Search for gauge mediated SUSY breaking topologies in ee collisions at centre-of-mass energies up to 209 GeV

• Published in: The European physical journal. C, Particles and fields Vol. 25; no. 3; pp. 339 - 351
• Main Author: Heister et al, A.
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer Nature B.V 01.10.2002
• Subjects: Apexes; Breaking; Higgs bosons; Leptons; Parameters; Photons; Quarks; Supersymmetry; Topology
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1007/s10052-002-1005-z

A total of 628 bp-1 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 GeV/c2 and for the mass scale parameter \(\Lambda\) at 10 TeV/c2, independently of the NLSP lifetime. Including the results from the neutral Higgs boson searches, a NLSP mass limit of 77 GeV/c2 is obtained and values of \(\Lambda\) up to 16 TeV/c2 are excluded.