Search for sleptons in e+e- collisions at centre-of-mass energies up to 184 GeV ALEPH Collaboration

Sezione di Milano Istituto Nazionale di Fisica Nucleare
Sezione di Bari Istituto Nazionale di Fisica Nucleare
Service de Physique des Particules
Santa Cruz Institute for Particle Physics
Laboratoire de l'Accélérateur Linéaire
Johannes Gutenberg Universität Mainz
Università di Pisa
Institute of High Energy Physics Chinese Academy of Science
Los Angeles University of California
IN2P3 Institut National de Physique Nucleaire et de Physique des Particules
Universität Siegen
Lancaster University
Universitat Autònoma de Barcelona
Rutherford Appleton Laboratory
Royal Holloway University of London
Università degli Studi di Firenze
Université de la Méditerranée Aix-Marseille II
European Organization for Nuclear Research
Università degli Studi di Trieste
University of Wisconsin System

Abstract

The data collected by the ALEPH experiment at LEP at centre–of–mass energies around 183 GeV are analysed to search for sleptons, the partners of leptons in supersymmetric theories. The previously published search for acoplanar leptons and missing energy has been updated. New searches have been developed to cover a wider range of slepton signals. These include single electrons, acoplanar leptons accompanied by two photons plus missing energy as well as particles with lifetime. No evidence for the production of any such particles is found. Slepton mass limits are reported within gravity mediated and gauge mediated SUSY breaking scenarios.