Searches for GMSB at √s = 189 GeV at LEP

Searches for Gauge Mediated Supersymmetry Breaking topologies are performed on 170 pb−1 of data collected at a centre of mass energy of 188.6 GeV by each of the four LEP experiments. No evidence for such processes is found, allowing 95% C.L. lower limits to be set on the masses of various particles in the context of GMSB. In particular, it is found that the lightest neutralino must be heavier that 90 GeV/c2, the right-handed stau must be heavier than 76 GeV/c2 and the gravitino must be heavier than 1.1 × 10−5 eV/c2.