Observation of e+e- → γX(3872) at BESIII

M Ablikim; M N Achasov; X C Ai; O Albayrak; D J Ambrose; F F An; Q An; J Z Bai; R Baldini Ferroli; Y Ban; J V Bennett; M Bertani; J M Bian; E Boger; O Bondarenko; I Boyko; S Braun; R A Briere; H Cai; X Cai; O Cakir; A Calcaterra; G F Cao; S A Cetin; J F Chang; G Chelkov; G Chen; H S Chen; J C Chen; M L Chen; S J Chen; X Chen; X R Chen; Y B Chen; H P Cheng; X K Chu; Y P Chu; D Cronin-Hennessy; H L Dai; J P Dai; D Dedovich; Z Y Deng; A Denig; I Denysenko; M Destefanis; W M Ding; Y Ding; C Dong; J Dong; L Y Dong; M Y Dong; S X Du; J Z Fan; J Fang; S S Fang; Y Fang; L Fava; C Q Feng; C D Fu; J L Fu; O Fuks; Q Gao; Y Gao; C Geng; K Goetzen; W X Gong; W Gradl; M Greco; M H Gu; Y T Gu; Y H Guan; A Q Guo; L B Guo; T Guo; Y P Guo; Y L Han; F A Harris; K L He; M He; Z Y He; T Held; Y K Heng; Z L Hou; C Hu; H M Hu; J F Hu; T Hu; G M Huang; G S Huang; J S Huang; L Huang; X T Huang; Y Huang; T Hussain; C S Ji; Q Ji; Q P Ji; X B Ji; X L Ji; L L Jiang; X S Jiang; J B Jiao; Z Jiao; D P Jin; S Jin; T Johansson; N Kalantar-Nayestanaki; X L Kang; X S Kang; M Kavatsyuk; B Kloss; B Kopf; M Kornicer; W Kuehn; A Kupsc; W Lai; J S Lange; M Lara; P Larin; M Leyhe; C H Li; Cheng Li; Cui Li; D Li; D M Li; F Li; G Li; H B Li; J C Li; K Li; K Li; Lei Li; P R Li; Q J Li; T Li; W D Li; W G Li; X L Li; X N Li; X Q Li; X R Li; Z B Li; H Liang; Y F Liang; Y T Liang; D X Lin; B J Liu; C L Liu; C X Liu; F H Liu; Fang Liu; Feng Liu; H B Liu; H H Liu; H M Liu; J Liu; J P Liu; K Liu; K Y Liu; P L Liu; Q Liu; S B Liu; X Liu; Y B Liu; Z A Liu; Zhiqiang Liu; Zhiqing Liu; H Loehner; X C Lou; G R Lu; H J Lu; H L Lu; J G Lu; X R Lu; Y Lu; Y P Lu; C L Luo; M X Luo; T Luo; X L Luo; M Lv; F C Ma; H L Ma; Q M Ma; S Ma; T Ma; X Y Ma; F E Maas; M Maggiora; Q A Malik; Y J Mao; Z P Mao; J G Messchendorp; J Min; T J Min; R E Mitchell; X H Mo; Y J Mo; H Moeini; C Morales Morales; K Moriya; N Yu Muchnoi; H Muramatsu; Y Nefedov; I B Nikolaev; Z Ning; S Nisar; X Y Niu; S L Olsen; Q Ouyang; S Pacetti; M Pelizaeus; H P Peng; K Peters; J L Ping; R G Ping; R Poling; E Prencipe; M Qi; S Qian; C F Qiao; L Q Qin; X S Qin; Y Qin; Z H Qin; J F Qiu; K H Rashid; C F Redmer; M Ripka; G Rong; X D Ruan; A Sarantsev; K Schoenning; S Schumann; W Shan; M Shao; C P Shen; X Y Shen; H Y Sheng; M R Shepherd; W M Song; X Y Song; S Spataro; B Spruck; G X Sun; J F Sun; S S Sun; Y J Sun; Y Z Sun; Z J Sun; Z T Sun; C J Tang; X Tang; I Tapan; E H Thorndike; D Toth; M Ullrich; I Uman; G S Varner; B Wang; D Wang; D Y Wang; K Wang; L L Wang; L S Wang; M Wang; P Wang; P L Wang; Q J Wang; S G Wang; W Wang; X F Wang; Y D Wang; Y F Wang; Y Q Wang; Z Wang; Z G Wang; Z H Wang; Z Y Wang; D H Wei; J B Wei; P Weidenkaff; S P Wen; M Werner; U Wiedner; M Wolke; L H Wu; N Wu; Z Wu; L G Xia; Y Xia; D Xiao; Z J Xiao; Y G Xie; Q L Xiu; G F Xu; L Xu; Q J Xu; Q N Xu; X P Xu; Z Xue; L Yan; W B Yan; W C Yan; Y H Yan; H X Yang; Y Yang; Y X Yang; H Ye; M Ye; M H Ye; B X Yu; C X Yu; H W Yu; J S Yu; S P Yu; C Z Yuan; W L Yuan; Y Yuan; A A Zafar; A Zallo; S L Zang; Y Zeng; B X Zhang; B Y Zhang; C Zhang; C B Zhang; C C Zhang; D H Zhang; H H Zhang; H Y Zhang; J J Zhang; J Q Zhang; J W Zhang; J Y Zhang; J Z Zhang; S H Zhang; X J Zhang; X Y Zhang; Y Zhang; Y H Zhang; Z H Zhang; Z P Zhang; Z Y Zhang; G Zhao; J W Zhao; Lei Zhao; Ling Zhao; M G Zhao; Q Zhao; Q W Zhao; S J Zhao; T C Zhao; X H Zhao; Y B Zhao; Z G Zhao; A Zhemchugov; B Zheng; J P Zheng; Y H Zheng; B Zhong; L Zhou; Li Zhou; X Zhou; X K Zhou; X R Zhou; X Y Zhou; K Zhu; K J Zhu; X L Zhu; Y C Zhu; Y S Zhu; Z A Zhu; J Zhuang; B S Zou; J H Zou; BESIII Collaboration

doi:10.1103/PhysRevLett.112.092001

Observation of e+e- → γX(3872) at BESIII

Phys Rev Lett. 2014 Mar 7;112(9):092001. doi: 10.1103/PhysRevLett.112.092001. Epub 2014 Mar 3.

Authors

M Ablikim¹, M N Achasov², X C Ai¹, O Albayrak³, D J Ambrose⁴, F F An¹, Q An⁵, J Z Bai¹, R Baldini Ferroli⁶, Y Ban⁷, J V Bennett⁸, M Bertani⁶, J M Bian⁹, E Boger¹⁰, O Bondarenko¹¹, I Boyko¹⁰, S Braun¹², R A Briere³, H Cai¹³, X Cai¹, O Cakir¹⁴, A Calcaterra⁶, G F Cao¹, S A Cetin¹⁵, J F Chang¹, G Chelkov¹⁰, G Chen¹, H S Chen¹, J C Chen¹, M L Chen¹, S J Chen¹⁶, X Chen¹, X R Chen¹⁷, Y B Chen¹, H P Cheng¹⁸, X K Chu⁷, Y P Chu¹, D Cronin-Hennessy⁹, H L Dai¹, J P Dai¹, D Dedovich¹⁰, Z Y Deng¹, A Denig¹⁹, I Denysenko¹⁰, M Destefanis²⁰, W M Ding²¹, Y Ding²², C Dong²³, J Dong¹, L Y Dong¹, M Y Dong¹, S X Du²⁴, J Z Fan²⁵, J Fang¹, S S Fang¹, Y Fang¹, L Fava²⁶, C Q Feng⁵, C D Fu¹, J L Fu¹⁶, O Fuks¹⁰, Q Gao¹, Y Gao²⁵, C Geng⁵, K Goetzen²⁷, W X Gong¹, W Gradl¹⁹, M Greco²⁰, M H Gu¹, Y T Gu²⁸, Y H Guan¹, A Q Guo²³, L B Guo²⁹, T Guo²⁹, Y P Guo¹⁹, Y L Han¹, F A Harris³⁰, K L He¹, M He¹, Z Y He²³, T Held³¹, Y K Heng¹, Z L Hou¹, C Hu²⁹, H M Hu¹, J F Hu¹², T Hu¹, G M Huang³², G S Huang⁵, J S Huang³³, L Huang¹, X T Huang²¹, Y Huang¹⁶, T Hussain³⁴, C S Ji⁵, Q Ji¹, Q P Ji²³, X B Ji¹, X L Ji¹, L L Jiang¹, X S Jiang¹, J B Jiao²¹, Z Jiao¹⁸, D P Jin¹, S Jin¹, T Johansson³⁵, N Kalantar-Nayestanaki¹¹, X L Kang¹, X S Kang²³, M Kavatsyuk¹¹, B Kloss¹⁹, B Kopf³¹, M Kornicer³⁰, W Kuehn¹², A Kupsc³⁵, W Lai¹, J S Lange¹², M Lara⁸, P Larin³⁶, M Leyhe³¹, C H Li¹, Cheng Li⁵, Cui Li⁵, D Li³⁷, D M Li²⁴, F Li¹, G Li¹, H B Li¹, J C Li¹, K Li²¹, K Li³⁸, Lei Li¹, P R Li³⁹, Q J Li¹, T Li²¹, W D Li¹, W G Li¹, X L Li²¹, X N Li¹, X Q Li²³, X R Li⁴⁰, Z B Li⁴¹, H Liang⁵, Y F Liang⁴², Y T Liang¹², D X Lin³⁶, B J Liu¹, C L Liu³, C X Liu¹, F H Liu⁴³, Fang Liu¹, Feng Liu³², H B Liu²⁸, H H Liu⁴⁴, H M Liu¹, J Liu¹, J P Liu¹³, K Liu²⁵, K Y Liu²², P L Liu²¹, Q Liu³⁹, S B Liu⁵, X Liu¹⁷, Y B Liu²³, Z A Liu¹, Zhiqiang Liu¹, Zhiqing Liu¹⁹, H Loehner¹¹, X C Lou¹, G R Lu³³, H J Lu¹⁸, H L Lu¹, J G Lu¹, X R Lu³⁹, Y Lu¹, Y P Lu¹, C L Luo²⁹, M X Luo⁴⁵, T Luo³⁰, X L Luo¹, M Lv¹, F C Ma²², H L Ma¹, Q M Ma¹, S Ma¹, T Ma¹, X Y Ma¹, F E Maas³⁶, M Maggiora²⁰, Q A Malik³⁴, Y J Mao⁷, Z P Mao¹, J G Messchendorp¹¹, J Min¹, T J Min¹, R E Mitchell⁸, X H Mo¹, Y J Mo³², H Moeini¹¹, C Morales Morales³⁶, K Moriya⁸, N Yu Muchnoi², H Muramatsu⁹, Y Nefedov¹⁰, I B Nikolaev², Z Ning¹, S Nisar⁴⁶, X Y Niu¹, S L Olsen⁴⁰, Q Ouyang¹, S Pacetti⁴⁷, M Pelizaeus³¹, H P Peng⁵, K Peters²⁷, J L Ping²⁹, R G Ping¹, R Poling⁹, E Prencipe¹⁹, M Qi¹⁶, S Qian¹, C F Qiao³⁹, L Q Qin²¹, X S Qin¹, Y Qin⁷, Z H Qin¹, J F Qiu¹, K H Rashid³⁴, C F Redmer¹⁹, M Ripka¹⁹, G Rong¹, X D Ruan²⁸, A Sarantsev¹⁰, K Schoenning³⁵, S Schumann¹⁹, W Shan⁷, M Shao⁵, C P Shen⁴⁸, X Y Shen¹, H Y Sheng¹, M R Shepherd⁸, W M Song¹, X Y Song¹, S Spataro²⁰, B Spruck¹², G X Sun¹, J F Sun³³, S S Sun¹, Y J Sun⁵, Y Z Sun¹, Z J Sun¹, Z T Sun⁵, C J Tang⁴², X Tang¹, I Tapan⁴⁹, E H Thorndike⁴, D Toth⁹, M Ullrich¹², I Uman¹⁵, G S Varner³⁰, B Wang²³, D Wang⁷, D Y Wang⁷, K Wang¹, L L Wang¹, L S Wang¹, M Wang²¹, P Wang¹, P L Wang¹, Q J Wang¹, S G Wang⁷, W Wang¹, X F Wang²⁵, Y D Wang⁶, Y F Wang¹, Y Q Wang¹⁹, Z Wang¹, Z G Wang¹, Z H Wang⁵, Z Y Wang¹, D H Wei⁵⁰, J B Wei⁷, P Weidenkaff¹⁹, S P Wen¹, M Werner¹², U Wiedner³¹, M Wolke³⁵, L H Wu¹, N Wu¹, Z Wu¹, L G Xia²⁵, Y Xia³⁷, D Xiao¹, Z J Xiao²⁹, Y G Xie¹, Q L Xiu¹, G F Xu¹, L Xu¹, Q J Xu³⁸, Q N Xu³⁹, X P Xu⁵¹, Z Xue¹, L Yan⁵, W B Yan⁵, W C Yan⁵, Y H Yan³⁷, H X Yang¹, Y Yang³², Y X Yang⁵⁰, H Ye¹, M Ye¹, M H Ye⁵², B X Yu¹, C X Yu²³, H W Yu⁷, J S Yu¹⁷, S P Yu²¹, C Z Yuan¹, W L Yuan¹⁶, Y Yuan¹, A A Zafar³⁴, A Zallo⁶, S L Zang¹⁶, Y Zeng³⁷, B X Zhang¹, B Y Zhang¹, C Zhang¹⁶, C B Zhang³⁷, C C Zhang¹, D H Zhang¹, H H Zhang⁴¹, H Y Zhang¹, J J Zhang¹, J Q Zhang¹, J W Zhang¹, J Y Zhang¹, J Z Zhang¹, S H Zhang¹, X J Zhang¹, X Y Zhang²¹, Y Zhang¹, Y H Zhang¹, Z H Zhang³², Z P Zhang⁵, Z Y Zhang¹³, G Zhao¹, J W Zhao¹, Lei Zhao⁵, Ling Zhao¹, M G Zhao²³, Q Zhao¹, Q W Zhao¹, S J Zhao²⁴, T C Zhao¹, X H Zhao¹⁶, Y B Zhao¹, Z G Zhao⁵, A Zhemchugov¹⁰, B Zheng⁵³, J P Zheng¹, Y H Zheng³⁹, B Zhong²⁹, L Zhou¹, Li Zhou²³, X Zhou¹³, X K Zhou³⁹, X R Zhou⁵, X Y Zhou¹, K Zhu¹, K J Zhu¹, X L Zhu²⁵, Y C Zhu⁵, Y S Zhu¹, Z A Zhu¹, J Zhuang¹, B S Zou¹, J H Zou¹; BESIII Collaboration

Affiliations

¹ Institute of High Energy Physics, Beijing 100049, People's Republic of China.
² G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
³ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
⁴ University of Rochester, Rochester, New York 14627, USA.
⁵ University of Science and Technology of China, Hefei 230026, People's Republic of China.
⁶ INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
⁷ Peking University, Beijing 100871, People's Republic of China.
⁸ Indiana University, Bloomington, Indiana 47405, USA.
⁹ University of Minnesota, Minneapolis, Minnesota 55455, USA.
¹⁰ Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
¹¹ KVI, University of Groningen, NL-9747 AA Groningen, The Netherlands.
¹² Universitaet Giessen, D-35392 Giessen, Germany.
¹³ Wuhan University, Wuhan 430072, People's Republic of China.
¹⁴ Ankara University, Dogol Caddesi, 06100 Tandogan, Ankara, Turkey;
¹⁵ Dogus University, 34722 Istanbul, Turkey.
¹⁶ Nanjing University, Nanjing 210093, People's Republic of China.
¹⁷ Lanzhou University, Lanzhou 730000, People's Republic of China.
¹⁸ Huangshan College, Huangshan 245000, People's Republic of China.
¹⁹ Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
²⁰ University of Turin, I-10125 Turin, Italy and INFN, I-10125 Turin, Italy.
²¹ Shandong University, Jinan 250100, People's Republic of China.
²² Liaoning University, Shenyang 110036, People's Republic of China.
²³ Nankai university, Tianjin 300071, People's Republic of China.
²⁴ Zhengzhou University, Zhengzhou 450001, People's Republic of China.
²⁵ Tsinghua University, Beijing 100084, People's Republic of China.
²⁶ University of Eastern Piedmont, I-15121 Alessandria, Italy and INFN, I-10125 Turin, Italy.
²⁷ GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany.
²⁸ GuangXi University, Nanning 530004, People's Republic of China.
²⁹ Nanjing Normal University, Nanjing 210023, People's Republic of China.
³⁰ University of Hawaii, Honolulu, Hawaii 96822, USA.
³¹ Bochum Ruhr-University, D-44780 Bochum, Germany.
³² Central China Normal University, Wuhan 430079, People's Republic of China.
³³ Henan Normal University, Xinxiang 453007, People's Republic of China.
³⁴ University of the Punjab, Lahore 54590, Pakistan.
³⁵ Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
³⁶ Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
³⁷ Hunan University, Changsha 410082, People's Republic of China.
³⁸ Hangzhou Normal University, Hangzhou 310036, People's Republic of China.
³⁹ University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
⁴⁰ Seoul National University, Seoul 151-747, Korea.
⁴¹ Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
⁴² Sichuan University, Chengdu 610064, People's Republic of China.
⁴³ Shanxi University, Taiyuan 030006, People's Republic of China.
⁴⁴ Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
⁴⁵ Zhejiang University, Hangzhou 310027, People's Republic of China.
⁴⁶ COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan.
⁴⁷ INFN and University of Perugia, I-06100 Perugia, Italy.
⁴⁸ Beihang University, Beijing 100191, People's Republic of China.
⁴⁹ Uludag University, 16059 Bursa, Turkey.
⁵⁰ Guangxi Normal University, Guilin 541004, People's Republic of China.
⁵¹ Soochow University, Suzhou 215006, People's Republic of China.
⁵² China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China.
⁵³ University of South China, Hengyang 421001, People's Republic of China.

PMID: 24655246
DOI: 10.1103/PhysRevLett.112.092001

Abstract

With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process e+e-→ γX(3872) is observed for the first time with a statistical significance of 6.3σ. The measured mass of the X(3872) is (3871.9 ± 0.7s tat ± 0.2 syst) MeV/c(2), in agreement with previous measurements. Measurements of the product of the cross section σ[e+e- → γX(3872)] and the branching fraction B[X(3872)→π+π-J/ψ] at center-of-mass energies 4.009, 4.229, 4.260, and 4.360 GeV are reported. Our measurements are consistent with expectations for the radiative transition process Y(4260) → γX(3872).