Ablikim M, Achasov M N, Ahmed S, Albrecht M, Alekseev M, Amoroso A, An F F, An Q, Bai Y, Bakina O, Baldini Ferroli R, Ban Y, Begzsuren K, Bennett D W, Bennett J V, Berger N, Bertani M, Bettoni D, Bianchi F, Boger E, Boyko I, Briere R A, Cai H, Cai X, Calcaterra A, Cao G F, Cetin S A, Chai J, Chang J F, Chang W L, Chelkov G, Chen G, Chen H S, Chen J C, Chen M L, Chen P L, Chen S J, Chen X R, Chen Y B, Cheng W, Chu X K, Cibinetto G, Cossio F, Dai H L, Dai J P, Dbeyssi A, Dedovich D, Deng Z Y, Denig A, Denysenko I, Destefanis M, De Mori F, Ding Y, Dong C, Dong J, Dong L Y, Dong M Y, Dou Z L, Du S X, Duan P F, Fan J Z, Fang J, Fang S S, Fang Y, Farinelli R, Fava L, Feldbauer F, Felici G, Feng C Q, Fritsch M, Fu C D, Gao Q, Gao X L, Gao Y, Gao Y G, Gao Z, Garillon B, Garzia I, Gilman A, Goetzen K, Gong L, Gong W X, Gradl W, Greco M, Gu L M, Gu M H, Gu Y T, Guo A Q, Guo L B, Guo R P, Guo Y P, Guskov A, Haddadi Z, Han S, Hao X Q, Harris F A, He K L, Heinsius F H, Held T, Heng Y K, Hou Z L, Hu H M, Hu J F, Hu T, Hu Y, Huang G S, Huang J S, Huang X T, Huang X Z, Huang Z L, Hussain T, Ikegami Andersson W, Imoehl W, Irshad M, Ji Q, Ji Q P, Ji X B, Ji X L, Jiang H L, Jiang X S, Jiang X Y, Jiao J B, Jiao Z, Jin D P, Jin S, Jin Y, Johansson T, Kalantar-Nayestanaki N, Kang X S, Kavatsyuk M, Ke B C, Keshk I K, Khan T, Khoukaz A, Kiese P, Kiuchi R, Kliemt R, Koch L, Kolcu O B, Kopf B, Kuemmel M, Kuessner M, Kupsc A, Kurth M, Kühn W, Lange J S, Larin P, Lavezzi L, Leiber S, Leithoff H, Li 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, Liang H, Liang Y F, Liang Y T, Liao G R, Liao L Z, Libby J, Lin C X, Lin D X, Liu 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, Long Y F, Lou X C, Lu H J, Lu J G, Lu Y, Lu Y P, Luo C L, Luo M X, Luo P W, Luo T, Luo X L, Lusso S, Lyu X R, Ma F C, Ma H L, Ma L L, Ma M M, Ma Q M, Ma X N, Ma X Y, Ma Y M, Maas F E, Maggiora M, Maldaner S, Malik Q A, Mangoni A, Mao Y J, Mao Z P, Marcello S, Meng Z X, Messchendorp J G, Mezzadri G, Min J, Min T J, Mitchell R E, Mo X H, Mo Y J, Morales C Morales, Muchnoi N Yu, Muramatsu H, Mustafa A, Nakhoul S, Nefedov Y, Nerling F, Nikolaev I B, Ning Z, Nisar S, Niu S L, Niu X Y, Olsen S L, Ouyang Q, Pacetti S, Pan Y, Papenbrock M, Patteri P, Pelizaeus M, Pellegrino J, Peng H P, Peng Z Y, Peters K, Pettersson J, Ping J L, Ping R G, Pitka A, Poling R, Prasad V, Qi H R, Qi M, Qi T Y, Qian S, Qiao C F, Qin N, Qin X S, Qin Z H, Qiu J F, Qu S Q, Rashid K H, Redmer C F, Richter M, Ripka M, Rivetti A, Rolo M, Rong G, Rosner Ch, Sarantsev A, Savrié M, Schoenning K, Shan W, Shan X Y, Shao M, Shen C P, Shen P X, Shen X Y, Sheng H Y, Shi X, Song J J, Song W M, Song X Y, Sosio S, Sowa C, Spataro S, Sui F F, Sun 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, Tan Y T, Tang C J, Tang G Y, Tang X, Tiemens M, Tsednee B, Uman I, Wang 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, Weber T, Wei D H, Weidenkaff P, Wen S P, Wiedner U, Wolke M, Wu L H, Wu L J, Wu Z, Xia L, Xia X, Xia Y, Xiao D, Xiao Y J, Xiao Z J, Xie Y G, Xie Y H, Xiong X A, Xiu Q L, Xu G F, Xu J J, Xu L, Xu Q J, Xu X P, Yan F, Yan L, Yan W B, Yan W C, Yan Y H, Yang H J, Yang H X, Yang L, Yang R X, Yang S L, Yang Y H, Yang Y X, Yang Yifan, Yang Z Q, Ye M, Ye M H, Yin J H, You Z Y, Yu B X, Yu C X, Yu J S, Yuan C Z, Yuan Y, Yuncu A, Zafar A A, Zeng Y, Zhang 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, Zhao 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, Zhemchugov A, Zheng B, Zheng J P, Zheng W J, Zheng Y H, Zhong B, Zhou L, Zhou Q, Zhou X, Zhou X K, Zhou X R, Zhou X Y, Zhou Xiaoyu, Zhou Xu, Zhu A N, Zhu J, Zhu J, Zhu K, Zhu K J, Zhu S, Zhu S H, Zhu X L, Zhu Y C, Zhu Y S, Zhu Z A, Zhuang J, Zou B S, Zou J H
Institute of High Energy Physics, Beijing 100049, People's Republic of China.
G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
Phys Rev Lett. 2019 Apr 12;122(14):142002. doi: 10.1103/PhysRevLett.122.142002.
Based on a sample of (1310.6±7.0)×10^{6}J/ψ events collected with the BESIII detector, we present measurements of J/ψ and η^{'} absolute branching fractions using the process J/ψ→γη^{'}. By analyzing events where the radiative photon converts into an e^{+}e^{-} pair, the branching fraction for J/ψ→γη^{'} is measured to be (5.27±0.03±0.05)×10^{-3}. The absolute branching fractions of the five dominant decay channels of the η^{'} are then measured for the first time and are determined to be B(η^{'}→γπ^{+}π^{-})=(29.90±0.03±0.55)%, B(η^{'}→ηπ^{+}π^{-})=(41.24±0.08±1.24)%, B(η^{'}→ηπ^{0}π^{0})=(21.36±0.10±0.92)%, B(η^{'}→γω)=(2.489±0.018±0.074)%, and B(η^{'}→γγ)=(2.331±0.012±0.035)%, where the first uncertainties are statistical and the second systematic.
基于北京谱仪III（BESIII）探测器收集的(1310.6±7.0)×10⁶个J/ψ事例样本，我们利用J/ψ→γη′过程给出了J/ψ和η′绝对分支比的测量结果。通过分析辐射光子转化为e⁺e⁻对的事例，测得J/ψ→γη′的分支比为(5.27±0.03±0.05)×10⁻³。首次测量了η′五个主要衰变道的绝对分支比，其值分别为：B(η′→γπ⁺π⁻)=(29.90±0.03±0.55)%，B(η′→ηπ⁺π⁻)=(41.24±0.08±1.24)%，B(η′→ηπ⁰π⁰)=(21.36±0.10±0.92)%，B(η′→γω)=(2.489±0.018±0.074)%，B(η′→γγ)=(2.331±0.012±0.035)%，其中第一个不确定度为统计不确定度，第二个为系统不确定度。
