Observation Of E(+)E(-) -> Gamma X(3872) At Besiii

M Ablikim,H X Yang,Z P Zhang,T Hussain,H W Yu,T Held,Cheng Lian Liu, G Varner,F H Liu, T Li,W X Gong,Scott A Braun,Z Y He,X Tang, W Shan,Q A Malik,J F Qiu,R A Briere, A Zhemchugov,K Goetzen,J S Yu,S L Olsen,H M Hu,K Peters,I Tapan,Y G Xie,L S Wang,Z Y Deng, S A Cetin,M Wang,S Pacetti,Bin Zheng,Y P Chu,Z G Zhao,Y J Mao, I Boyko,S X Du,H L Dai,M Destefanis,H P Cheng,Ting Luo,M Leyhe,Y P Guo,Y B Zhao,X H Zhao,P L Wang,Teng Ma,A Kupsc,Q Gao,H Y Zhang, K Y Liu,O Fuks,M N Achasov,D X Lin,C H Li,K Moriya,U Wiedner, Y H Guan,B Y Zhang, T Hu,X F Wang, C Dong,X T Huang, Z B Li,Zhiyong Jiao, J C Li, J L Ping,R E Mitchell,G Rong, Lei Li,H Y Sheng,D M Li,E Prencipe, Z Ning, Ying Jie Sun,A Calcaterra,T C Zhao,N Wu,S S Fang,F C Ma,I Uman,A Q Guo, B J Liu,A V Sarantsev,Wuchen Wu, C Z Yuan,L G Xia,Q P Ji,L Q Qin, Q An, Li Zhou,A G Denig,J S Lange,X Y Song,J S Huang, A Zallo,C X Yu,D Y Wang, C D Fu,O Cakir,K L He, E H Thorndike,J P Zheng,S L Zang,M Shao,Z A Zhu,M Qi,Z A Liu,S P Wen,G F Cao, O Bondarenko,Zhigang Xue,O Albayrak,X K Zhou, X Y Shen, Y B Liu,G F Xu,C F Qiao,X R Chen,Z Y Wang,Y T Gu,Q W Zhao,J C Chen,S J Chen,H B Li,J B Jiao,Y Nefedov, F E Maas, L Fava,F F An,C B Zhang,L L Jiang,X Y Niu,R Baldini Ferroli,Han Liang,Y H Zheng,Y Q Wang,L H Wu, M He,Z T Sun,B X Yu,Z H Qin,J L Fu,S J Zhao, Y Ding,Guoqing Zhao,X Cai, C L Luo, Q Ouyang, C P Shen,Lunan Yan, B Spruck,H P Peng,P R Li, M X Luo, C F Redmer,Y S Zhu,Y H Zhang,Qianqian Liu,M Pelizaeus,J L Zhang,X C Ai,Y P Lu,Jingyun Fang, Huihui Ye,W D Li, X L Luo, L Y Dong, J B Wei,B Zhong, R Poling, S B Liu,J Min,W Gradl,T J Min,X L Kang, P L Liu,L B Guo,W C Yan, B S Zou,C Q Feng, X S Jiang,X L Ji, H Loehner,T Johansson,Gang Li,C J Tang,M Ullrich,E Boger,M Maggiora,J Dong,Z P Mao, Y H Yan, Dingzhang Xiao,J F Chang,M Kavatsyuk,H M Liu,M L Chen, K Sch Nning,Sijin Qian,M R Shepherd, M Ripka,C Hu,Bo Wang, Y B Chen,F A Harris,Xi Peng Xu,S G Wang,Kun Wang,X Y Ma,J F Sun, C Geng,S Nisar,C Morales Morales,S S Sun, M Bertani, K J Zhu, J Z Bai,M H Ye,Q M Ma,K H Rashid,X C Lou,Q J Wang,D P Jin, Y Ban,N Kalantarnayestanaki,M G Zhao,H L Ma,D V Dedovich,J W Zhao,J M Bian,Kai Li, D Croninhennessy, Y Zeng,D H Wei,M H Gu,H Moeini,J G Messchendorp,R G Ping,G R Lu,H S Chen,Shan Ping Yu,N Yu Muchnoi,D H Zhang,J H Zou, M Greco,X N Li,Y F Liang,G R Liao,P Weidenkaff,X D Ruan,C S Ji,Zhiyong Wu,G S Huang,J V Bennett, Q J Xu,Wencong Wang,I Denysenko,S H Zhang,Yun Xia,W L Yuan,Y Gao,M Kornicer,I B Nikolaev,G Chen,Tzungfang Guo,W M Song,P Larin,S Schumann,Lei Huang,Lei Zhao,M Y Dong,Mei Lv,Wei Lai,X H Mo,W Kuehn,X S Qin,J F Hu,Y Qin, B Kloss,Q J Li,D Toth,S Spataro,Y Fang,F F Jing,X K Chu,Liang Xu,M Wolke,X Y Zhang, F Li,Z J Xiao,J P Dai,J G Lu, Michael E Werner,X R Lu,Xuan Liu,A A Zafar, B Kopf,J Zhuang,Shan Jin,M Lara,Y Yuan,Q L Xiu,Y X Yang, Z L Hou, G A Chelkov,Hui Cai,D Ambrose,W M Ding, X L Zhu,Y K Heng,G X Sun, J P Liu, H L Lu,Y L Han,S Ma

PHYSICAL REVIEW LETTERS（2014）

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摘要

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(-) -> gamma X(3872) is observed for the first time with a statistical significance of 6.3 sigma. The measured mass of the X(3872) is (3871.9 +/- 0.7(stat) +/- 0.2(syst)) MeV/c(2), in agreement with previous measurements. Measurements of the product of the cross section sigma[e(+)e(-) -> gamma X(3872)] and the branching fraction B [X(3872) -> pi(+)pi(-)J/psi] 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) -> gamma X(3872).

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