Observation and study of the decay J/ψϕηη

Ablikim, M. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Achasov, M. N. (G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia) ; Ahmed, S. (Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Albrecht, M. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Alekseev, M. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Amoroso, A. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; An, F. F. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; An, Q. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Bai, J. Z. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Bai, Y. (Southeast University, Nanjing 211100, People’s Republic of China) ; Bakina, O. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Baldini Ferroli, R. (INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy) ; Ban, Y. (Peking University, Beijing 100871, People’s Republic of China) ; Begzsuren, K. (Institute of Physics and Technology, Peace Ave. 54B, Ulaanbaatar 13330, Mongolia) ; Bennett, D. W. (Indiana University, Bloomington, Indiana 47405, USA) ; Bennett, J. V. (Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA) ; Berger, N. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Bertani, M. (INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy) ; Bettoni, D. (INFN Sezione di Ferrara, I-44122, Ferrara, Italy) ; Bianchi, F. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Boger, E. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Boyko, I. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Briere, R. A. (Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA) ; Cai, H. (Wuhan University, Wuhan 430072, People’s Republic of China) ; Cai, X. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Cakir, O. (Ankara University, 06100 Tandogan, Ankara, Turkey) ; Calcaterra, A. (INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy) ; Cao, G. F. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Cetin, S. A. (Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey) ; Chai, J. (INFN, I-10125, Turin, Italy) ; Chang, J. F. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Chelkov, G. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Chen, G. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Chen, H. S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Chen, J. C. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Chen, M. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Chen, P. L. (University of South China, Hengyang 421001, People’s Republic of China) ; Chen, S. J. (Nanjing University, Nanjing 210093, People’s Republic of China) ; Chen, X. R. (Lanzhou University, Lanzhou 730000, People’s Republic of China) ; Chen, Y. B. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Cheng, W. (INFN, I-10125, Turin, Italy) ; Chu, X. K. (Peking University, Beijing 100871, People’s Republic of China) ; Cibinetto, G. (INFN Sezione di Ferrara, I-44122, Ferrara, Italy) ; Cossio, F. (INFN, I-10125, Turin, Italy) ; Dai, H. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Dai, J. P. (Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China) ; Dbeyssi, A. (Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Dedovich, D. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Deng, Z. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Denig, A. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Denysenko, I. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Destefanis, M. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; De Mori, F. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Ding, Y. (Liaoning University, Shenyang 110036, People’s Republic of China) ; Dong, C. (Nankai University, Tianjin 300071, People’s Republic of China) ; Dong, J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Dong, L. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Dong, M. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Dou, Z. L. (Nanjing University, Nanjing 210093, People’s Republic of China) ; Du, S. X. (Zhengzhou University, Zhengzhou 450001, People’s Republic of China) ; Duan, P. F. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Fang, J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Fang, S. S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Fang, Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Farinelli, R. (INFN Sezione di Ferrara, I-44122, Ferrara, Italy) (University of Ferrara, I-44122, Ferrara, Italy) ; Fava, L. (University of Eastern Piedmont, I-15121, Alessandria, Italy) (INFN, I-10125, Turin, Italy) ; Fegan, S. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Feldbauer, F. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Felici, G. (INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy) ; Feng, C. Q. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Fioravanti, E. (INFN Sezione di Ferrara, I-44122, Ferrara, Italy) ; Fritsch, M. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Fu, C. D. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Gao, Q. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Gao, X. L. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Gao, Y. (Tsinghua University, Beijing 100084, People’s Republic of China) ; Gao, Y. G. (Central China Normal University, Wuhan 430079, People’s Republic of China) ; Gao, Z. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Garillon, B. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Garzia, I. (INFN Sezione di Ferrara, I-44122, Ferrara, Italy) ; Gilman, A. (University of Minnesota, Minneapolis, Minnesota 55455, USA) ; Goetzen, K. (GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany) ; Gong, L. (Nankai University, Tianjin 300071, People’s Republic of China) ; Gong, W. X. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Gradl, W. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Greco, M. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Gu, M. H. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Gu, Y. T. (Guangxi University, Nanning 530004, People’s Republic of China) ; Guo, A. Q. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Guo, R. P. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Guo, Y. P. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Guskov, A. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Haddadi, Z. (KVI-CART, University of Groningen, NL-9747 AA Groningen, Netherlands) ; Han, S. (Wuhan University, Wuhan 430072, People’s Republic of China) ; Hao, X. Q. (Henan Normal University, Xinxiang 453007, People’s Republic of China) ; Harris, F. A. (University of Hawaii, Honolulu, Hawaii 96822, USA) ; He, K. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; He, X. Q. (University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China) ; Heinsius, F. H. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Held, T. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Heng, Y. K. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Hou, Z. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Hu, H. M. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Hu, J. F. (Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China) ; Hu, T. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Hu, Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Huang, G. S. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Huang, J. S. (Henan Normal University, Xinxiang 453007, People’s Republic of China) ; Huang, X. T. (Shandong University, Jinan 250100, People’s Republic of China) ; Huang, X. Z. (Nanjing University, Nanjing 210093, People’s Republic of China) ; Huang, Z. L. (Liaoning University, Shenyang 110036, People’s Republic of China) ; Hussain, T. (University of the Punjab, Lahore-54590, Pakistan) ; Ikegami Andersson, W. (Uppsala University, Box 516, SE-75120 Uppsala, Sweden) ; Irshad, M. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Ji, Q. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Ji, Q. P. (Henan Normal University, Xinxiang 453007, People’s Republic of China) ; Ji, X. B. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Ji, X. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Jiang, X. S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Jiang, X. Y. (Nankai University, Tianjin 300071, People’s Republic of China) ; Jiao, J. B. (Shandong University, Jinan 250100, People’s Republic of China) ; Jiao, Z. (Huangshan College, Huangshan 245000, People’s Republic of China) ; Jin, D. P. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Jin, S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Jin, Y. (University of Jinan, Jinan 250022, People’s Republic of China) ; Johansson, T. (Uppsala University, Box 516, SE-75120 Uppsala, Sweden) ; Julin, A. (University of Minnesota, Minneapolis, Minnesota 55455, USA) ; Kalantar-Nayestanaki, N. (KVI-CART, University of Groningen, NL-9747 AA Groningen, Netherlands) ; Kang, X. S. (Nankai University, Tianjin 300071, People’s Republic of China) ; Kavatsyuk, M. (KVI-CART, University of Groningen, NL-9747 AA Groningen, Netherlands) ; Ke, B. C. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Keshk, I. K. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Khan, T. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Khoukaz, A. (University of Muenster, Wilhelm-Klemm-Str. 9, 48149 Muenster, Germany) ; Kiese, P. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Kiuchi, R. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Kliemt, R. (GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany) ; Koch, L. (Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany) ; Kolcu, O. B. (Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey) ; Kopf, B. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Kornicer, M. (University of Hawaii, Honolulu, Hawaii 96822, USA) ; Kuemmel, M. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Kuessner, M. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Kupsc, A. (Uppsala University, Box 516, SE-75120 Uppsala, Sweden) ; Kurth, M. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Kühn, W. (Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany) ; Lange, J. S. (Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany) ; Larin, P. (Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Lavezzi, L. (INFN, I-10125, Turin, Italy) ; Leithoff, H. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Li, C. (Uppsala University, Box 516, SE-75120 Uppsala, Sweden) ; Li, Cheng (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Li, D. M. (Zhengzhou University, Zhengzhou 450001, People’s Republic of China) ; Li, F. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Li, F. Y. (Peking University, Beijing 100871, People’s Republic of China) ; Li, G. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Li, H. B. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Li, H. J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Li, J. C. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Li, J. W. (Soochow University, Suzhou 215006, People’s Republic of China) ; Li, Jin (Seoul National University, Seoul, 151-747 Korea) ; Li, K. J. (Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China) ; Li, Kang (Hangzhou Normal University, Hangzhou 310036, People’s Republic of China) ; Li, Ke (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Li, Lei (Beijing Institute of Petrochemical Technology, Beijing 102617, People’s Republic of China) ; Li, P. L. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Li, P. R. (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) (China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China) ; Li, Q. Y. (Shandong University, Jinan 250100, People’s Republic of China) ; Li, W. D. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Li, W. G. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Li, X. L. (Shandong University, Jinan 250100, People’s Republic of China) ; Li, X. N. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Li, X. Q. (Nankai University, Tianjin 300071, People’s Republic of China) ; Li, Z. B. (Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China) ; Liang, H. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Liang, Y. F. (Sichuan University, Chengdu 610064, People’s Republic of China) ; Liang, Y. T. (Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany) ; Liao, G. R. (Guangxi Normal University, Guilin 541004, People’s Republic of China) ; Liao, L. Z. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Libby, J. (Indian Institute of Technology Madras, Chennai 600036, India) ; Lin, C. X. (Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China) ; Lin, D. X. (Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Liu, B. (Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China) ; Liu, B. J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Liu, C. X. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Liu, D. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Liu, D. Y. (Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China) ; Liu, F. H. (Shanxi University, Taiyuan 030006, People’s Republic of China) ; Liu, Fang (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Liu, Feng (Central China Normal University, Wuhan 430079, People’s Republic of China) ; Liu, H. B. (Guangxi University, Nanning 530004, People’s Republic of China) ; Liu, H. L. (Southeast University, Nanjing 211100, People’s Republic of China) ; Liu, H. M. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Liu, Huanhuan (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Liu, Huihui (Henan University of Science and Technology, Luoyang 471003, People’s Republic of China) ; Liu, J. B. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Liu, J. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Liu, K. (Tsinghua University, Beijing 100084, People’s Republic of China) ; Liu, K. Y. (Liaoning University, Shenyang 110036, People’s Republic of China) ; Liu, Ke (Central China Normal University, Wuhan 430079, People’s Republic of China) ; Liu, L. D. (Peking University, Beijing 100871, People’s Republic of China) ; Liu, Q. (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Liu, S. B. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Liu, X. (Lanzhou University, Lanzhou 730000, People’s Republic of China) ; Liu, Y. B. (Nankai University, Tianjin 300071, People’s Republic of China) ; Liu, Z. A. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Liu, Zhiqing (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Long, Y. F. (Peking University, Beijing 100871, People’s Republic of China) ; Lou, X. C. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Lu, H. J. (Huangshan College, Huangshan 245000, People’s Republic of China) ; Lu, J. G. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Lu, Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Lu, Y. P. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Luo, C. L. (Nanjing Normal University, Nanjing 210023, People’s Republic of China) ; Luo, M. X. (Zhejiang University, Hangzhou 310027, People’s Republic of China) ; Luo, T. (Fudan University, Shanghai 200443, People’s Republic of China) ; Luo, X. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Lusso, S. (INFN, I-10125, Turin, Italy) ; Lyu, X. R. (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Ma, F. C. (Liaoning University, Shenyang 110036, People’s Republic of China) ; Ma, H. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Ma, L. L. (Shandong University, Jinan 250100, People’s Republic of China) ; Ma, M. M. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Ma, Q. M. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Ma, T. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Ma, X. N. (Nankai University, Tianjin 300071, People’s Republic of China) ; Ma, X. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Ma, Y. M. (Shandong University, Jinan 250100, People’s Republic of China) ; Maas, F. E. (Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Maggiora, M. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Maldaner, S. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Malik, Q. A. (University of the Punjab, Lahore-54590, Pakistan) ; Mangoni, A. (INFN and University of Perugia, I-06100, Perugia, Italy) ; Mao, Y. J. (Peking University, Beijing 100871, People’s Republic of China) ; Mao, Z. P. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Marcello, S. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Meng, Z. X. (University of Jinan, Jinan 250022, People’s Republic of China) ; Messchendorp, J. G. (KVI-CART, University of Groningen, NL-9747 AA Groningen, Netherlands) ; Mezzadri, G. (University of Ferrara, I-44122, Ferrara, Italy) ; Min, J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Mitchell, R. E. (Indiana University, Bloomington, Indiana 47405, USA) ; Mo, X. H. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Mo, Y. J. (Central China Normal University, Wuhan 430079, People’s Republic of China) ; Morales Morales, C. (Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Muchnoi, N. Yu. (G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia) ; Muramatsu, H. (University of Minnesota, Minneapolis, Minnesota 55455, USA) ; Mustafa, A. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Nefedov, Y. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Nerling, F. (GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany) ; Nikolaev, I. B. (G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia) ; Ning, Z. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Nisar, S. (COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan) ; Niu, S. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Niu, X. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Olsen, S. L. (Seoul National University, Seoul, 151-747 Korea) ; Ouyang, Q. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Pacetti, S. (INFN and University of Perugia, I-06100, Perugia, Italy) ; Pan, Y. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Papenbrock, M. (Uppsala University, Box 516, SE-75120 Uppsala, Sweden) ; Patteri, P. (INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy) ; Pelizaeus, M. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Pellegrino, J. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Peng, H. P. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Peng, Z. Y. (Guangxi University, Nanning 530004, People’s Republic of China) ; Peters, K. (GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany) ; Pettersson, J. (Uppsala University, Box 516, SE-75120 Uppsala, Sweden) ; Ping, J. L. (Nanjing Normal University, Nanjing 210023, People’s Republic of China) ; Ping, R. G. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Pitka, A. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Poling, R. (University of Minnesota, Minneapolis, Minnesota 55455, USA) ; Prasad, V. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Qi, H. R. (Beihang University, Beijing 100191, People’s Republic of China) ; Qi, M. (Nanjing University, Nanjing 210093, People’s Republic of China) ; Qi, T. Y. (Beihang University, Beijing 100191, People’s Republic of China) ; Qian, S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Qiao, C. F. (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Qin, N. (Wuhan University, Wuhan 430072, People’s Republic of China) ; Qin, X. S. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Qin, Z. H. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Qiu, J. F. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Qu, S. Q. (Nankai University, Tianjin 300071, People’s Republic of China) ; Rashid, K. H. (University of the Punjab, Lahore-54590, Pakistan) ; Redmer, C. F. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Richter, M. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Ripka, M. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Rivetti, A. (INFN, I-10125, Turin, Italy) ; Rolo, M. (INFN, I-10125, Turin, Italy) ; Rong, G. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Rosner, Ch. (Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Sarantsev, A. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Savrié, M. (University of Ferrara, I-44122, Ferrara, Italy) ; Schoenning, K. (Uppsala University, Box 516, SE-75120 Uppsala, Sweden) ; Shan, W. (Hunan Normal University, Changsha 410081, People’s Republic of China) ; Shan, X. Y. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Shao, M. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Shen, C. P. (Beihang University, Beijing 100191, People’s Republic of China) ; Shen, P. X. (Nankai University, Tianjin 300071, People’s Republic of China) ; Shen, X. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Sheng, H. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Shi, X. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Song, J. J. (Shandong University, Jinan 250100, People’s Republic of China) ; Song, W. M. (Shandong University, Jinan 250100, People’s Republic of China) ; Song, X. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Sosio, S. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Sowa, C. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Spataro, S. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Sun, G. X. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Sun, J. F. (Henan Normal University, Xinxiang 453007, People’s Republic of China) ; Sun, L. (Wuhan University, Wuhan 430072, People’s Republic of China) ; Sun, S. S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Sun, X. H. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Sun, Y. J. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Sun, Y. K. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Sun, Y. Z. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Sun, Z. J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Sun, Z. T. (Indiana University, Bloomington, Indiana 47405, USA) ; Tan, Y. T. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Tang, C. J. (Sichuan University, Chengdu 610064, People’s Republic of China) ; Tang, G. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Tang, X. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Tapan, I. (Uludag University, 16059 Bursa, Turkey) ; Tiemens, M. (KVI-CART, University of Groningen, NL-9747 AA Groningen, Netherlands) ; Tsednee, B. (Institute of Physics and Technology, Peace Ave. 54B, Ulaanbaatar 13330, Mongolia) ; Uman, I. (Near East University, Nicosia, North Cyprus, Mersin 10, Turkey) ; Wang, B. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Wang, B. L. (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Wang, D. (Peking University, Beijing 100871, People’s Republic of China) ; Wang, D. Y. (Peking University, Beijing 100871, People’s Republic of China) ; Wang, Dan (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Wang, K. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Wang, L. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Wang, L. S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Wang, M. (Shandong University, Jinan 250100, People’s Republic of China) ; Wang, Meng (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Wang, P. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Wang, P. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Wang, W. P. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Wang, X. F. (Tsinghua University, Beijing 100084, People’s Republic of China) ; Wang, X. L. (Fudan University, Shanghai 200443, People’s Republic of China) ; Wang, Y. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Wang, Y. F. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Wang, Z. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Wang, Z. G. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Wang, Z. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Wang, Zongyuan (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Weber, T. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Wei, D. H. (Guangxi Normal University, Guilin 541004, People’s Republic of China) ; Weidenkaff, P. (Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; Wen, S. P. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Wiedner, U. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Wolke, M. (Uppsala University, Box 516, SE-75120 Uppsala, Sweden) ; Wu, L. H. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Wu, L. J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Wu, Z. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Xia, L. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Xia, Y. (Hunan University, Changsha 410082, People’s Republic of China) ; Xiao, D. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Xiao, Y. J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Xiao, Z. J. (Nanjing Normal University, Nanjing 210023, People’s Republic of China) ; Xie, Y. G. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Xie, Y. H. (Central China Normal University, Wuhan 430079, People’s Republic of China) ; Xiong, X. A. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Xiu, Q. L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Xu, G. F. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Xu, J. J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Xu, L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Xu, Q. J. (Hangzhou Normal University, Hangzhou 310036, People’s Republic of China) ; Xu, Q. N. (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Xu, X. P. (Soochow University, Suzhou 215006, People’s Republic of China) ; Yan, F. (University of South China, Hengyang 421001, People’s Republic of China) ; Yan, L. (University of Turin, I-10125, Turin, Italy) (INFN, I-10125, Turin, Italy) ; Yan, W. B. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Yan, W. C. (Beihang University, Beijing 100191, People’s Republic of China) ; Yan, Y. H. (Hunan University, Changsha 410082, People’s Republic of China) ; Yang, H. J. (Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China) ; Yang, H. X. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Yang, L. (Wuhan University, Wuhan 430072, People’s Republic of China) ; Yang, R. X. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Yang, Y. H. (Nanjing University, Nanjing 210093, People’s Republic of China) ; Yang, Y. X. (Guangxi Normal University, Guilin 541004, People’s Republic of China) ; Yang, Yifan (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Yang, Z. Q. (Hunan University, Changsha 410082, People’s Republic of China) ; Ye, M. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Ye, M. H. (China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China) ; Yin, J. H. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; You, Z. Y. (Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China) ; Yu, B. X. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Yu, C. X. (Nankai University, Tianjin 300071, People’s Republic of China) ; Yu, J. S. (Hunan University, Changsha 410082, People’s Republic of China) ; Yu, J. S. (Lanzhou University, Lanzhou 730000, People’s Republic of China) ; Yuan, C. Z. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Yuan, Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Yuncu, A. (Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey) ; Zafar, A. A. (University of the Punjab, Lahore-54590, Pakistan) ; Zeng, Y. (Hunan University, Changsha 410082, People’s Republic of China) ; Zhang, B. X. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhang, B. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhang, C. C. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhang, D. H. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhang, H. H. (Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China) ; Zhang, H. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhang, J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhang, J. L. (Xinyang Normal University, Xinyang 464000, People’s Republic of China) ; Zhang, J. Q. (Bochum Ruhr-University, D-44780 Bochum, Germany) ; Zhang, J. W. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhang, J. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhang, J. Z. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhang, K. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhang, L. (Tsinghua University, Beijing 100084, People’s Republic of China) ; Zhang, T. J. (Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China) ; Zhang, X. Y. (Shandong University, Jinan 250100, People’s Republic of China) ; Zhang, Y. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhang, Y. H. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhang, Y. T. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhang, Yang (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhang, Yao (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhang, Yi (Fudan University, Shanghai 200443, People’s Republic of China) ; Zhang, Yu (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhang, Z. H. (Central China Normal University, Wuhan 430079, People’s Republic of China) ; Zhang, Z. P. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) ; Zhang, Z. Y. (Wuhan University, Wuhan 430072, People’s Republic of China) ; Zhao, G. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhao, J. W. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhao, J. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhao, J. Z. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhao, Lei (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhao, Ling (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhao, M. G. (Nankai University, Tianjin 300071, People’s Republic of China) ; Zhao, Q. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhao, S. J. (Zhengzhou University, Zhengzhou 450001, People’s Republic of China) ; Zhao, T. C. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhao, Y. B. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhao, Z. G. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhemchugov, A. (Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia) ; Zheng, B. (University of South China, Hengyang 421001, People’s Republic of China) ; Zheng, J. P. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zheng, Y. H. (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhong, B. (Nanjing Normal University, Nanjing 210023, People’s Republic of China) ; Zhou, L. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhou, Q. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhou, X. (Wuhan University, Wuhan 430072, People’s Republic of China) ; Zhou, X. K. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhou, X. R. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhou, X. Y. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhou, Xiaoyu (Hunan University, Changsha 410082, People’s Republic of China) ; Zhou, Xu (Hunan University, Changsha 410082, People’s Republic of China) ; Zhu, A. N. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhu, J. (Nankai University, Tianjin 300071, People’s Republic of China) ; Zhu, J. (Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China) ; Zhu, K. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhu, K. J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhu, S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zhu, S. H. (University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China) ; Zhu, X. L. (Tsinghua University, Beijing 100084, People’s Republic of China) ; Zhu, Y. C. (University of Science and Technology of China, Hefei 230026, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zhu, Y. S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhu, Z. A. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China) ; Zhuang, J. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) (State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China) ; Zou, B. S. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; Zou, J. H. (Institute of High Energy Physics, Beijing 100049, People’s Republic of China)

18 June 2019

Abstract: We report the observation and study of the decay J/ψϕηη using 1.3×109 J/ψ events collected with the BESIII detector. Its branching fraction, including all possible intermediate states, is measured to be (2.32±0.06±0.16)×104. We also report evidence for a structure, denoted as X, in the ϕη mass spectrum in the 2.02.1 GeV/c2 region. Using two decay modes of the η meson (γπ+π and ηπ+π), a simultaneous fit to the ϕη mass spectra is performed. Assuming the quantum numbers of the X to be JP=1, its significance is found to be 4.4σ, with a mass and width of (2002.1±27.5±21.4) MeV/c2 and (129±17±9) MeV, respectively, and a product branching fraction B(J/ψηX)×B(Xϕη)=(9.8±1.2±1.7)×105. Alternatively, assuming JP=1+, the significance is 3.8σ, with a mass and width of (2062.8±13.1±7.2) MeV/c2 and (177±36±35) MeV, respectively, and a product branching fraction B(J/ψηX)×B(Xϕη)=(9.6±1.4±2.0)×105. The angular distribution of J/ψηX is studied and the two JP assumptions of the X cannot be clearly distinguished due to the limited statistics. In all measurements the first uncertainties are statistical and the second systematic.


Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.112008
License: CC-BY-4.0



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