Abstract
Searches for final states expected in models with light gravitinos have been performed, including experimental topologies with multi-leptons with missing energy, leptons and photons with missing energy, and jets and photons with missing energy. No excess over the expectations from the Standard Model has been observed. Limits are placed on production cross-sections in the different experimental topologies. Additionally, combining with searches for the anomalous production of lepton and photon pairs with missing energy, results are interpreted in the context of minimal models of gauge mediated SUSY breaking. Exclusion limits at the 95% confidence level on the supersymmetric particle masses of m ℓ ̃ > 83 GeV and m χ ̃ 1 0 > 85 GeV for tan β=2, and m τ ̃ > 69 GeV, m e ̃ , μ ̃ > 88 GeV and m χ ̃ 1 0 > 76 GeV for tan β=20, are established.
Highlights
Supersymmetry (SUSY) provides a method of solving the “naturalness” or “hierarchy” problem by introducing a set of new particles which cancel the large radiative corrections to the Higgs mass
This paper reports the first OPAL results on the systematic search for experimental topologies expected in SUSY models with a light gravitino, assuming prompt decays of the next-to-lightest SUSY particle (NLSP) into the G
In addition to the new experimental searches which have sensitivity to general SUSY models with light gravitinos, the results reported in this paper are combined with those from previous publications to constrain minimal gauge mediated SUSY breaking (GMSB) models
Summary
Supersymmetry (SUSY) provides a method of solving the “naturalness” or “hierarchy” problem by introducing a set of new particles which cancel the large radiative corrections to the Higgs mass. It is typically assumed that SUSY is broken in some “hidden” sector of new particles, and is “communicated” (or mediated) to the “visible” sector of SM and SUSY particles by one of the known interactions Two scenarios for this mediation have been widely investigated: gravity and gauge mediation. This paper reports the first OPAL results on the systematic search for experimental topologies expected in SUSY models with a light gravitino, assuming prompt decays of the NLSP into the G. It is possible for the NLSP lifetime to be significant and it may decay near the interaction point, at an observably macroscopic distance, or outside the detector. Results from searches for GMSB have been reported by other collaborations [8, 9]
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