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The signature is many leptons (electrons or muons, although the SLAC group has been focusing on the muonic final state) in the same cone, resembling a jet. For ATLAS, the leptons usually fall in the same ROI (Region of Interest), requiring additional trigger chains to be sensitive to these events.
The highly collimated leptons provide a distinctive signature in a final state which can be made relatively free of background using available experimental handles. With the larger cross-sections of the SUSY enhanced models, this analysis can begin to probe new regions of phase-space with a luminosity of ~ 50 pb-1.