Measurement Of Michel Parameter In Tau Decay

JZ Bai,JG Bian,ZW Chai,GP Chen,HF Chen,JC Chen,YQ Chen,Y Chen,YB Chen,BS Cheng,XZ Cui,HL Ding,LY Dong,ZZ Du,S Feng,CS Gao,ML Gao,SQ Gao,JH Gu,SD Gu,WX Gu,YF Gu,YN Guo,SW Han,Y Han,JT He,J He,M He,GY Hu, HM Hu,JL Hu,QH Hu,T Hu,XQ Hu,JD Huang,YZ Huang,CH Jiang,Y Jin,ZJ Ke,YF Lai,PF Lang,CG Li, D Li,HB Li,J Li,PQ Li,RB Li,W Li,WD Li,WG Li,XH Li,XN Li,HM Liu,J Liu,JH Liu,RG Liu,Y Liu,F Lu,JG Lu,JY Lu,LC Lu,CH Luo,AM Ma,EC Ma,JM Ma,HS Mao,ZP Mao,XC Meng, J Nie,ND Qi,XR Qi,CD Qian,JF Qiu,YH Qu,YK Que,G Rong,YY Shao,BW Shen,DL Shen,H Shen,XY Shen,HY Sheng,HZ Shi,XF Song,F Sun,HS Sun,SQ Tang,GL Tong,F Wang,LS Wang,LZ Wang,M Wang,PL Wang,P Wang,SM Wang,TJ Wang,YY Wang,CL Wei,YG Wu,DM Xi,XM Xia,PP Xie,Y Xie,YH Xie,WJ Xiong,CC Xu,GF Xu, MK Xu,YD Xu,ST Xue,J Yan,WG Yan,CY Yang,CM Yang,J Yang,XF Yang,MH Ye, QH Ye,SW Ye,YX Ye,K Yi,CS Yu,CX Yu,GW Yu,YH Yu,ZT Yu,ZQ Yu,CZ Yuan, Y Yuan,BY Zhang,CC Zhang,DH Zhang,HL Zhang,J Zhang,JW Zhang,JL Zhang,LS Zhang,QJ Zhang,SQ Zhang,XY Zhang, Y Zhang,YY Zhang,DX Zhao,HW Zhao,JW Zhao,M Zhao,WR Zhao,JP Zheng,LS Zheng, ZP Zheng,GP Zhou,HS Zhou,L Zhou,QM Zhu,HG Zhu,YC Zhu,YS Zhu,B Zhuang

HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION（1998）

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摘要

We have analysed the e(+)e(-) collision data collected with Beijing Spectrometer at the center-of-mass energy 4.03 GeV and selected e(+)e(-) --> tau(+/-)tau(-/+) e(+/-)X(-/+) nu's events, X+/- required as mu(+/-), pi(+/-) and rho(+/-). From fitting electron energy spectrum in tau --> e nu's decay, the measurement value of Michel parameter is given as rho(tau --> e) 0.705(-0.054-0.026)(+0.055+0.027), this result is in good agreement with the prediction of standard Model.

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关键词

Beijing Spectrometer, electron energy spectrum in tau decay, Michel parameter, nature of weak vertex

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