Searches for topologies characteristic of Gauge
Mediated SUSY Breaking models (GMSB) are performed
by analysing 173.6 pb-1 of
data collected at  s
= 188.6GeV with the ALEPH detector. These
topologies include acoplanar photons, non-pointing single photon, acoplanar
leptons, large impact parameter leptons,
detached slepton decay vertices, heavy stable charged sleptons and four leptons
plus missing energy final states. No evidence for these new phenomena is
observed and limits on production cross
sections and sparticle masses are derived. A scan of a minimal GMSB parameter
space is performed and model dependent lower limits
of about 45 GeV/c2
on the next-to-lightest supersymmetric
particle (NLSP) mass and of about 9TeV on the mass scale parameter [lamda] are
derived, independently of the NLSP lifetime.
|
