-University, 44780 Bochum, Germany;[ Peters, K] GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany;[ Ping, J.L] Nanjing Normal University, Nanjing 210046, China;[ Ping, R.G] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Poling, R] University of Minnesota, Minneapolis, MN 55455, United States;[ Pun, C.S.J] University of Hong Kong, Pokfulam, Hong Kong;[ Qi, M] Nanjing University, Nanjing 210093, China;[ Qian, S] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Qiao, C.F] Graduate University, Chinese Academy of Sciences, Beijing 100049, China;[ Qiu, J.F] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Rong, G] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ruan, X.D] Guangxi University, Naning 530004, China;[ Sarantsev, A] Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation, PNPI, Gatchina, Russian Federation;[ Shao, M] University of Science and Technology of China, Hefei 230026, China;[ Shen, C.P] Seoul National University, 151-747 Seoul, South Korea;[ Shen, X.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Sheng, H.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Sonoda, S] University of Tokyo, Tokyo 113-0033, Japan;[ Spataro, S] University of Turin and INFN, Turin, Italy;[ Spruck, B] Universitaet Giessen, 35392 Giessen, Germany;[ Sun, D.H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Sun, G.X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Sun, J.F] Henan Normal University, Xinxiang 453007, China;[ Sun, S.S] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Sun, X.D] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Sun, Y.J] University of Science and Technology of China, Hefei 230026, China;[ Sun, Y.Z] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Sun, Z.J] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Sun, Z.T] University of Science and Technology of China, Hefei 230026, China;[ Tang, C.J] Sichuan University, Chengdu 610064, China;[ Tang, X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Tang, X.F] Guangxi Normal University, Guilin 541004, China;[ Tian, H.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Toth, D] University of Minnesota, Minneapolis, MN 55455, United States;[ Varner, G.S] University of Hawaii, Honolulu, HI 96822, United States;[ Wan, X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, B.Q] Peking University, Beijing 100871, China;[ Wang, J.K] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, K] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, L.L] China Center of Advanced Science and Technology, Beijing 100190, China;[ Wang, L.S] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, P.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, Q] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, S.G] Peking University, Beijing 100871, China;[ Wang, X.D] Shanxi University, Taiyuan 030006, China;[ Wang, X.L] University of Science and Technology of China, Hefei 230026, China;[ Wang, Y.D] University of Science and Technology of China, Hefei 230026, China;[ Wang, Y.F] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, Y.Q] Shandong University, Jinan 250100, China;[ Wang, Z] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, Z.G] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wang, Z.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wei, D.H] Guangxi Normal University, Guilin 541004, China;[ Wen, S.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wiedner, U] Bochum Ruhr-University, 44780 Bochum, Germany;[ Wu, L.H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wu, N] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wu, Y.M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Wu, Z] Nanjing Normal University, Nanjing 210046, China;[ Xiao, Z.J] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Xie, Y.G] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Xu, G.F] Peking University, Beijing 100871, China;[ Xu, G.M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Xu, H] University of Science and Technology of China, Hefei 230026, China;[ Xu, M] Guangxi University, Naning 530004, China;[ Xu, M] Huazhong Normal University, Wuhan 430079, China;[ Xu, X.P] Huazhong Normal University, Wuhan 430079, China, Suzhou University, Suzhou 215006, China;[ Xu, Y] Nankai University, Tianjin 300071, China;[ Xu, Z.Z] University of Science and Technology of China, Hefei 230026, China;[ Xue, Z] University of Science and Technology of China, Hefei 230026, China;[ Yan, L] University of Science and Technology of China, Hefei 230026, China;[ Yan, W.B] University of Science and Technology of China, Hefei 230026, China;[ Yan, Y.H] Hunan University, Changsha 410082, China;[ Yang, H.X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Yang, M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Yang, P] Nankai University, Tianjin 300071, China;[ Yang, S.M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Yang, Y.X] Guangxi Normal University, Guilin 541004, China;[ Ye, M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Ye, M.H] China Center of Advanced Science and Technology, Beijing 100190, China;[ Yu, B.X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Yu, C.X] Nankai University, Tianjin 300071, China;[ Yu, L] Huazhong Normal University, Wuhan 430079, China;[ Yuan, C.Z] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Yuan, Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zeng, Y] Hunan University, Changsha 410082, China;[ Zhang, B.X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, B.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, C.C] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, D.H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, H.H] Sun Yat-Sen University, Guangzhou 510275, China;[ Zhang, H.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, J.W] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, J.Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, J.Z] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, L] Nanjing University, Nanjing 210093, China;[ Zhang, S.H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, X.Y] Shandong University, Jinan 250100, China;[ Zhang, Y] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, Y.H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhang, Z.P] University of Science and Technology of China, Hefei 230026, China;[ Zhao, C] University of Science and Technology of China, Hefei 230026, China;[ Zhao, H.S] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhao, J.W] University of Science and Technology of China, Hefei 230026, China;[ Zhao, J.W] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhao, L] University of Science and Technology of China, Hefei 230026, China;[ Zhao, L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhao, M.G] Nankai University, Tianjin 300071, China;[ Zhao, Q] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhao, S.J] Zhengzhou University, Zhengzhou 450001, China;[ Zhao, T.C] University of Washington, Seattle, WA 98195, United States;[ Zhao, X.H] Nanjing University, Nanjing 210093, China;[ Zhao, Y.B] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhao, Z.G] University of Science and Technology of China, Hefei 230026, China;[ Zhemchugov, A] Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation, Moscow Institute of Physics and Technology, Moscow, Russian Federation;[ Zheng, B] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zheng, J.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zheng, Y.H] Graduate University, Chinese Academy of Sciences, Beijing 100049, China;[ Zheng, Z.P] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhong, B] Nanjing Normal University, Nanjing 210046, China;[ Zhong, J] Bochum Ruhr-University, 44780 Bochum, Germany;[ Zhou, L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhou, Z.L] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhu, C] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhu, K] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhu, K.J] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhu, Q.M] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhu, X.W] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhu, Y.S] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhu, Z.A] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zhuang, J] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zou, B.S] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zou, J.H] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zuo, J.X] Institute of High Energy Physics, CAS, Beijing 100049, China;[ Zweber, P] University of Minnesota, Minneapolis, MN 55455, United States 收起
通讯作者地址：[Ablikim, M]CAS, Inst High Energy Phys, Beijing 100049, Peoples R China.
来源：中国物理C
出版年：2010
卷：34
期：4
页码：421-426
关键词：p(p);threshold enhancement
摘要：The decay channel ψ′→π~+π~-J/ψ(J/ψ→γp(p)) is studied using a sample of 1.06 × 10~8 ψ′ events collected by the BESⅢ experiment at BEPCⅡ. A strong enhancement at threshold is observed in the p(p) 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 Γ＜ 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.
