Observation Of The Dalitz Decay Eta ' -> Gamma E(+)E(-) M Ablikim , H X Yang , Z P Zhang , H L Ren , Tanveer Hussain , H W Yu , T Held , G Varner , F H Liu , T Li , W X Gong , Z Y He , X Tang , Wei Shan , Y Hu , Q A Malik , J F Qiu , Shanan Zhu , J Z Zhao , R A Briere , H B Liu , P F Duan , A Zhemchugov , K Goetzen , J S Yu , S L Olsen , H M Hu , M Kavatsyuk , K Peters , I Tapan , Y G Xie , L S Wang , Y N Pu , Y F Wang , Z Y Deng , S A Cetin , H P Peng , M Wang , S Pacetti , Bo Zheng , Z G Zhao , Y J Mao , I Boyko , S X Du , H L Dai , M Destefanis , H P Cheng , T Luo , M Albrecht , Y P Guo , Y B Zhao , P L Wang , Teng Ma , A Kupsc , Q Gao , H Y Zhang , K Y Liu , C C Zhang , B L Wang , Y Huang , M N Achasov , D X Lin , T Weber , C H Li , K Moriya , U Wiedner , Y J Mo , Y H Guan , B Y Zhang , T Hu , X X Liu , X F Wang , Chunhua Dong , X T Huang , Z B Li , Zhaoyang Jiao , Linda A Zotti , H P Huang , E Fioravanti , J C Li , J L Ping , R E Mitchell , G Rong , D Bettoni , Lei Li , S Marcello , H Y Sheng , D M Li , Y C Zhu , Z Ning , , Z Haddadi , A Calcaterra , X N Ma , T C Zhao , S S Fang , F C Ma , I Uman , S Sosio , A Q Guo , B J Liu , I Garzia , 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 , Xun Yu Zhou , W J Zheng , S Han , J S Huang , A Zallo , C X Yu , A Hafner , D Y Wang , C D Fu , O Cakir , Z J Sun , K L He , E H Thorndike , J P Zheng , J P Liu , M Tiemens , Ming Shao , Z A Zhu , M Qi , Z A Liu , S P Wen , G F Cao , K Schoenning , O Bondarenko , O Albayrak , X Y Shen , Y B Liu , G F Xu , C F Qiao , X R Chen , Y T Gu , Q W Zhao , J C Chen , H B Li , J B Jiao , Y Nefedov , F E Maas , A Amoroso , L Fava , F F An , G Cibinetto , H J Lu , X Y Niu , Huaping Liang , Y H Zheng , L H Wu , Dennis W Bennett , B X Yu , Z H Qin , F Bianchi , S J Zhao , Yan Ding , Guiqiu Zhao , Xin Cai , A Dbeyssi , C L Luo , R Baldini Ferroli , L W Jiang , Q Ouyang , C P Shen , Lichao Yan , R Kliemt , P R Li , M X Luo , C F Redmer , Qi Liu , M Pelizaeus , J L Zhang , X C Ai , Y P Lu , H L Ma , Jianan Fang , Hui Ye , N Qin , W D Li , X L Luo , L D Liu , L Y Dong , J B Wei , B C Ke , B Zhong , Z J Xiao , R Poling , S B Liu , J Min , W Gradl , H Y Chen , T J Min , X L Kang , A V Sarantsev , Xuefeng Fang , P L Liu , L B Guo , W C Yan , B S Zou , C Q Feng , X S Jiang , X L Ji , H Loehner , Yanzhi Xia , H Muramatsu , X Y Gao , Gordon Li , C J Tang , C X Liu , M S Ullrich , E Boger , M Maggiora , Jixin Dong , Z P Mao , A Yuncu , Y H Yan , Dong Xiao , J F Chang , W Kuhn , M L Chen , S Qian , Z G Wang , M Ripka , C Hu , Y B Chen , F A Harris , X P Xu , S G Wang , Z Gao , Kai Wang , J F Sun , G Felici , Li Yang , Y Z Sun , C Geng , S Nisar , J H Yin , C Morales Morales , S S Sun , M Bertani , K J Zhu , X Q Hao , J Z Bai , M H Ye , Q M Ma , K H Rashid , X C Lou , V Santoro , Q J Wang , D P Jin , N Kalantarnayestanaki , L L Ma , M G Zhao , A Julin , D V Dedovich , F Nerling , J M Bian , Kai Li , D Croninhennessy , Yanxing Zeng , D H Wei , M H Gu , J G Messchendorp , R G Ping , J Z Fan , N Yu Muchnoi , Dong H Zhang , J H Zou , M Greco , G R Liao , P Weidenkaff , X D Ruan , Zhentao Wu , G S Huang , X Q Li , J V Bennett , Wei Wang , P Patteri , I Denysenko , S H Zhang , Torbjorn Johansson , W L Yuan , Yuan Gao , M Kornicer , C Leng , I B Nikolaev , Genyun Chen , W M Song , P Larin , S Schumann , Lei Zhao , M Y Dong , Meng Lv , W Lai , X H Mo , L Zhang , X S Qin , J F Hu , Y Qin , B Kloss , D Toth , S Spataro , Yaquan Fang , S J Chen , X K Chu , Liwen Xu , M Wolke , M Savrie , S L Niu , X Y Zhang , Famei Li , Y Ban , Y T Liang , J P Dai , Y H Zhang , Q N Xu , O B Kolcu , J G Lu , P X Shen , A A Zafar , B Kopf , J Zhuang , Kai Zhang , S Jin , M Lara , Yuan Yuan , Q L Xiu , Y X Yang , Z L Hou , R Q Lu , G A Chelkov , Hui Cai , D Ambrose , F Feldbauer , F De Mori , M Fritsch , X L Zhu , Y K Heng , G X Sun , X R Lyu , Y L Han , S Ma PHYSICAL REVIEW D（2015）
摘要
We report the first observation of the Dalitz decay eta' -> gamma e(+)e(-), based on a data sample of 1.31 billion J/psi events collected with the BESIII detector. The eta' mesons are produced via the J/psi -> gamma eta' decay process. The ratio (eta' -> gamma e(+)e(-))/Gamma (eta' -> gamma gamma) is measured to be (2.13 +/- 0.09(stat) +/- 0.07(sys)) x 10(-2). This corresponds to a branching fraction B(eta' -> gamma e(+)e(-)) = (4.69 +/- 0.20(stat) +/- 0.23(sys)) x 10(-4). The transition form factor is extracted and different expressions are compared to the measured dependence on the e(+)e(-) invariant mass. The results are consistent with the prediction of the vector meson dominance model.
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meson, natural sciences, branching ratio, physical sciences
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