Search For Gauge Mediated Susy Breaking Topologies At Root S Similar To 189 Gev

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EUROPEAN PHYSICAL JOURNAL C（2000）

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摘要

Searches for topologies characteristic of Gauge Mediated SUSY Breaking models (GMSB) are performed by analysing 173.6 pb(-1) of data collected at root s = 188.6 GeV 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/c(2) on the next-to-lightest supersymmetric particle (NLSP) mass and of about 9 TeV on the mass scale parameter Lambda are derived, independently of the NLSP lifetime.

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