A PRECISION-MEASUREMENT OF THE NUMBER OF NEUTRINO SPECIES

被引：28

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] 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] I. Physikalisches Institut, RWTH

[23] III. Physikalisches Institut, RWTH

[24] National Institute for High Energy Physics, NIKHEF

[25] NIKHEF-H, University of Nijmegen

[26] Paul Scherrer Institut (PSI), Würenlingen

[27] University of Lausanne

[28] University of California, San Diego

[29] Carnegie Mellon University, Pittsburgh

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

[31] Purdue University, West Lafayette

[32] University of Alabama, Tuscaloosa

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

[34] High Energy Physics Institute, Berlin

[35] California Institute of Technology, Pasadena

[36] Shanghai Institute of Ceramics, SIC, Shanghai

[37] Harvard University, Cambridge

[38] University of Hamburg

来源：

PHYSICS LETTERS B | 1990年 / 249卷 / 02期

关键词：

D O I：

10.1016/0370-2693(90)91267-F

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have measured the cross section for e+e-→hadrons over the center of mass energy range of the Z0 peak, from 88.22 to 95.03 GeV. We determine the Z0 mass Mz=91.164±0.013 (experiment) ±0.030 (LEP) GeV. Within the framework of the standard model we determine the invisible width, Γinvisible=0.502±0.018 GeV, and the number of light neutrino species, Nν=3.01±0.11. We exclude the existence of a supersymmetric scalar neutrino having a mass less than 31.4 GeV, at the 95% confidence level. We performed a model independent combined fit to the e+e-→hadrons and e+e-→μ+μ- data to determine total width, leptonic width and hadronic width of the Z0. © 1990.

引用

页码：341 / 352

页数：12

共 46 条

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