Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-11-05
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 2 figures. To appear in Proceedings of SUSY06, the 14th International Conference on Supersymmetry and the Unification
Scientific paper
In gauge-mediated supersymmetry (SUSY) breaking (GMSB) models the lightest supersymmetric particle (LSP) is the gravitino and the phenomenology is driven by the nature of the next-to-lightest SUSY particle (NLSP) which is either the lightest neutralino, the stau or mass degenerate sleptons. Since the NLSP decay length is effectively unconstrained, searches for all possible lifetime and NLSP topologies predicted by GMSB models in e+e- collisions are performed on the data sample collected by OPAL at centre-of-mass energies up to 209 GeV at LEP. Results independent of the NLSP lifetime are presented for all relevant final states including direct NLSP pair-production and, for the first time, also NLSP production via cascade decays of heavier SUSY particles. None of the searches shows evidence for SUSY particle production. Cross-section limits are presented at the 95% confidence level both for direct NLSP production and for cascade decays, providing the most general, almost model independent results. These results are then interpreted in the framework of the minimal GMSB (mGMSB) model, where large areas of the accessible parameter space are excluded. In the mGMSB model, the NLSP masses are constrained to be larger than 53.5 GeV/c^2, 87.4 GeV/c^2 and 91.9 GeV/c^2 in the neutralino, stau and slepton co-NLSP scenarios, respectively. A complete scan on the parameters of the mGMSB model is performed, constraining the universal SUSY mass scale Lambda from the direct SUSY particle searches: Lambda > 40, 27, 21, 17, 15 TeV/c^2 for messenger indices N=1, 2, 3, 4, 5 respectively, for all NLSP lifetimes.
No associations
LandOfFree
Searches for Gauge-Mediated Supersymmetry Breaking Topologies in e+e- collisions at LEP2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Searches for Gauge-Mediated Supersymmetry Breaking Topologies in e+e- collisions at LEP2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Searches for Gauge-Mediated Supersymmetry Breaking Topologies in e+e- collisions at LEP2 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-297262