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In compressed supersymmetry, a light top squark naturally mediates efficientneutralino pair annihilation to govern the thermal relic abundance of darkmatter. I study the LHC signal of same-sign leptonic top-quark decays fromgluino and squark production, which follows from gluino decays to top plus stopfollowed by the stop decaying to a charm quark and the LSP in these models.Measurements of the numbers of jets with heavy-flavor tags in the same-signlepton events can be used to confirm the origin of the signal. Summedtransverse momentum observables provide an estimate of an effectivesuperpartner mass, which is correlated with the gluino mass. Measurements ofinvariant mass endpoints from the visible products of gluino decays do notallow direct determination of superpartner masses, but can place constraints onthem, including lower bounds on the gluino mass as a function of the top-squarkmass.

Exploring compressed supersymmetry with same-sign top quarks at the Large Hadron Collider