Precision Measurement of the Branching Fractions of η^{'} Decays.

M Ablikim,M N Achasov,S Ahmed,M Albrecht,M Alekseev,A Amoroso, F F An, Q An,Y Bai,O Bakina,R Baldini Ferroli, Y Ban,K Begzsuren,D W Bennett,J V Bennett, N Berger,M Bertani,D Bettoni,F Bianchi,E Boger, I Boyko,R A Briere,H Cai,X Cai,A Calcaterra,G F Cao,S A Cetin,J Chai, J F Chang,W L Chang, G Chelkov,G Chen, H S Chen, J C Chen,M L Chen,P L Chen, S J Chen,X R Chen, Y B Chen, W Cheng, X K Chu,G Cibinetto,F Cossio,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,Z L Dou, S X Du, P F Duan,J Z Fan, J Fang,S S Fang,Y Fang,R Farinelli, L Fava, F Feldbauer,G Felici, C Q Feng,M Fritsch, C D Fu,Q Gao,X L Gao,Y Gao,Y G Gao,Z Gao, B Garillon, I Garzia,A Gilman,K Goetzen,L Gong, W X Gong,W Gradl,M Greco,L M Gu,M H Gu, Y T Gu,A Q Guo,L B Guo,R P Guo,Y P Guo,A Guskov,Z Haddadi,S Han, X Q Hao,F A Harris,K L He, F H Heinsius,T Held,Y K Heng,Z L Hou,H M Hu, J F Hu, T Hu,Y Hu,G S Huang,J S Huang,X T Huang,X Z Huang,Z L Huang,T Hussain,W Ikegami Andersson,W Imoehl,M Irshad,Q Ji,Q P Ji,X B Ji,X L Ji,H L Jiang,X S Jiang,X Y Jiang, J B Jiao,Z Jiao, D P Jin,S Jin,Y Jin,T Johansson,N Kalantar-Nayestanaki,X S Kang,M Kavatsyuk, B C Ke,I K Keshk,T Khan,A Khoukaz, P Kiese,R Kiuchi, R Kliemt,L Koch,O B Kolcu, B Kopf,M Kuemmel,M Kuessner,A Kupsc, M Kurth,W Kühn,J S Lange, P Larin, L Lavezzi,S Leiber,H Leithoff,C Li,Cheng Li,D M Li,F Li,F Y Li,G Li,H B Li,H J Li,J C Li,J W Li,K J Li,Kang Li,Ke Li,L K Li,Lei Li,P L Li,P R Li,Q Y Li, T Li,W D Li,W G Li,X L Li,X N Li,X Q Li,Z B Li,H Liang,Y F Liang,Y T Liang, G R Liao,L Z Liao,J Libby,C X Lin,D X Lin, B Liu,B J Liu,C X Liu,D Liu,D Y Liu,F H Liu, Fang Liu, Feng Liu,H B Liu,H L Liu,H M Liu,Huanhuan Liu,Huihui Liu,J B Liu,J Y Liu,K Y Liu,Ke Liu,L D Liu,Q Liu,S B Liu,X Liu,Y B Liu,Z A Liu,Zhiqing Liu,Y F Long,X C Lou, H J Lu, J G Lu,Y Lu,Y P Lu,C L Luo,M X Luo, P W Luo,T Luo,X L Luo,S Lusso, X R Lyu,F C Ma,H L Ma,L L Ma,M M Ma,Q M Ma,X N Ma,X Y Ma,Y M Ma, F E Maas,M Maggiora,S Maldaner, Q A Malik,A Mangoni, Y J Mao, Z P Mao,S Marcello,Z X Meng,J G Messchendorp,G Mezzadri,J Min,T J Min, R E Mitchell, X H Mo,Y J Mo,C Morales Morales,N Yu Muchnoi,H Muramatsu,A Mustafa, S Nakhoul,Y Nefedov, F Nerling, I B Nikolaev, Z Ning,S Nisar,S L Niu,X Y Niu,S L Olsen,Q Ouyang,S Pacetti,Y Pan, M Papenbrock,P Patteri,M Pelizaeus,J Pellegrino, H P Peng,Z Y Peng,K Peters,J Pettersson,J L Ping, R G Ping, A Pitka,R Poling,V Prasad, H R Qi, M Qi,T Y Qi,S Qian,C F Qiao,N Qin,X S Qin,Z H Qin, J F Qiu,S Q Qu, K H Rashid,C F Redmer,M Richter, M Ripka,A Rivetti,M Rolo, G Rong,Ch Rosner, A Sarantsev,M Savrié,K Schoenning, W Shan,X Y Shan,M Shao,C P Shen,P X Shen,X Y Shen,H Y Sheng,X Shi,J J Song,W M Song,X Y Song, S Sosio,C Sowa, S Spataro,F F Sui,G X Sun,J F Sun,L Sun,S S Sun,X H Sun,Y J Sun,Y K Sun,Y Z Sun,Z J Sun,Z T Sun, Y T Tan,C J Tang,G Y Tang,X Tang, M Tiemens,B Tsednee,I Uman,B Wang,B L Wang,C W Wang,D Wang, D Y Wang,H H Wang,K Wang,L L Wang,L S Wang,M Wang,Meng Wang,P Wang,P L Wang,W P Wang, X F Wang,Y Wang, Y F Wang, Y Q Wang,Z Wang, Z G Wang,Z Y Wang,Zongyuan Wang,T Weber, D H Wei, P Weidenkaff,S P Wen,U Wiedner,M Wolke,L H Wu,L J Wu,Z Wu,L Xia,X Xia,Y Xia, D Xiao,Y J Xiao,Z J Xiao,Y G Xie,Y H Xie, X A Xiong,Q L Xiu,G F Xu,J J Xu,L Xu, Q J Xu, X P Xu,F Yan,L Yan,W B Yan,W C Yan, Y H Yan, H J Yang, H X Yang,L Yang, R X Yang,S L Yang, Y H Yang,Y X Yang,Yifan Yang,Z Q Yang,M Ye,M H Ye, J H Yin,Z Y You,B X Yu,C X Yu,J S Yu, C Z Yuan,Y Yuan, A Yuncu,A A Zafar,Y Zeng, B X Zhang,B Y Zhang, C C Zhang, D H Zhang, H H Zhang,H Y Zhang, J Zhang, J L Zhang, J Q Zhang, J W Zhang,J Y Zhang, J Z Zhang,K Zhang,L Zhang,S F Zhang, T J Zhang,X Y Zhang,Y Zhang,Y H Zhang,Y T Zhang,Yang Zhang,Yao Zhang, Yu 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,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,Q Zhou,X Zhou,X K Zhou,X R Zhou,X Y Zhou,Xiaoyu Zhou,Xu Zhou,A N Zhu,J Zhu,K Zhu,K J Zhu,S Zhu, S H Zhu,X L Zhu, Y C Zhu, Y S Zhu,Z A Zhu, J Zhuang,B S Zou, J H Zou

PHYSICAL REVIEW LETTERS（2019）

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摘要

Based on a sample of (1310.6 +/- 7.0) x 10(6)J/psi events collected with the BESIII detector, we present measurements of J=. and. 0 absolute branching fractions using the process J/psi -> gamma eta'. By analyzing events where the radiative photon converts into an e(+)e(-) pair, the branching fraction for J/psi -> gamma eta'is measured to be (5.27 +/- 0.03 +/- 0.05) x 10(-3). The absolute branching fractions of the five dominant decay channels of the. 0 are then measured for the first time and are determined to be B(eta' -> gamma pi(+)pi(-))= (29.90 +/- 0.03 +/- 0.55)%, B(eta' -> eta pi(+)pi(-)) = (41.24 +/- 0.08 +/- 1.24)%, B(eta' -> gamma gamma) = (21.36 +/- 0.10 +/- 0.92)%, B(eta' -> gamma omega) = (2.489 +/- 0.018 +/- 0.074)%, and B(eta' -> gamma gamma) = (2.331 +/- 0.012 +/- 0.035)%, where the first uncertainties are statistical and the second systematic.

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branching fractions,precision,<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml

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