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Dark gauge bosons, which can be produced by a number of exotic processes, are allowed to decay back to Standard Model particles. The signature is many leptons 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 SLAC group has been focusing on the muonic final state.

The highly collimated muons 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.