A SEARCH FOR SCALAR LEPTOQUARKS IN Z0 DECAYS

被引：59

作者：

ALEXANDER, G

机构：

[1] Department of Physics and Astronomy, Tel Aviv University, Tel Aviv

[2] Department of Physics, Schuster Laboratory, The University, Manchester

[3] Cavendish Laboratory, Cambridge

[4] Enrico Fermi Institute, Department of Physics, University of Chicago, Chicago

[5] Dipartimento di Fisica dell'Unniversità di Bologna, INFN

[6] Department of Physics, Carleton University, Colonel By Drive, Ottawa

[7] Laboratoire de Physique Nucléaire, Université de Montreal, Montreal

[8] Department of Physics and Astronomy, University of Maryland, College Park

[9] Queen Mary and Westfield College, University of London, London

[10] Fakultät für Physik, Albert Ludwigs Universität

[11] CERN, European Organisation for Particle Physics

[12] Rutherford Appleton Laboratory, Chilton, Didcot

[13] Physikalisches Institut, Universität Heidelberg

[14] Physikalisches Institut, Universität Bonn

[15] School of Physics and Space Research, University of Birmingham, Birmingham

[16] Department of Physics, Indiana University, Swain Hall West 117, Bloomington

[17] Brunel University, Uxbridge

[18] University College London, London

[19] Department of Physics, Technion - Israel Institute of Technology, Haifa

[20] Birkbeck College, London

[21] DPhPE, CEN-Saclay

[22] Department of Physics, University of California, Riverside

[23] Centre for Research in Particle Physics, Carleton University, Ottawa

[24] Nuclear Physics Department, Weizmann Institute of Science, Rehovot

[25] International Center for Elementary Particle Physics University of Tokyo, Tokyo

[26] Department of Physics, Kobe University, Kobe

[27] National Research Council of Canada, Herzberg Institute of Astrophysics, Ottawa

来源：

PHYSICS LETTERS B | 1991年 / 263卷 / 01期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

LUND MONTE-CARLO; JET FRAGMENTATION; E+E-PHYSICS;

D O I：

10.1016/0370-2693(91)91717-A

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for scalar leptoquarks has been performed with data from the OPAL detector at the e+e- storage ring LEP. In a data sample corresponding to an integrated luminosity of 6.3 pb-1 no evidence for leptoquark production was observed where the leptoquark decays into a quark and either a charged lepton (e, mu, tau) or a neutrino. An upper limit of 1.7 pb on the production cross section for leptoquarks is obtained assuming a branching ratio of 50% for the decay of the leptoquark into the channels with a charged lepton. Lower limits on the leptoquark mass between 41.4 and 46.4 GeV/c2 at 95% CL are obtained, depending on the effective SU (2) x U (1) invariant couplings assigned to the leptoquark.

引用

页码：123 / 134

页数：12

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