Observation of a Charged Charmoniumlike Structure in e+e- → (D* (D)over-bar*)±π∓ at √s=4.26 GeV

被引：251
作者：
Ablikim, M. [1 ]
Achasov, M. N. [7 ,54 ]
Albayrak, O. [4 ]
Ambrose, D. J. [44 ]
An, F. F. [1 ]
An, Q. [45 ]
Bai, J. Z. [1 ]
Ferroli, R. Baldini [18 ]
Ban, Y. [29 ]
Becker, J. [3 ]
Bennett, J. V. [17 ]
Bertani, M. [18 ]
Bian, J. M. [43 ]
Boger, E. [22 ,55 ]
Bondarenko, O. [23 ]
Boyko, I. [22 ]
Braun, S. [40 ]
Briere, R. A. [4 ]
Bytev, V. [22 ]
Cai, H. [51 ]
Cai, X. [1 ]
Cakir, O. [37 ]
Calcaterra, A. [18 ]
Cao, G. F. [1 ]
Cetin, S. A. [38 ]
Chang, J. F. [1 ]
Chelkov, G. [22 ,55 ]
Chen, G. [1 ]
Chen, H. S. [1 ]
Chen, J. C. [1 ]
Chen, M. L. [1 ]
Chen, S. J. [27 ]
Chen, X. R. [24 ]
Chen, Y. B. [1 ]
Cheng, H. P. [15 ]
Chu, Y. P. [1 ]
Cronin-Hennessy, D. [43 ]
Dai, H. L. [1 ]
Dai, J. P. [1 ]
Dedovich, D. [22 ]
Deng, Z. Y. [1 ]
Denig, A. [21 ]
Denysenko, I. [22 ]
Destefanis, M. [48 ,50 ]
Ding, W. M. [31 ]
Ding, Y. [25 ]
Dong, L. Y. [1 ]
Dong, M. Y. [1 ]
Du, S. X. [53 ]
Fang, J. [1 ]
机构：
[1] Inst High Energy Phys, Beijing 100049, Peoples R China
[2] Beihang Univ, Beijing 100191, Peoples R China
[3] Ruhr Univ Bochum, D-44780 Bochum, Germany
[4] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA
[5] Cent China Normal Univ, Wuhan 430079, Peoples R China
[6] China Ctr Adv Sci & Technol, Beijing 100190, Peoples R China
[7] SB RAS BINP, GI Budker Inst Nucl Phys, Novosibirsk 630090, Russia
[8] GSI Helmholtzctr Heavy Ion Res GmbH, D-64291 Darmstadt, Germany
[9] Guangxi Normal Univ, Guilin 541004, Peoples R China
[10] Guangxi Univ, Nanning 530004, Peoples R China
[11] Hangzhou Normal Univ, Hangzhou 310036, Zhejiang, Peoples R China
[12] Helmholtz Inst Mainz, D-55099 Mainz, Germany
[13] Henan Normal Univ, Xinxiang 453007, Peoples R China
[14] Henan Univ Sci & Technol, Luoyang 471003, Peoples R China
[15] Huangshan Coll, Huangshan 245000, Peoples R China
[16] Hunan Univ, Changsha 410082, Hunan, Peoples R China
[17] Indiana Univ, Bloomington, IN 47405 USA
[18] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[19] Ist Nazl Fis Nucl, I-06100 Perugia, Italy
[20] Univ Perugia, I-06100 Perugia, Italy
[21] Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany
[22] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia
[23] Univ Groningen, KVI, NL-9747 AA Groningen, Netherlands
[24] Lanzhou Univ, Lanzhou 730000, Peoples R China
[25] Liaoning Univ, Shenyang 110036, Peoples R China
[26] Nanjing Normal Univ, Nanjing 210023, Jiangsu, Peoples R China
[27] Nanjing Univ, Nanjing 210093, Jiangsu, Peoples R China
[28] Nankai Univ, Tianjin 300071, Peoples R China
[29] Peking Univ, Beijing 100871, Peoples R China
[30] Seoul Natl Univ, Seoul 151747, South Korea
[31] Shandong Univ, Jinan 250100, Peoples R China
[32] Shanxi Univ, Taiyuan 030006, Peoples R China
[33] Sichuan Univ, Chengdu 610064, Peoples R China
[34] Soochow Univ, Suzhou 215006, Peoples R China
[35] Sun Yat Sen Univ, Guangzhou 510275, Guangdong, Peoples R China
[36] Tsinghua Univ, Beijing 100084, Peoples R China
[37] Ankara Univ, TR-06100 Ankara, Turkey
[38] Dogus Univ, TR-34722 Istanbul, Turkey
[39] Uludag Univ, TR-16059 Bursa, Turkey
[40] Univ Giessen, D-35392 Giessen, Germany
[41] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[42] Univ Hawaii, Honolulu, HI 96822 USA
[43] Univ Minnesota, Minneapolis, MN 55455 USA
[44] Univ Rochester, Rochester, NY 14627 USA
[45] Univ Sci & Technol China, Hefei 230026, Peoples R China
[46] Univ South China, Hengyang 421001, Peoples R China
[47] Univ Punjab, Lahore 54590, Pakistan
[48] Univ Turin, I-10125 Turin, Italy
[49] Univ Piemonte Orientale, I-15121 Alessandria, Italy
[50] Ist Nazl Fis Nucl, I-10125 Turin, Italy
来源：
PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 13期
基金：
中国国家自然科学基金; 新加坡国家研究基金会; 美国国家科学基金会;
关键词：
All Open Access; Green;
D O I：
10.1103/PhysRevLett.112.132001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the process e(+)e(-) -> (D* (D) over bar*)(+/-)pi(-/+) at a center-of-mass energy of 4.26 GeV using a 827 pb(-1) data sample obtained with the BESIII detector at the Beijing Electron Positron Collider. Based on a partial reconstruction technique, the Born cross section is measured to be (137 +/- 9 +/- 15) pb. We observe a structure near the (D* (D) over bar*)(+/-) threshold in the pi(-/+) recoil mass spectrum, which we denote as the Z(c)(+/-) (4025). The measured mass and width of the structure are (4026.3 +/- 2.6 +/- 3.7) MeV/c(2) and (24.8 +/- 5.6 +/- 7.7) MeV, respectively. Its production ratio sigma(e(+)e(-) -> Z(c)(+/-)(4025)pi(-/+)-> (D* (D) over bar*)(+/-)pi(-/+)/sigma(e(+)e(-) -> (D* (D) over bar*)(+/-)pi(-/+) is determined to be 0.65 +/- 0.09 +/- 0.06. The first uncertainties are statistical and the second are systematic.
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