Observation of electromagnetic Dalitz decays J/psi -g Pe(+)e(-)

M Ablikim,M N Achasov,X C Ai,O Albayrak,M Albrecht,D 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,Haiying Cai,Xu Cai,O Cakir,A Calcaterra,G F Cao, S A Cetin,J F Chang, G A Chelkov,Guoqiang Chen, H S Chen, J C Chen,M L Chen, S J Chen,X R Chen, Y B Chen,H P Cheng,X K Chu,Y P Chu,D Croninhennessy,H L Dai,J P Dai,D V Dedovich, Z Y Deng,A G Denig,I Denysenko,M Destefanis,W M Ding,Yan Ding,Chen Dong,Jing Dong, L Y Dong,M Y Dong,S X Du,J Z Fan,Jun Fang,S S Fang,Yaquan Fang, L Fava,C Q Feng, C D Fu,J L Fu,O Fuks,Qingwei Gao,Yong 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 S Huang,H P Huang,J S Huang, Lisu Huang,X T Huang,Y Huang,T Hussain,C S Ji,Q P Ji,X B Ji,L W Jiang,X S Jiang,J B Jiao,Zongxia Jiao,D P Jin,S Jin,Tord Johansson,N Kalantarnayestanaki,X L Kang,M Kavatsyuk, B Kloss, B Kopf,M Kornicer,W Kuehn,A Kupsc,W Lai, J S Lange,M Lara,P Larin,M Leyhe, Chun Hua Li,D M Li,Fangfang Li,Guoliang Li,H B Li,J C Li,K Li, Lei Li, P R Li,Q J Li, T Li,Wei Guo Li,X N Li,Z B Li,Han Liang,Y T Liang,D X Lin,B J Liu,C X Liu, F H Liu, H H Liu, J P Liu,K Y Liu, P L Liu,Qi Liu, Sheng Bing Liu,Xiaopeng Liu,Y B Liu,Z A Liu, H Loehner,X C Lou,G R Lu,H J Lu,J G Lu,X R Lu,Y P Lu,C L Luo, M X Luo,Tianhong Luo, X L Luo,M Lv,F C Ma,H L Ma,Q M Ma,S Ma,Teng 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,M Qi,Sijin 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 V Sarantsev,Karin Schonning,S Schumann,W Shan, Minhua 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, Ying Jie Sun,Z J Sun,C J Tang,X Tang,I Tapan, E H Thorndike,D Toth,M Ullrich, I Uman, G Varner,Bo Wang, D Y Wang, Kuanquan Wang,L S Wang,Muguang Wang,P L Wang,Q J Wang,S G Wang,Wei Wang,Xiao Feng Wang, Y Q Wang, Z Y Wang,D H Wei, J B Wei,P Weidenkaff,S P Wen,Matthias Werner,U Wiedner,M Wolke,L H Wu,Na Wu,Zhixiang Wu,L G Xia,Yan Xia, D Xiao, Z J Xiao,Y G Xie,Q L Xiu,G F Xu,Lin Xu, Q N Xu,X P Xu,Zhengshan Xue,Lirong Yan,W B Yan, Y H Yan,H X Yang,Li Yang,Y X Yang,Hui 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,Yifei Yuan,A Yuncu,A A Zafar, A Zallo,S L Zang,Yong Zeng, B Y Zhang, Cun Bao Zhang,D H Zhang,H H Zhang,Jian Wei Zhang,S H Zhang,X J Zhang, Y H Zhang, Z Y Zhang,G Zhao, Jun Wen Zhao,Lei Zhao,M G Zhao, Q W Zhao,S J Zhao,T C Zhao,X H Zhao,Y B Zhao,Z G Zhao,A Zhemchugov,Bojian Zheng,J P Zheng, Y H Zheng,B Zhong,Liping Zhou, X R Zhou, K J Zhu,S H Zhu, X L Zhu, Y C Zhu,Z A Zhu, J Zhuang,B S Zou,J H Zou

PHYSICAL REVIEW D（2014）

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摘要

Based on a sample of (225.3 +/- 2.8) x 10(6) J/psi events collected with the BESIII detector, the electromagnetic Dalitz decays of J/psi -> Pe(+)e(-)(P = eta'/eta/pi(0)) are studied. By reconstructing the pseudoscalar mesons in various decay modes, the decays J/psi -> eta'e(+)e(-), J/psi -> eta e(+)e(-), and J/psi -> pi(0)e(+)e(-) are observed for the first time. The branching fractions are determined to be B(J/psi -> eta'e(+)e(-)) = (5.81 +/- 0.16 +/- 0.31) x 10(-5), B(J/psi -> eta e(+)e(-)) = (1.16 +/- 0.07 +/- 0.06) x 10(-5), and B(J/psi -> pi(0)e(+)e(-)) = (7.56 +/- 1.32 +/- 0.50) x 10(-7), where the first errors are statistical and the second ones systematic.

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