SEARCH FOR PAIR PRODUCED STABLE SINGLY CHARGED HEAVY-PARTICLES IN Z0 DECAYS

被引：13

作者：

AKRAWY, MZ

机构：

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

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

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

[4] Cavendish Laboratory, Cambridge

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

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

[7] Rutherford Appleton Laboratory, Chilton, Didcot

[8] Laboratoire de Physique Nucléaire, Université de Montréal, Montreal

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

[10] Fakultät für Physik, Albert Ludwigs Universität

[11] CERN, European Organisation for Particle Physics

[12] Physikalisches Institut, Universität Heidelberg

[13] Physikalisches Institut, Universität Bonn

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

[15] Dipartimento di Fisica dell' Università di Bologna, INFN

[16] Brunel University, Uxbridge

[17] University College London, London

[18] Birkbeck College, London

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

[20] DPhPE, CEN Saclay

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

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

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

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

[25] Kobe University, Kobe

来源：

PHYSICS LETTERS B | 1990年 / 252卷 / 02期

关键词：

D O I：

10.1016/0370-2693(90)90875-7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A direct search for the exclusive pair production of stable singly charged heavy (SCH) particles in Z0 decays at the LEP e+ e- collider is presented. In a scan around the Z0 resonance of 0.4 pb-1 integrated luminosity, no evidence is seen for the production of slow-moving charged particles as measured by their time-of-flight. We set an upper limit of 1 X 10(-3) on the Z0 branching ratio into a pair of SCH fermions in the mass range 29-40 GeV/c2, corresponding to a 3 MeV upper limit on such a contribution to the total width of the Z0. We exclude a fourth generation SCH lepton in the mass range 18.5-42.8 GeV/c2. We also exclude a stable supersymmetric partner of the right-handed lepton, l approximately R, in the mass range 21.5-38.8 GeV/c2. All limits are at 95% confidence level.

引用

页码：290 / 300

页数：11

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