Search for sleptons in e+e− collisions at centre–of–mass energies up to 184 GeV

Abstract The data collected by the ALEPH experimentat LEP at centre–of–mass energies around 183 GeV are analysed to search for sleptons, the partners of leptonsin supersymmetric theories. The previously published search for acoplanar leptonsand missing energyhas been updated. New searches have been developed to cover a wider range of slepton signals. These include single electrons, acoplanar leptonsaccompanied by two photons plus missing energyas 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.