Eur. Phys. J. C 25, 339-351 (2002)
Search for gauge mediated SUSY breaking topologies in e +e - collisions at centre-of-mass energies up to 209 GeVThe ALEPH Collaboration
( Received: 14 March 2002 / Published online: 20 September 2002 )
A total of 628 of data collected with the ALEPH detector at centre-of-mass energies from 189 to 209 GeV is analysed in the search for gauge mediated SUSY breaking (GMSB) topologies. These topologies include two acoplanar photons, non-pointing single photons, acoplanar leptons, large impact parameter leptons, detached slepton decay vertices, heavy stable charged sleptons and multi-leptons plus missing energy final states. No evidence is found for new phenomena, and lower limits on masses of supersymmetric particles are derived. A scan of a minimal GMSB parameter space is performed and lower limits are set for the next-to-lightest supersymmetric particle (NLSP) mass at 54 and for the mass scale parameter at 10 , independently of the NLSP lifetime. Including the results from the neutral Higgs boson searches, a NLSP mass limit of 77 is obtained and values of up to 16 are excluded.
© Società Italiana di Fisica, Springer-Verlag 2002