Abstract
We study the effective field theory (including operators up to dimension five) of models in which dark matter is composite, consisting of either an electroweak doublet Dirac fermion (`higgsino-like dark matter') or an electroweak triplet Majorana fermion (`wino-like darkmatter'). Some of the dimension-five operators in the former case cause mass splittingsbetween the neutralino and chargino states, leading to a depleted rateof coannihilations and viable thermal relic dark matter with masses ofthe order of tens to hundreds of GeV rather than the usual pure higgsino thermal relicmass of 1 TeV. No such effects are found in the latter case (where the usual thermal relicmass is 3 TeV). Other operators, present for both wino- and higgsino-like dark matter, correspond to inelastic electromagneticdipole moment interactions and annihilation through these can lead toviable models with dark matter masses up by an order of magnitude compared to the usual values.
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