First Measurement of the Branching Fraction of the Decay psi(2S) --> tau tau

J. Z. Bai,Y Ban,J G Bian,I K Blum,G P Chen,H F Chen, Jianing Chen, Chen Jia Chao, Yuan Qing Chen, Cheng Bao Sen,X Z Cui,H L Ding,L Y Dong,Z Z Du,W Dunwoodie,C S Gao,M L Gao,S Q Gao,P Gratton,J H Gu,S D Gu,W X Gu,Y F Gu,Z J Guo,Y N Guo,S W Han,Ying Han,F A Harris,J T He,K L He,Mingyi He,Y K Heng,D G Hitlin,G Y Hu,H M Hu,J L Hu,Q H Hu, Tianduo Hu, Hu Xiao Qing,G S Huang,Y Z Huang,J M Izen,C H Jiang,Ying Jin,B D Jones,Xiangyang Ju,Z J Ke,M H Kelsey,B K Kim,Decong Kong,Y F Lai,P F Lang,A J Lankford,C G Li,Dongsheng Li, H B Li,J C Li,P Q Li, Ren Bing Li,W G Li,X H Li,Li Nan,H M Liu, Jie Liu,R G Liu, Yabo Liu,X C Lou, Brian S Lowery,F Lu,J G Lu,X L Luo,E C Ma,J M Ma,R Malchow,H S Mao,Z P Mao,X C Meng,J Nie,S L Olsen,J Oyang,D Paluselli,L J Pan,J Panetta,F C Porter,N D Qi,X R Qi,C D Qian,J F Qiu,Y H Qu,Y K Que,G Rong,M Schernau,Y Y Shao,B W Shen,D L Shen,H Shen,X Y Shen,H Y Sheng,H Z Shi,X F Song,J Standifird, Fazhe Sun,H S Sun,Y Z Sun,S Q Tang,W H Toki,G L Tong,G Varner,Fen Wang,L Z Wang,M Wang,P L Wang,S M Wang,Thomas J Wang,Yuan Yu Wang,M Weaver,C L Wei,J M Wu,N Wu,Y G Wu,D M Xi,X M Xia,P P Xie, Yan Hong Xie,G F Xu,S T Xue,Jianbing Yan,W G Yan,C Y Yang,H X Yang, Jinliang Yang, Weiguo Yang,Xiao Feng Yang,M H Ye,Ye Shu Wei,Y X Ye,C S Yu,G W Yu, Y Hei,Z Q Yu,C Z Yuan,Yuan Yuan,Zhang Bing Yun,C C Zhang,Dong H Zhang,H L Zhang,J W Zhang,L S Zhang,Peng Zhang,Q J Zhang,S Q Zhang,Xiang Yang Zhang,Y Y Zhang,D X Zhao,H W Zhao,Zhao Jia Wei,Mengqiang Zhao, Zhao Wei Ren,Z G Zhao,Zheng Jian Ping, Zheng Lin Sheng, Zheng Zhi Peng,B Q Zhou,G P Zhou,H S Zhou,Liqun Zhou,K J Zhu,Q M Zhu,Y C Zhu,B A Zhuang

PHYSICAL REVIEW D（2002）

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摘要

The branching fraction of the psi(2S) decay into tau(+) tau(-) has been measured for the first time using the BES detector at the Beijing Electron-Positron Collider. The result is B-tautau =(2.71+/-0.43+/-0.55) x 10(-3), where the first error is statistical and the second is systematic. This value, along with those for the branching fractions into e(+)c(-) and mu(+)mu(-) of this resonance, satisfy well the relation predicted by the sequential lepton hypothesis. Combining all these values with the leptonic width of the resonance, the total width of the psi(2S) is determined to be (252+/-37) keV.

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