MEASUREMENTS OF Z0-]BBARB DECAYS AND THE SEMILEPTONIC BRANCHING RATIO BR(B-]L+X)

被引：84

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] Central Laboratory of Automation and Instrumentation, CLANP, Sofia

[11] INFN - Sezione di Bologna

[12] Institute of Theoretical and Experimental Physics, ITEP

[13] University of Michigan, Ann Arbor

[14] Tata Institute of Fundamental Research, Bombay

[15] INFN - Sezione di Roma, University of Rome La Sapiena

[16] Princeton University, Princeton

[17] University of Alabama, Tuscaloosa

[18] University of Geneva

[19] Laboratoire de Physique des Particules, LAPP

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

[21] National Institute for High Energy Physics, NIKHEF

[22] NIKHEF-H, University of Nijmegen

[23] University of California, San Diego

[24] Carnegie Mellon University, Pittsburgh

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

[26] Purdue University, West Lafayette

[27] Lawrence Livermore National Laboratory, Livermore

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

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

[30] Oak Ridge National Laboratory, Oak Ridge

[31] Paul Scherrer Institut (PSI), Würenlingen

[32] Shanghai Institute of Ceramics, SIC, Shanghai

[33] University of Lausanne

[34] California Institute of Technology, Pasadena

[35] Los Alamos National Laboratory, Los Alamos

[36] Harvard University, Cambridge

[37] Union College, Schenectady

[38] University of Hamburg

来源：

PHYSICS LETTERS B | 1991年 / 261卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(91)91347-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have measured the decay properties of Z0 --> bbBAR from a study of inclusive muon and electron events. The average (e and mu) b-quark semileptonic branching ratio has been determined to be BR (b --> l + X) = 0.119 +/- 0.003 (stat.) +/- 0.006 (syst.), assuming the standard model prediction of GAMMA-bbBAR = 378 +/- 3 MeV. From the ratio of the number of dilepton events to single lepton events, we find BR (b --> l + X) = 0.113 +/- 0.010 (stat.) +/- 0.006 (syst.), without assumptions on GAMMA-bbBAR. The partial decay width of the Z0 into bbBAR has been measured to be GAMMA-bbBAR = 385 +/- 7 (stat.) +/- 11 (syst.) MeV with an additional 19 MeV error from the uncertainty in BR (b --> l + X). The average fractional energy of bottom hadrons in Z0 --> bbBAR events has been determined to be <X(E)> = 0.686 +/- 0.006 (stat.) +/- 0.016 (syst.).

引用

页码：177 / 187

页数：11

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