Observation of the ψ(1 3D2) State in e+e-→π+π-γχc1 at BESIII

M Ablikim; M N Achasov; X C Ai; O Albayrak; M Albrecht; D J Ambrose; A Amoroso; F F An; Q An; J Z Bai; R Baldini Ferroli; Y Ban; D W Bennett; J V Bennett; M Bertani; D Bettoni; J M Bian; F Bianchi; E Boger; O Bondarenko; I Boyko; 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; H Y Chen; J C Chen; M L Chen; S J Chen; X Chen; X R Chen; Y B Chen; H P Cheng; X K Chu; G Cibinetto; D Cronin-Hennessy; H L Dai; J P Dai; A Dbeyssi; D Dedovich; Z Y Deng; A Denig; I Denysenko; M Destefanis; F De Mori; Y Ding; C Dong; J Dong; L Y Dong; M Y Dong; S X Du; P F Duan; J Z Fan; J Fang; S S Fang; X Fang; Y Fang; L Fava; F Feldbauer; G Felici; C Q Feng; E Fioravanti; M Fritsch; C D Fu; Q Gao; Y Gao; Z Gao; I Garzia; 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; Y Guo; Y P Guo; Z Haddadi; A Hafner; S Han; Y L Han; X Q Hao; F A Harris; K L He; Z Y He; T Held; Y K Heng; Z L Hou; C Hu; H M Hu; J F Hu; T Hu; Y Hu; G M Huang; G S Huang; H P Huang; J S Huang; X T Huang; Y Huang; T Hussain; Q Ji; Q P Ji; X B Ji; X L Ji; L L Jiang; L W Jiang; X S Jiang; J B Jiao; Z Jiao; D P Jin; S Jin; T Johansson; A Julin; N Kalantar-Nayestanaki; X L Kang; X S Kang; M Kavatsyuk; B C Ke; R Kliemt; B Kloss; O B Kolcu; B Kopf; M Kornicer; W Kuehn; A Kupsc; W Lai; J S Lange; M Lara; P Larin; C Leng; C H Li; Cheng Li; D M Li; F Li; G Li; H B Li; J C Li; Jin Li; K Li; K Li; Lei Li; P R Li; T Li; W D Li; W G Li; X L Li; X M Li; X N Li; X Q Li; Z B Li; H Liang; Y F Liang; Y T Liang; G R Liao; D X Lin; B J Liu; C X Liu; F H Liu; Fang Liu; Feng Liu; H B Liu; H H Liu; H H Liu; H M Liu; J Liu; J P Liu; J Y Liu; K Liu; K Y Liu; L D Liu; P L Liu; Q Liu; S B Liu; X Liu; X X Liu; Y B Liu; Z A Liu; Zhiqiang Liu; Zhiqing Liu; H Loehner; X C Lou; H J Lu; J G Lu; R Q Lu; Y Lu; Y P Lu; C L Luo; M X Luo; T Luo; X L Luo; M Lv; X R Lyu; F C Ma; H L Ma; L L Ma; Q M Ma; S Ma; T Ma; X N Ma; X Y Ma; F E Maas; M Maggiora; Q A Malik; Y J Mao; Z P Mao; S Marcello; J G Messchendorp; J Min; T J Min; R E Mitchell; X H Mo; Y J Mo; C Morales Morales; K Moriya; N Yu Muchnoi; H Muramatsu; Y Nefedov; F Nerling; I B Nikolaev; Z Ning; S Nisar; S L Niu; X Y Niu; S L Olsen; Q Ouyang; S Pacetti; P Patteri; M Pelizaeus; H P Peng; K Peters; J Pettersson; J L Ping; R G Ping; R Poling; Y N Pu; M Qi; S Qian; C F Qiao; L Q Qin; N Qin; X S Qin; Y Qin; Z H Qin; J F Qiu; K H Rashid; C F Redmer; H L Ren; M Ripka; G Rong; X D Ruan; V Santoro; A Sarantsev; M Savrié; K Schoenning; S Schumann; W Shan; M Shao; C P Shen; P X Shen; X Y Shen; H Y Sheng; W M Song; X Y Song; S Sosio; S Spataro; 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; M Tiemens; D Toth; M Ullrich; I Uman; G S Varner; B Wang; B L 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; T Weber; D H Wei; J B Wei; P Weidenkaff; S P Wen; U Wiedner; M Wolke; L H 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; L Yan; W B Yan; W C Yan; Y H Yan; H X Yang; L Yang; Y Yang; Y X Yang; H Ye; M Ye; M H Ye; J H Yin; B X Yu; C X Yu; H W Yu; J S Yu; C Z Yuan; W L Yuan; Y Yuan; A Yuncu; A A Zafar; A Zallo; Y Zeng; B X Zhang; B Y Zhang; C Zhang; C C Zhang; D H Zhang; H H Zhang; H Y Zhang; J J Zhang; J L Zhang; J Q Zhang; J W Zhang; J Y Zhang; J Z Zhang; K Zhang; L Zhang; S H Zhang; X Y Zhang; Y Zhang; Y H Zhang; Y T Zhang; Z H Zhang; Z P Zhang; Z Y Zhang; G Zhao; J W Zhao; J Y Zhao; J Z Zhao; Lei Zhao; Ling Zhao; M G Zhao; Q Zhao; Q W Zhao; S J Zhao; T C Zhao; Y B Zhao; Z G Zhao; A Zhemchugov; B Zheng; J P Zheng; W J 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; S Zhu; X L Zhu; Y C Zhu; Y S Zhu; Z A Zhu; J Zhuang; L Zotti; B S Zou; J H Zou; BESIII Collaboration

doi:10.1103/PhysRevLett.115.011803

Observation of the ψ(1 3D2) State in e+e-→π+π-γχc1 at BESIII

Phys Rev Lett. 2015 Jul 3;115(1):011803. doi: 10.1103/PhysRevLett.115.011803. Epub 2015 Jul 1.

Authors

M Ablikim¹, M N Achasov², X C Ai¹, O Albayrak³, M Albrecht⁴, D J Ambrose⁵, A Amoroso^{6

7}, F F An¹, Q An⁸, J Z Bai¹, R Baldini Ferroli⁹, Y Ban¹⁰, D W Bennett¹¹, J V Bennett³, M Bertani⁹, D Bettoni¹², J M Bian¹³, F Bianchi^{6

7}, E Boger¹⁴, O Bondarenko¹⁵, I Boyko¹⁴, R A Briere³, H Cai¹⁶, X Cai¹, O Cakir¹⁷, A Calcaterra⁹, G F Cao¹, S A Cetin¹⁸, J F Chang¹, G Chelkov¹⁴, G Chen¹, H S Chen¹, H Y Chen¹⁹, J C Chen¹, M L Chen¹, S J Chen²⁰, X Chen¹, X R Chen²¹, Y B Chen¹, H P Cheng²², X K Chu¹⁰, G Cibinetto¹², D Cronin-Hennessy¹³, H L Dai¹, J P Dai²³, A Dbeyssi²⁴, D Dedovich¹⁴, Z Y Deng¹, A Denig²⁵, I Denysenko¹⁴, M Destefanis^{6

7}, F De Mori^{6

7}, Y Ding²⁶, C Dong²⁷, J Dong¹, L Y Dong¹, M Y Dong¹, S X Du²⁸, P F Duan¹, J Z Fan²⁹, J Fang¹, S S Fang¹, X Fang⁸, Y Fang¹, L Fava^{30

7}, F Feldbauer²⁵, G Felici⁹, C Q Feng⁸, E Fioravanti¹², M Fritsch^{24

25}, C D Fu¹, Q Gao¹, Y Gao²⁹, Z Gao⁸, I Garzia¹², C Geng⁸, K Goetzen³¹, W X Gong¹, W Gradl²⁵, M Greco^{6

7}, M H Gu¹, Y T Gu³², Y H Guan¹, A Q Guo¹, L B Guo³³, Y Guo¹, Y P Guo²⁵, Z Haddadi¹⁵, A Hafner²⁵, S Han¹⁶, Y L Han¹, X Q Hao³⁴, F A Harris³⁵, K L He¹, Z Y He²⁷, T Held⁴, Y K Heng¹, Z L Hou¹, C Hu³³, H M Hu¹, J F Hu^{6

7}, T Hu¹, Y Hu¹, G M Huang³⁶, G S Huang⁸, H P Huang¹⁶, J S Huang³⁴, X T Huang³⁷, Y Huang²⁰, T Hussain³⁸, Q Ji¹, Q P Ji²⁷, X B Ji¹, X L Ji¹, L L Jiang¹, L W Jiang¹⁶, X S Jiang¹, J B Jiao³⁷, Z Jiao²², D P Jin¹, S Jin¹, T Johansson³⁹, A Julin¹³, N Kalantar-Nayestanaki¹⁵, X L Kang¹, X S Kang²⁷, M Kavatsyuk¹⁵, B C Ke³, R Kliemt²⁴, B Kloss²⁵, O B Kolcu¹⁸, B Kopf⁴, M Kornicer³⁵, W Kuehn⁴⁰, A Kupsc³⁹, W Lai¹, J S Lange⁴⁰, M Lara¹¹, P Larin²⁴, C Leng⁷, C H Li¹, Cheng Li⁸, D M Li²⁸, F Li¹, G Li¹, H B Li¹, J C Li¹, Jin Li⁴¹, K Li⁴², K Li³⁷, Lei Li⁴³, P R Li⁴⁴, T Li³⁷, W D Li¹, W G Li¹, X L Li³⁷, X M Li³², X N Li¹, X Q Li²⁷, Z B Li⁴⁵, H Liang⁸, Y F Liang⁴⁶, Y T Liang⁴⁰, G R Liao⁴⁷, D X Lin²⁴, B J Liu¹, C X Liu¹, F H Liu⁴⁸, Fang Liu¹, Feng Liu³⁶, H B Liu³², H H Liu⁴⁹, H H Liu¹, H M Liu¹, J Liu¹, J P Liu¹⁶, J Y Liu¹, K Liu²⁹, K Y Liu²⁶, L D Liu¹⁰, P L Liu¹, Q Liu⁴⁴, S B Liu⁸, X Liu²¹, X X Liu⁴⁴, Y B Liu²⁷, Z A Liu¹, Zhiqiang Liu¹, Zhiqing Liu²⁵, H Loehner¹⁵, X C Lou¹, H J Lu²², J G Lu¹, R Q Lu⁵⁰, Y Lu¹, Y P Lu¹, C L Luo³³, M X Luo⁵¹, T Luo³⁵, X L Luo¹, M Lv¹, X R Lyu⁴⁴, F C Ma²⁶, H L Ma¹, L L Ma³⁷, Q M Ma¹, S Ma¹, T Ma¹, X N Ma²⁷, X Y Ma¹, F E Maas²⁴, M Maggiora^{6

7}, Q A Malik³⁸, Y J Mao¹⁰, Z P Mao¹, S Marcello^{6

7}, J G Messchendorp¹⁵, J Min¹, T J Min¹, R E Mitchell¹¹, X H Mo¹, Y J Mo³⁶, C Morales Morales²⁴, K Moriya¹¹, N Yu Muchnoi², H Muramatsu¹³, Y Nefedov¹⁴, F Nerling²⁴, I B Nikolaev², Z Ning¹, S Nisar⁵², S L Niu¹, X Y Niu¹, S L Olsen⁴¹, Q Ouyang¹, S Pacetti⁵³, P Patteri⁹, M Pelizaeus⁴, H P Peng⁸, K Peters³¹, J Pettersson³⁹, J L Ping³³, R G Ping¹, R Poling¹³, Y N Pu⁵⁰, M Qi²⁰, S Qian¹, C F Qiao⁴⁴, L Q Qin³⁷, N Qin¹⁶, X S Qin¹, Y Qin¹⁰, Z H Qin¹, J F Qiu¹, K H Rashid³⁸, C F Redmer²⁵, H L Ren⁵⁰, M Ripka²⁵, G Rong¹, X D Ruan³², V Santoro¹², A Sarantsev¹⁴, M Savrié⁵⁴, K Schoenning³⁹, S Schumann²⁵, W Shan¹⁰, M Shao⁸, C P Shen¹⁹, P X Shen²⁷, X Y Shen¹, H Y Sheng¹, W M Song¹, X Y Song¹, S Sosio^{6

7}, S Spataro^{6

7}, G X Sun¹, J F Sun³⁴, S S Sun¹, Y J Sun⁸, Y Z Sun¹, Z J Sun¹, Z T Sun¹¹, C J Tang⁴⁶, X Tang¹, I Tapan⁵⁵, E H Thorndike⁵, M Tiemens¹⁵, D Toth¹³, M Ullrich⁴⁰, I Uman¹⁸, G S Varner³⁵, B Wang²⁷, B L Wang⁴⁴, D Wang¹⁰, D Y Wang¹⁰, K Wang¹, L L Wang¹, L S Wang¹, M Wang³⁷, P Wang¹, P L Wang¹, Q J Wang¹, S G Wang¹⁰, W Wang¹, X F Wang²⁹, Y D Wang⁹, Y F Wang¹, Y Q Wang²⁵, Z Wang¹, Z G Wang¹, Z H Wang⁸, Z Y Wang¹, T Weber²⁵, D H Wei⁴⁷, J B Wei¹⁰, P Weidenkaff²⁵, S P Wen¹, U Wiedner⁴, M Wolke³⁹, L H Wu¹, Z Wu¹, L G Xia²⁹, Y Xia⁵⁰, D Xiao¹, Z J Xiao³³, Y G Xie¹, Q L Xiu¹, G F Xu¹, L Xu¹, Q J Xu⁴², Q N Xu⁴⁴, X P Xu⁵⁶, L Yan⁸, W B Yan⁸, W C Yan⁸, Y H Yan⁵⁰, H X Yang¹, L Yang¹⁶, Y Yang³⁶, Y X Yang⁴⁷, H Ye¹, M Ye¹, M H Ye⁵⁷, J H Yin¹, B X Yu¹, C X Yu²⁷, H W Yu¹⁰, J S Yu²¹, C Z Yuan¹, W L Yuan²⁰, Y Yuan¹, A Yuncu¹⁸, A A Zafar³⁸, A Zallo⁹, Y Zeng⁵⁰, B X Zhang¹, B Y Zhang¹, C Zhang²⁰, C C Zhang¹, D H Zhang¹, H H Zhang⁴⁵, H Y Zhang¹, J J Zhang¹, J L Zhang¹, J Q Zhang¹, J W Zhang¹, J Y Zhang¹, J Z Zhang¹, K Zhang¹, L Zhang¹, S H Zhang¹, X Y Zhang³⁷, Y Zhang¹, Y H Zhang¹, Y T Zhang⁸, Z H Zhang³⁶, Z P Zhang⁸, Z Y Zhang¹⁶, G Zhao¹, J W Zhao¹, J Y Zhao¹, J Z Zhao¹, Lei Zhao⁸, Ling Zhao¹, M G Zhao²⁷, Q Zhao¹, Q W Zhao¹, S J Zhao²⁸, T C Zhao¹, Y B Zhao¹, Z G Zhao⁸, A Zhemchugov¹⁴, B Zheng⁵⁸, J P Zheng¹, W J Zheng³⁷, Y H Zheng⁴⁴, B Zhong³³, L Zhou¹, Li Zhou²⁷, X Zhou¹⁶, X K Zhou⁸, X R Zhou⁸, X Y Zhou¹, K Zhu¹, K J Zhu¹, S Zhu¹, X L Zhu²⁹, Y C Zhu⁸, Y S Zhu¹, Z A Zhu¹, J Zhuang¹, L Zotti^{6

7}, 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 Bochum Ruhr-University, D-44780 Bochum, Germany.
⁵ University of Rochester, Rochester, New York 14627, USA.
⁶ University of Turin, I-10125 Turin, Italy.
⁷ INFN, I-10125 Turin, Italy.
⁸ University of Science and Technology of China, Hefei 230026, People's Republic of China.
⁹ INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
¹⁰ Peking University, Beijing 100871, People's Republic of China.
¹¹ Indiana University, Bloomington, Indiana 47405, USA.
¹² INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
¹³ University of Minnesota, Minneapolis, Minnesota 55455, USA.
¹⁴ Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
¹⁵ KVI-CART, University of Groningen, NL-9747 AA Groningen, Netherlands.
¹⁶ Wuhan University, Wuhan 430072, People's Republic of China.
¹⁷ Istanbul Aydin University, 34295 Sefakoy, Istanbul, Turkey.
¹⁸ Dogus University, 34722 Istanbul, Turkey.
¹⁹ Beihang University, Beijing 100191, People's Republic of China.
²⁰ Nanjing University, Nanjing 210093, People's Republic of China.
²¹ Lanzhou University, Lanzhou 730000, People's Republic of China.
²² Huangshan College, Huangshan 245000, People's Republic of China.
²³ Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
²⁴ Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
²⁵ Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
²⁶ Liaoning University, Shenyang 110036, People's Republic of China.
²⁷ Nankai University, Tianjin 300071, People's Republic of China.
²⁸ Zhengzhou University, Zhengzhou 450001, People's Republic of China.
²⁹ Tsinghua University, Beijing 100084, People's Republic of China.
³⁰ University of Eastern Piedmont, I-15121 Alessandria, Italy.
³¹ GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany.
³² GuangXi University, Nanning 530004, People's Republic of China.
³³ Nanjing Normal University, Nanjing 210023, People's Republic of China.
³⁴ Henan Normal University, Xinxiang 453007, People's Republic of China.
³⁵ University of Hawaii, Honolulu, Hawaii 96822, USA.
³⁶ Central China Normal University, Wuhan 430079, People's Republic of China.
³⁷ Shandong University, Jinan 250100, People's Republic of China.
³⁸ University of the Punjab, Lahore-54590, Pakistan.
³⁹ Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
⁴⁰ Justus Liebig University Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany.
⁴¹ Seoul National University, Seoul, 151-747 Korea.
⁴² Hangzhou Normal University, Hangzhou 310036, People's Republic of China.
⁴³ Beijing Institute of Petrochemical Technology, Beijing 102617, People's Republic of China.
⁴⁴ University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
⁴⁵ Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
⁴⁶ Sichuan University, Chengdu 610064, People's Republic of China.
⁴⁷ Guangxi Normal University, Guilin 541004, People's Republic of China.
⁴⁸ Shanxi University, Taiyuan 030006, People's Republic of China.
⁴⁹ Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
⁵⁰ Hunan University, Changsha 410082, People's Republic of China.
⁵¹ Zhejiang University, Hangzhou 310027, People's Republic of China.
⁵² COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan.
⁵³ INFN and University of Perugia, I-06100 Perugia, Italy.
⁵⁴ University of Ferrara, I-44122 Ferrara, Italy.
⁵⁵ Uludag University, 16059 Bursa, Turkey.
⁵⁶ Soochow University, Suzhou 215006, People's Republic of China.
⁵⁷ China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China.
⁵⁸ University of South China, Hengyang 421001, People's Republic of China.

PMID: 26182091
DOI: 10.1103/PhysRevLett.115.011803

Abstract

We report the observation of the X(3823) state in the process e+e-→π+π-X(3823)→π+π-γχc1 with a statistical significance of 6.2σ, in data samples at center-of-mass energies sqrt[s]=4.230, 4.260, 4.360, 4.420, and 4.600 GeV collected with the BESIII detector at the BEPCII electron positron collider. The measured mass of the X(3823) state is (3821.7±1.3±0.7) MeV/c2, where the first error is statistical and the second systematic, and the width is less than 16 MeV at the 90% confidence level. The products of the Born cross sections for e+e-→π+π-X(3823) and the branching ratio B[X(3823)→γχc1,c2] are also measured. These measurements are in good agreement with the assignment of the X(3823) state as the ψ(1 3D2) charmonium state.