A DETERMINATION OF ELECTROWEAK PARAMETERS FROM Z-DECAYS INTO CHARGED LEPTONS

被引：18

作者：

ADEVA, B

机构：

[1] European Laboratory for Particle Physics, CERN

[2] INFN-Sezione di Firenze, University of Florence

[3] Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, CIEMAT

[4] Johns Hopkins University, MDltimore

[5] INFN-Sezione di Napoli, University of Naples

[6] Northeastern University, Boston

[7] World Laboratory, FBLJA Project

[8] Eidgenössische Technische Hochschule, ETH Zürich

[9] Massachusetts Institute of Technology, Cambridge

[10] Leningrad Nuclear Physics Institute

[11] Central Laboratory of Automation and Instrumentation, CLANP, Sofia

[12] INFN-Sezione di Bologna

[13] Institute of Theoretical and Experimental Physics, ITEP

[14] University of Michigan, Ann Arbor

[15] Tata Institute of Fundamental Research, Bombay

[16] INFN-Sezione di Roma, University of Rome La Sapienza

[17] Princeton University, Princeton

[18] Union College, Schenectady

[19] University of Geneva

[20] Laboratoire de Physique des Particules, LAPP

[21] Central Research Institute for Physics, the Hungarian Academy of Sciences

[22] National Institute for High Energy Physics, NIKHEF

[23] Paul Scherrer Institut (PSI), Würenlingen

[24] University of Lausanne

[25] University of California, San Diego

[26] Carnegie Mellon University, Pittsburgh

[27] Institut de Physique Nucléaire de Lyon, IN2P3-CNRS/Université Claude Bernard

[28] Purdue University, West Lafayette

[29] University of Alabama, Tuscaloosa

[30] Institute of High Energy Physics, IHEP, Beijing

[31] California Institute of Technology, Pasadena

[32] High Energy Physics Institute, Berlin

[33] Shanghai Institute of Ceramics, SIC, Shanghai

[34] Harvard University, Cambridge

[35] University of Hamburg

来源：

PHYSICS LETTERS B | 1990年 / 250卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(90)91175-B

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have measured the partial widths for the three reactions e+e- → Z0 → e+e-, μ+μ-, τ+τ-. The results are Γee = 84.3±1.3 MeV, √ΓeeΓμμ=83.9±1.4 MeV, and √ΓeeΓττ=83.9±1.4 MeV, where the errors are statistical. The systematic errors are estimated to be 1.0 MeV, 0.9 MeV, and 1.4 MeV, respectively. We perform a simultaneous fit to the cross sections for the e+e-→e+e-, μ+μ-, and τ+τ- data, the differential cross section as a function of polar angle for the electron data, and the forward- backward asymmetry for the muon data. We obtain the leptonic partial with Γℓℓ=84.0±0.9 (stat.) MeV. The systematic error is estimated to be 0.8 MeV. Also, we obtain the axial-vector and vector weak coupling constants of charged leptons, gA=-0.500±0.003 and gν=-0.064-0.013 +0.017. © 1990.

引用

页码：183 / 192

页数：10

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