Measurement Of B(Psi(3770) -> Gamma Chi(C1)) And Search For Psi(3770) -> Gamma Chi(C2) M Ablikim , M N Achasov , X C Ai , O Albayrak , M Albrecht , D Ambrose , A Amoroso , F F An , Q An , J Z Bai , R Baldini Ferroli , Yue Ban , D W Bennett , J V Bennett , M Bertani , D Bettoni , J M Bian , F Bianchi , E Boger , Bondarenko , I Boyko , R A Briere , Hui Cai , Xiaoyi Cai , O Cakir , A Calcaterra , G F Cao , S A Cetin , J F Chang , G A Chelkov , G 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 , G Cibinetto , D Croninhennessy , H L Dai , J P Dai , A Dbeyssi , D V Dedovich , Z Y Deng , A G Denig , I Denysenko , M Destefanis , F De Mori , Yongfan Ding , Chunming Dong , Jing Dong , L Y Dong , M Y Dong , S X Du , P F Duan , J Z Fan , Junjian Fang , S S Fang , Xin Fang , Y Fang , L Fava , F Feldbauer , G Felici , C Q Feng , E Fioravanti , M Fritsch , C D Fu , Q Gao , X Y Gao , Yongsheng Gao , Zhengnan 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 P Guo , Z Haddadi , A Hafner , Shuping 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 S Huang , H P Huang , J S Huang , X T Huang , Yan Huang , T Hussain , Q P Ji , X B Ji , L W Jiang , X S Jiang , J B Liao , Z Liao , D P Jin , S Jin , Tord Johansson , A Julin , N Kalantarnayestanaki , X S Kang , M Kavatsyuk , B C Ke , R Kliemt , B Kloss , O B Kolcu , B Kopf , M Komicer , W Kuehn , A Kupsc , Weichi Lai , J S Lange , M Lara , P Larin , C Leng , C H Li , D M Li , F Li , Guohui Li , H B Li , J C Li , Kai Li , Lei Li , P R Li , T Li , W G Li , X L Li , Zhen Bo Li , H Liang , Y F Liang , G R Liao , D X Lin , B J Liu , C X Liu , F H Liu , H B Liu , Jian Ping Liu , K Y Liu , L D Liu , P L Liu , Qing Liu , S B Liu , X X Liu , Yu Bin Liu , Zhi An Liu , H Loehner , X C Lou , H J Lu , J G Lu , R Q Lu , Y P Lu , C L Luo , M X Luo , Tao Luo , X L Luo , M Lv , X R Lyu , F C Ma , H L Ma , L L Ma , Q M Ma , Shihong Ma , T 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 , Zhijun Ning , S Nisar , S L Niu , X Y Niu , S L Olsen , Qun Ouyang , S Pacetti , P Patteri , M Pelizaeus , H P Peng , K Peters , Joachim 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 V Sarantsev , M Savrie , Karin Schonning , S Schumann , Wenchao 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 Z Sun , Z J Sun , C J Tang , X Tang , I Tapan , E H Thomdike , M Tiemens , D Toth , M S Ullrich , I Uman , G Varner , Bao Lai Wang , D Y Wang , Kangning Wang , L L Wang , Manchuriga Wang , P L Wang , Qi Jie Wang , S G Wang , Wei Wang , X F Wang , Y Q Wang , Z Y Wang , T Weber , D H Wei , J B Wei , P Weidenkaff , S P Wen , U Wiedner , M Wolke , L H Wu , Zhigang Wu , L G Xia , Youyou Xia , D Xiao , Z J Xiao , Y G Xie , Q L Xiu , G F Xu , Lin Xu , Q N Xu , Xi Peng Xu , L Yan , W C Yan , Y H Yan , H X Yang , Li Yang , Y X Yang , H Ye , M H Ye , Jing Hai Yin , B X Yu , C X Yu , H W Yu , J S Yu , C Z Yuan , W L Yuan , Yuan Yuan , A Yuncu , A A Zafar , A Zallo , Y Zeng , B Y Zhang , C C Zhang , D H Zhang , Hai Yan Zhang , J Z Zhang , K Zhang , Liwei Zhang , Shu Hua Zhang , X Y Zhang , Y H Zhang , Z P Zhang , G Zhao , J Y Zhao , Ling Zhao , M G Zhao , Q W Zhao , S J Zhao , T C Zhao , Y B Zhao , Z G Zhao , A Zheruchugov , Bin Zheng , J P Zheng , W J Zheng , Y H Zheng , B Zhong , Li Zhou , X Y Zhou , K J Zhu , Siqi Zhu , X L Zhu , Y S Zhu , Z A Zhu , J Zhuang , Linda A Zotti , B S Zou , J H Zou PHYSICAL REVIEW D（2015）
摘要
We report a measurement of the branching fraction for psi(3770) -> gamma chi(c1) and search for the transition psi(3770) -> gamma chi(c2) based on 2.92 fb(-1) of e(+)e(-) data accumulated at root s = 3.773 GeV with the BESIII detector at the BEPCII collider. We measure B(psi(3770) -> gamma chi(c1)) = (2.48 +/- 0.15 +/- 0.23) x 10(-3), which is the most precise measurement to date. The upper limit on the branching fraction of psi(3770) -> gamma chi(c2) at a 90% confidence level is B(psi(3770) -> gamma chi(c2)) < 0.64 x 10(-3). The corresponding partial widths are Gamma(psi(3770) -> gamma chi(c1)) = (67.5 +/- 4.1 +/- 6.7)keV and Gamma(psi(3770) -> gamma chi(c2)) < 17.4 keV.
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