η'衰变分支比的精确测量。

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

作者信息

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

机构信息

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.

出版信息

Phys Rev Lett. 2019 Apr 12;122(14):142002. doi: 10.1103/PhysRevLett.122.142002.

DOI:10.1103/PhysRevLett.122.142002

PMID:31050481

Abstract

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.

摘要

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。