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Among various supersymmetric (SUSY) standard models, the gravity mediationmodel with a neutralino LSP and the gauge mediation model with a very lightgravitino are attractive from the cosmological view point. These models havedifferent scales of SUSY breaking and their underlying physics in high energyis quite different. However, if the sparticles' decay into the gravitino isprompt in the latter case, their collider signatures can be similar: multiplejets and missing transverse momentum. In this paper, we study thediscrimination between these models in minimal cases at the LHC based on themethod using the significance variables in several different modes and show thediscrimination is possible at a very early stage after the discovery.

Discriminating Minimal SUGRA and Minimal Gauge Mediation Models at the Early LHC