GMSB Susy Searches at LEP

The topologies predicted by the Supersymmetric models with Gauge Mediated SUSY Break­ ing are object of dedicated searches performed by the LEP experiments analyzing the data collected up to a centre-of-mass energy of 202 GeV. These topologies include acoplanar pho­ tons, non-pointing single photon, acoplanar leptons, leptons with large impact parameter, detached decay vertices, heavy stable charged particles and four leptons plus missing energy final state. No excess of candidate events is observed and lower limits on production cross sections and sparticle masses are set. The ALEPH experiment performed also a scan based on the 189 GeV results which allows to derive model dependent limits within a minimal GMSB model.