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Evidence for e+e− →γχc1,2 at center-of-mass energies from 4.009 to 4.360 GeV*
M. Ablikim (麦迪娜)1, M. N. Achasov8,58, X. C. Ai (艾小聪)1, O. Albayrak4, M. Albrecht3, D. J. Ambrose47, A. Amoroso51,53, F. F. An (安芬芬)1, Q. An (安琪)48, J. Z. Bai (白景芝)1, R. Baldini Ferroli19, Y. Ban (班勇)32, D. W. Bennett18, J. V. Bennett4, M. Bertani19, D. Bettoni21, J. M. Bian (边渐鸣)46, F. Bianchi51,53, E. Boger24,65, O. Bondarenko26, I. Boyko24, R. A. Briere4, H. Cai (蔡浩)55, X. Cai (蔡啸)1, O. Cakir41,59, A. Calcaterra19, G. F. Cao (曹国富)1, S. A. Cetin42, J. F. Chang (常劲帆)1, G. Chelkov24,60, G. Chen (陈刚)1, H. S. Chen (陈和生)1, H. Y. Chen (陈海云)2, J. C. Chen (陈江川)1, M. L. Chen (陈玛丽)1, S. J. Chen (陈申见)30, X. Chen (谌炫)1, X. R. Chen (陈旭荣)27, Y. B. Chen (陈元柏)1, H. P. Cheng (程和平)16, X. K. Chu (褚新坤)32, G. Cibinetto21, D. Cronin-Hennessy46, H. L. Dai (代洪亮)1, J. P. Dai (代建平)35, A. Dbeyssi13, D. Dedovich24, Z. Y. Deng (邓子艳)1, A. Denig23, I. Denysenko24, M. Destefanis51,53, F. De Mori51,53, Y. Ding (丁勇)28, C. Dong (董超)31, J. Dong (董静)1, L. Y. Dong (董燎原)1, M. Y. Dong (董明义)1, S. X. Du (杜书先)57, P. F. Duan (段鹏飞)1, J. Z. Fan (范荆州)40, J. Fang (方建)1, S. S. Fang (房双世)1, X. Fang (方馨)48, Y. Fang (方易)1, L. Fava52,53, F. Feldbauer23, G. Felici19, C. Q. Feng (封常青)48, E. Fioravanti21, M. Fritsch13,23, C. D. Fu (傅成栋)1, Q. Gao (高清)1, Y. Gao (高原宁)40, Z. Gao (高榛)48, I. Garzia21, K. Goetzen9, W. X. Gong (龚文煊)1, W. Gradl23, M. Greco51,53, M. H. Gu (顾旻皓)1, Y. T. Gu (顾运厅)11, Y. H. Guan (管颖慧)1, A. Q. Guo (郭爱强)1, L. B. Guo (郭立波)29, T. Guo (郭暾)29, Y. Guo (郭玥)1, Y. P. Guo23, Z. Haddadi26, A. Hafner23, S. Han (韩爽)55, Y. L. Han (韩艳良)1, F. A. Harris45, K. L. He (何康林)1, Z. Y. He (何振亚)31, T. Held3, Y. K. Heng (衡月昆)1, Z. L. Hou (侯治龙)1, C. Hu (胡琛)29, H. M. Hu (胡海明)1, J. F. Hu (胡继峰)51, T. Hu (胡涛)1, Y. Hu (胡誉)1, G. M. Huang (黄光明)5, G. S. Huang (黄光顺)48, H. P. Huang (黄海鹏)55, J. S. Huang (黄金书)14, X. T. Huang (黄性涛)34, Y. Huang (黄勇)30, T. Hussain50, Q. Ji (纪全)1, Q. P. Ji (姬清平)31, X. B. Ji (季晓斌)1, X. L. Ji (季筱璐)1, L. L. Jiang (姜丽丽)1, L. W. Jiang (姜鲁文)55, X. S. Jiang (江晓山)1, J. B. Jiao (焦健斌)34, Z. Jiao (焦铮)16, D. P. Jin (金大鹏)1, S. Jin (金山)1, T. Johansson54, A. Julin46, N. Kalantar-Nayestanaki26, X. L. Kang (康晓琳)1, X. S. Kang (康晓珅)31, M. Kavatsyuk26, B. C. Ke4, R. Kliemt13, B. Kloss23, O. B. Kolcu42,61, B. Kopf3, M. Kornicer45, W. Kuehn25, A. Kupsc54, W. Lai (赖蔚)1, J. S. Lange25, M. Lara18, P. Larin13, C. H. Li (李春花)1, Cheng Li (李澄)48, D. M. Li (李德民)57, F. Li (李飞)1, G. Li (李刚)1, H. B. Li (李海波)1, J. C. Li (李家才)1, Jin Li (李瑾)33, K. Li (李康)12, K. Li (李科)34, P. R. Li (李培荣)44, T. Li (李腾)34, W. D. Li (李卫东)1, W. G. Li (李卫国)1, X. L. Li (李晓玲)34, X. M. Li (李小梅)11, X. N. Li (李小男)1, X. Q. Li (李学潜)31, Z. B. Li (李志兵)39, H. Liang (梁昊)48, Y. F. Liang (梁勇飞)37, Y. T. Liang (梁羽铁)25, G. R. Liao (廖广睿)10, D. X. Lin(Lin)13, B. J. Liu (刘北江)1, C. L. Liu4, C. X. Liu (刘春秀)1, F. H. Liu (刘福虎)36, Fang Liu (刘芳)1, Feng Liu (刘峰)5, H. B. Liu (刘宏邦)11, H. H. Liu (刘汇慧)15, H. H. Liu (刘欢欢)1, H. M. Liu (刘怀民)1, J. Liu (刘杰)1, J. P. Liu (刘觉平)55, J. Y. Liu (刘晶译)1, K. Liu (刘凯)40, K. Y. Liu (刘魁勇)28, L. D. Liu (刘兰雕)32, P. L. Liu (刘佩莲)1, Q. Liu (刘倩)44, S. B. Liu (刘树彬)48, X. Liu (刘翔)27, X. X. Liu (刘晓霞)44, Y. B. Liu (刘玉斌)31, Z. A. Liu (刘振安)1, Zhiqiang Liu (刘志强)1, Zhiqing Liu23, H. Loehner26, X. C. Lou (娄辛丑)1,62, H. J. Lu (吕海江)16, J. G. Lu (吕军光)1, R. Q. Lu (鲁睿其)17, Y. Lu (卢宇)1, Y. P. Lu (卢云鹏)1, C. L. Luo (罗成林)29, M. X. Luo (罗民兴)56, T. Luo45, X. L. Luo (罗小兰)1, M. Lv (吕蒙)1, X. R. Lyu (吕晓睿)44, F. C. Ma (马凤才)28, H. L. Ma (马海龙)1, L. L. Ma (马连良)34, Q. M. Ma (马秋梅)1, S. Ma (马斯)1, T. Ma (马天)1, X. N. Ma (马旭宁)31, X. Y. Ma (马骁妍)1, F. E. Maas13, M. Maggiora51,53, Q. A. Malik50, Y. J. Mao (冒亚军)32, Z. P. Mao (毛泽普)1, S. Marcello51,53, J. G. Messchendorp26, J. Min (闵建)1, T. J. Min (闵天觉)1, R. E. Mitchell18, X. H. Mo (莫晓虎)1, Y. J. Mo (莫玉俊)5, C. Morales Morales13, K. Moriya18, N. Yu. Muchnoi8,58, H. Muramatsu46, Y. Nefedov24, F. Nerling13, I. B. Nikolaev8,58, Z. Ning (宁哲)1, S. Nisar7, S. L. Niu (牛顺利)1, X. Y. Niu (牛讯伊)1, S. L. Olsen (馬鵬)33, Q. Ouyang (欧阳群)1, S. Pacetti20, P. Patteri19, M. Pelizaeus3, H. P. Peng (彭海平)48, K. Peters9, J. L. Ping (平加伦)29, R. G. Ping (平荣刚)1, R. Poling46, Y. N. Pu (濮亚男)17, M. Qi (祁鸣)30, S. Qian (钱森)1, C. F. Qiao (乔从丰)44, L. Q. Qin (秦丽清)34, N. Qin (覃拈)55, X. S. Qin (秦小帅)1, Y. Qin (秦瑶)32, Z. H. Qin (秦中华)1, J. F. Qiu (邱进发)1, K. H. Rashid50, C. F. Redmer23, H. L. Ren (任海龙)17, M. Ripka23, G. Rong (荣刚)1, X. D. Ruan (阮向东)11, V. Santoro21, A. Sarantsev24,63, M. Savrié22, K. Schoenning54, S. Schumann23, W. Shan (单葳)32, M. Shao (邵明)48, C. P. Shen (沈成平)2, P. X. Shen (沈培迅)31, X. Y. Shen (沈肖雁)1, H. Y. Sheng (盛华义)1, M. R. Shepherd18, W. M. Song (宋维民)1, X. Y. Song (宋欣颖)1, S. Sosio51,53, S. Spataro51,53, B. Spruck25, G. X. Sun (孙功星)1, J. F. Sun (孙俊峰)14, S. S. Sun (孙胜森)1, Y. J. Sun (孙勇杰)48, Y. Z. Sun (孙永昭)1, Z. J. Sun (孙志嘉)1, Z. T. Sun (孙振田)18, C. J. Tang (唐昌建)37, X. Tang (唐晓)1, I. Tapan43, E. H. Thorndike47, M. Tiemens26, D. Toth46, M. Ullrich25, I. Uman42, G. S. Varner45, B. Wang (王斌)31, B. L. Wang (王滨龙)44, D. Wang (王东)32, D. Y. Wang (王大勇)32, K. Wang (王科)1, L. L. Wang (王亮亮)1, L. S. Wang (王灵淑)1, M. Wang (王萌)34, P. Wang (王平)1, P. L. Wang (王佩良)1, Q. J. Wang (王庆娟)1, S. G. Wang (王思广)32, W. Wang (王炜)1, X. F. Wang (王雄飞)40, Y. D. Wang(Yadi)19, Y. F. Wang (王贻芳)1, Y. Q. Wang (王亚乾)23, Z. Wang (王铮)1, Z. G. Wang (王志刚)1, Z. H. Wang (王志宏)48, Z. Y. Wang (王至勇)1, T. Weber23, D. H. Wei (魏代会)10, J. B. Wei (韦江波)32, P. Weidenkaff23, S. P. Wen (文硕频)1, U. Wiedner3, M. Wolke54, L. H. Wu (伍灵慧)1, Z. Wu (吴智)1, L. G. Xia (夏力钢)40, Y. Xia (夏宇)17, D. Xiao (肖栋)1, Z. J. Xiao (肖振军)29, Y. G. Xie (谢宇广)1, G. F. Xu (许国发)1, L. Xu (徐雷)1, Q. J. Xu (徐庆君)12, Q. N. Xu (徐庆年)44, X. P. Xu (徐新平)38, L. Yan (严亮)48, W. B. Yan (鄢文标)48, W. C. Yan (闫文成)48, Y. H. Yan (颜永红)17, H. X. Yang (杨洪勋)1, L. Yang (杨柳)55, Y. Yang (杨迎)5, Y. X. Yang (杨永栩)10, H. Ye (叶桦)1, M. Ye (叶梅)1, M. H. Ye (叶铭汉)6, J. H. Yin (殷俊昊)1, B. X. Yu (俞伯祥)1, C. X. Yu (喻纯旭)31, H. W. Yu (于海旺)32, J. S. Yu (俞洁晟)27, C. Z. Yuan (苑长征)1, W. L. Yuan (袁文龙)30, Y. Yuan (袁野)1, A. Yuncu42,64, A. A. Zafar50, A. Zallo19, Y. Zeng (曾云)17, B. X. Zhang (张丙新)1, B. Y. Zhang (张炳云)1, C. Zhang (张驰)30, C. C. Zhang (张长春)1, D. H. Zhang (张达华)1, H. H. Zhang (张宏浩)39, H. Y. Zhang (章红宇)1, J. J. Zhang (张佳佳)1, J. L. Zhang (张杰磊)1, J. Q. Zhang (张敬庆)1, J. W. Zhang (张家文)1, J. Y. Zhang (张建勇)1, J. Z. Zhang (张景芝)1, K. Zhang (张坤)1, L. Zhang (张磊)1, S. H. Zhang (张书华)1, X. Y. Zhang (张学尧)34, Y. Zhang (张瑶)1, Y. H. Zhang (张银鸿)1, Y. T. Zhang (张亚腾)48, Z. H. Zhang (张正好)5, Z. P. Zhang (张子平)48, Z. Y. Zhang (张振宇)55, G. Zhao (赵光)1, J. W. Zhao (赵京伟)1, J. Y. Zhao (赵静宜)1, J. Z. Zhao (赵京周)1, Lei Zhao (赵雷)48, Ling Zhao (赵玲)1, M. G. Zhao (赵明刚)31, Q. Zhao (赵强)1, Q. W. Zhao (赵庆旺)1, S. J. Zhao (赵书俊)57, T. C. Zhao (赵天池)1, Y. B. Zhao (赵豫斌)1, Z. G. Zhao (赵政国)48, A. Zhemchugov24,65, B. Zheng (郑波)49, J. P. Zheng (郑建平)1, W. J. Zheng (郑文静)34, Y. H. Zheng (郑阳恒)44, B. Zhong (钟彬)29, L. Zhou (周莉)1, Li Zhou (周立)31, X. Zhou (周详)55, X. K. Zhou (周晓康)48, X. R. Zhou (周小蓉)48, X. Y. Zhou (周兴玉)1, K. Zhu (朱凯)1, K. J. Zhu (朱科军)1, S. Zhu (朱帅)1, X. L. Zhu (朱相雷)40, Y. C. Zhu (朱莹春)48, Y. S. Zhu (朱永生)1, Z. A. Zhu (朱自安)1, J. Zhuang (庄建)1, B. S. Zou (邹冰松)1, J. H. Zou (邹佳恒)1 and ( BESIII collaboration )
1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2 Beihang University, Beijing 100191, China
3 Bochum Ruhr-University, D-44780 Bochum, Germany
4 Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
5 Central China Normal University, Wuhan 430079, China
6 China Center of Advanced Science and Technology, Beijing 100190, China
7 COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
8 G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
9 GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
10 Guangxi Normal University, Guilin 541004, China
11 Guangxi University, Nanning 530004, China
12 Hangzhou Normal University, Hangzhou 310036, China
13 Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
14 Henan Normal University, Xinxiang 453007, China
15 Henan University of Science and Technology, Luoyang 471003, China
16 Huangshan College, Huangshan 245000, China
17 Hunan University, Changsha 410082, China
18 Indiana University, Bloomington, Indiana 47405, USA
19 INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy
20 INFN and University of Perugia, I-06100, Perugia, Italy
21 INFN Sezione di Ferrara, I-44122, Ferrara, Italy
22 University of Ferrara, I-44122, Ferrara, Italy
23 Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
24 Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
25 Justus Liebig University Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
26 KVI-CART, University of Groningen, NL-9747 AA Groningen, The Netherlands
27 Lanzhou University, Lanzhou 730000, China
28 Liaoning University, Shenyang 110036, China
29 Nanjing Normal University, Nanjing 210023, China
30 Nanjing University, Nanjing 210093, China
31 Nankai University, Tianjin 300071, China
32 Peking University, Beijing 100871, China
33 Seoul National University, Seoul, 151-747 Korea
34 Shandong University, Jinan 250100, China
35 Shanghai Jiao Tong University, Shanghai 200240, China
36 Shanxi University, Taiyuan 030006, China
37 Sichuan University, Chengdu 610064, China
38 Soochow University, Suzhou 215006, China
39 Sun Yat-Sen University, Guangzhou 510275, China
40 Tsinghua University, Beijing 100084, China
41 Istanbul Aydin University, 34295 Sefakoy, Istanbul, Turkey
42 Dogus University, 34722 Istanbul, Turkey
43 Uludag University, 16059 Bursa, Turkey
44 University of Chinese Academy of Sciences, Beijing 100049, China
45 University of Hawaii, Honolulu, Hawaii 96822, USA
46 University of Minnesota, Minneapolis, Minnesota 55455, USA
47 University of Rochester, Rochester, New York 14627, USA
48 University of Science and Technology of China, Hefei 230026, China
49 University of South China, Hengyang 421001, China
50 University of the Punjab, Lahore-54590, Pakistan
51 University of Turin, I-10125, Turin, Italy
52 University of Eastern Piedmont, I-15121, Alessandria, Italy
53 INFN, I-10125, Turin, Italy
54 Uppsala University, Box 516, SE-75120 Uppsala, Sweden
55 Wuhan University, Wuhan 430072, China
56 Zhejiang University, Hangzhou 310027, China
57 Zhengzhou University, Zhengzhou 450001, China
58 Also at the Novosibirsk State University, Novosibirsk, 630090, Russia
59 Also at Ankara University, 06100 Tandogan, Ankara, Turkey
60 Also at the Moscow Institute of Physics and Technology, Moscow 141700, Russia and at the Functional Electronics Laboratory, Tomsk State University, Tomsk, 634050, Russia
61 Currently at Istanbul Arel University, Kucukcekmece, Istanbul, Turkey
62 Also at University of Texas at Dallas, Richardson, Texas 75083, USA
63 Also at the PNPI, Gatchina 188300, Russia
64 Also at Bogazici University, 34342 Istanbul, Turkey
65 Also at the Moscow Institute of Physics and Technology, Moscow 141700, Russia
Using data samples collected at center-of-mass energies of , 4.230, 4.260, and 4.360 GeV with the BESIII detector operating at the BEPCII collider, we perform a search for the process e+e− → γχcJ (J=0, 1, 2) and find evidence for e+e− → γχc1 and e+e− → γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e− → γχcJ), as well as their upper limits at the 90% confidence level (C.L.) are determined at each center-of-mass energy.
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd
Footnotes
*
Supported by National Key Basic Research Program of China (2015CB856700), Joint Funds of National Natural Science Foundation of China (11079008, 11179007, U1232201, U1332201, U1232107), National Natural Science Foundation of China (NSFC) (10935007, 11121092, 11125525, 11235011, 11322544, 11335008), Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program, CAS (KJCX2-YW-N29, KJCX2-YW-N45), 100 Talents Program of CAS, INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG (Collaborative Research Center CRC-1044), Istituto Nazionale di Fisica Nucleare, Italy, Ministry of Development of Turkey (DPT2006K-120470), Russian Foundation for Basic Research (14-07-91152), U. S. Department of Energy (DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118), U.S. National Science Foundation, University of Groningen (RuG) and Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt, WCU Program of National Research Foundation of Korea (R32-2008-000-10155-0)
, 4.230, 4.260, and 4.360 GeV with the BESIII detector operating at the BEPCII collider, we perform a search for the process e+e− → γχcJ (J=0, 1, 2) and find evidence for e+e− → γχc1 and e+e− → γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e− → γχcJ), as well as their upper limits at the 90% confidence level (C.L.) are determined at each center-of-mass energy.