Author:
Geytenbeek Ben,Gripaios Ben
Abstract
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 dark
matter'). Some of the dimension-five operators in the former case cause mass splittings
between the neutralino and chargino states, leading to a depleted rate
of coannihilations and viable thermal relic dark matter with masses of
the order of tens to hundreds of GeV rather than the usual pure higgsino thermal relic
mass of 1 TeV. No such effects are found in the latter case (where the usual thermal relic
mass is 3 TeV). Other operators, present for both wino- and higgsino-like dark matter, correspond to inelastic electromagnetic
dipole moment interactions and annihilation through these can lead to
viable models with dark matter masses up by an order of magnitude compared to the usual values.
Subject
Astronomy and Astrophysics
Cited by
2 articles.
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