Precision measurements of B [ ψ ( 3686 ) → π + π − J / ψ ] and B [ J / ψ → l + l − ]

F E Maas,X Y Ma,Teng Ma,S Ma,Q M Ma,H L Ma,F C Ma,Mingming Lv,X L Luo,T Luo,M X Luo,C L Luo,Y P Lu,X R Lu,J G Lu, H J Lu,G R Lu,X C Lou,H Loehner,Z A Liu,Y B Liu, Xing Liu,S B Liu,Qiong Liu, P L Liu, K Y Liu,J P Liu,H M Liu, F H Liu, C L Liu, B J Liu,D X Lin,X T Liao,G R Liao,Y F Liang,H Liang,Z B Li, X L Li,W D Li,Q J Li,Lei Li,Kuanching Li,J C Li,H B Li,Ge Li,Feng Li,D M Li, C H Li,M Leyhe,P Larin,M Lara, J S Lange,W Lai,W Kuehn,M Kornicer, B Kopf, B Kloss,M Kavatsyuk,N Kalantarnayestanaki, F F Jing, S Jin,D P Jin,Z Jiao,J B Jiao, X S Jiang, L L Jiang,X L Ji,Q P Ji,C S Ji,T Hussain, Y Huang,X T Huang, Liliang Huang, J S Huang, G M Huang, T Hu,J F Hu,H M Hu,C Hu, Z L Hou,Y K Heng,T Held,Z Y He,Min He,K L He,F A Harris,Y L Han,Y P Guo,T Guo,L B Guo,A Q Guo,Y H Guan,Y T Gu,M H Gu,M Greco,W Gradl,W X Gong,K Goetzen, C Geng,Y Gao,O Fuks,J L Fu, C D Fu,P Friedel,C Q Feng, L Fava, S S Fang,Jiayuan Fang,S X Du,M Y Dong,L Y Dong,Yifu Ding,W M Ding,M Destefanis,I Denysenko,A G Denig, Z Y Deng,D V Dedovich,J P Dai, H L Dai, D Croninhennessy,Y P Chu,H P Cheng,Y B Chen,X R Chen,S J Chen,M L Chen,J C Chen,H S Chen, G Chen, G A Chelkov, J F Chang, S A Cetin,G F Cao,A Calcaterra,O Cakir,Xu Cai,Hui Cai, V Bytev,R A Briere,S Braun, I Boyko,O Bondarenko,E Boger,J M Bian, M Bertani,J V Bennett, Jorg D Becker, Y Ban,R Baldini Ferroli, J Z Bai,Q An,F F An,D Ambrose,O Albayrak,M N Achasov,M Ablikim, J L Ping,K Peters,H P Peng,M Pelizaeus, J W Park,S Pacetti,Qun Ouyang,S L Olsen,Zhen Ning,I B Nikolaev,Y Nefedov,H Muramatsu,N Yu Muchnoi,K Moriya,C Morales Morales,H Moeini,X H Mo,R E Mitchell,T J Min,J Min,J G Messchendorp,Z P Mao,Y J Mao,Q A Malik,M Maggiora,J H Zou,B S Zou,Jia Zhuang,Z A Zhu,Y C Zhu, X L Zhu, S H Zhu, K J Zhu,C Zhu,X K Zhou,Liwei Zhou,B Zhong, Y H Zheng,J P Zheng,Baihua Zheng,A Zhemchugov,Z G Zhao,Y B Zhao,X H Zhao,T C Zhao,S J Zhao,Qi Zhao,M G Zhao,Ling Zhao,J W Zhao,H S Zhao,G Zhao,Z Y Zhang,Y H Zhang,Xiao Jing Zhang,S H Zhang,Rong Zhang,Lili Zhang,Jian Qiang Zhang,H Y Zhang,D H Zhang,C C Zhang,B Y Zhang,Yong Zeng,S L Zang, A Zallo,A A Zafar,Yanzhi Yuan,C Z Yuan, S P Yu, J S Yu,H W Yu,C X Yu,B X Yu,M H Ye,H Ye,Y X Yang,H X Yang, Y H Yan,W B Yan, L Yan,Z Xue, Z R Xu,X P Xu, Q N Xu,G F Xu,Q L Xiu,Y G Xie,Z J Xiao,Y X Xia,L G Xia,Zhonghong Wu,Wei Wu,S X Wu,N Wu,L H Wu,U Wiedner,M Werner,S P Wen,Q G Wen,P Weidenkaff, J B Wei,D H Wei, Z Y Wang, Y D Wang, X F Wang, S G Wang,Q J Wang,P L Wang,Mozhen Wang,L L Wang,Kai Wang, D Y Wang,Baolin Wang, G Varner, I Uman,M Ullrich,D Toth, E H Thorndike,I Tapan,Xiaoliang Tang,C J Tang,Z J Sun,Y Z Sun,S S Sun,J F Sun,G X Sun,D H Sun,B Spruck,S Spataro,X Y Song,W M Song,M R Shepherd, H Y Sheng, X Y Shen, C P Shen,M Shao,A V Sarantsev,X D Ruan,G Rong, C F Redmer,K H Rashid, J F Qiu,Z H Qin,Yang Qin, X S Qin,L Q Qin,C F Qiao,Sijin Qian, M Qi,E Prencipe,R Poling,R G Ping

Physical Review D（2013）

引用 7|浏览196

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摘要

Based on (106.41 +/- 0.86) x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider, the branching fractions of psi(3686) -> pi(+)pi(-)J/psi, J/psi -> e(+)e(-), and J/psi -> mu(+)mu(-) are measured. We obtain B[psi(3686) -> pi(+)pi(-)J/psi] = (34.98 +/- 0.02 +/- 0.45)%, B[J/psi -> e(+)e(-)] = (5.983 +/- 0.007 +/- 0.037)%, and B[J/psi -> mu(+)mu(-)] = (5.973 +/- 0.0007 +/- 0.038)%. The measurement of B[psi(3686) -> pi(+)pi(-)J/psi] confirms the CLEO-c measurement, and is apparently larger than the others. The measured J/psi leptonic decay branching fractions agree with previous experiments within one standard deviation. These results lead to B[J/psi -> l(+)l(-)] = (5.978 +/- 0.005 +/- 0.040)% by averaging over the e(+)e(-) and mu(+)mu(-) channels and a ratio of B[J/psi -> e(+)e(-)]/B[J/psi -> mu(+)mu(-)] = 1.0017 +/- 0.0017 +/- 0.0033, which tests e- mu universality at the four tenths of a percent level. All the measurements presented in this paper are the most precise in the world to date.

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关键词

Quarkonium,Pi,Physics,Nuclear physics,Electron–positron annihilation,Collider,Branching (version control),Analytical chemistry

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