DECAY PROPERTIES OF TAU-LEPTONS MEASURED AT THE Z0 RESONANCE

被引：30

作者：

ADEVA, B

机构：

[1] European Laboratory for Particle Physics, CERN

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

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

[4] Johns Hopkins University, Baltimore

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

[6] Northeastern University, Boston

[7] INFN - Sezione di Perugia, Universitá Degli Studi di Perugia

[8] World Laboratory, FBLJA Project

[9] Eidgenössische Technische Hochschule, ETH Zürich

[10] Massachusetts Institute of Technology, Cambridge

[11] Leningrad Nuclear Physics Institute

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

[13] INFN - Sezione di Bologna

[14] Institute of Theoretical and Experimental Physics, ITEP

[15] University of Michigan, Ann Arbor

[16] Tata Institute of Fundamental Research, Bombay

[17] INFN - Sezione di Roma, University of Rome La Sapeinza

[18] Princeton University, Princeton

[19] University of Alabama, Tuscaloosa

[20] University of Geneva

[21] Laboratoire de Physique des Particules, LAPP

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

[23] I. Physikalisches Institut, RWTH, W-5100 Aachen, FRG1 1 Supported by the German Bundesministerium für Forschung und Technologie. and III. Physikalisches Institut, RWTH

[24] National Institute for High Energy Physics, NIKHEF

[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] Lawrence Livermore National Laboratory, Livermore

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

[31] University of Science and Technology of China, Hefei, 029

[32] Oak Ridge National Laboratory, Oak Ridge

[33] University of Nijmegen, NIKHEF

[34] Paul Scherrer Institut (PSI), Würenlingen

[35] Shanghai Institute of Ceramics, SIC, Shanghai

[36] University of Laussane

[37] California Institute of Technology, Pasadena

[38] Los Alamos National Laboratory, Los Alamos

[39] Harvard University, Cambridge

[40] Union College, Schenectady

[41] University of Hamburg

来源：

PHYSICS LETTERS B | 1991年 / 265卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(91)90081-Z

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

From 2540 Z0 --> tau+tau- events, we determine the inclusive decay branching fractions of the tau-lepton into one and three charged particles to be 0.856 +/- 0.006 (stat.) +/- 0.003 (syst.) and 0.144 +/- 0.006 (stat.) +/- 0.003 (syst.), respectively. The leptonic branching fractions are measured to be 0.175 +/- 0.008 (stat.) +/- 0.005 (syst.) for tau --> mu-nu-mu-nu-tau and 0.177 +/- 0.007 (stat.) +/- 0.006 (syst.) for tau --> e-nu-e-nu-tau. We determine the tau-lifetime both from three-prong decays using the decay length and from one-prong decays using the impact parameter. The results from the two independent methods agree and yield a combined value of [0.309 +/- 0.023 (stat.) +/- 0.030 (syst.)] x 10(-12)s.

引用

页码：451 / 461

页数：11

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