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We map the parameter space for MSSM neutralino dark matter which freezes outto the observed relic abundance, in the limit that all superpartners except theneutralinos and charginos are decoupled. In this space of relic neutralinos, weshow the dominant dark matter annihilation modes, the mass splittings among theelectroweakinos, direct detection rates, and collider cross-sections. The massdifference between the dark matter and the next-to-lightest neutral and chargedstates is typically much less than electroweak gauge boson masses. With thesesmall mass differences, the relic neutralino surface is accessible to a future100 TeV hadron collider, which can discover inter-neutralino mass splittingsdown to 1 GeV and thermal relic dark matter neutralino masses up to 1.5 TeVwith a few inverse attobarns of luminosity. This coverage is a directconsequence of the increased collider energy: the Standard Model events withmissing transverse momentum in the TeV range have mostly hard electroweakradiation, distinct from the soft radiation shed in compressed electroweakinodecays. We exploit this kinematic feature in final states including photons andleptons, tailored to the 100 TeV collider environment.

The Relic Neutralino Surface at a 100 TeV collider