In the small-coupling limit of the singlet-doublet dark matter model, the relic density is set by co-scattering, freeze-in, or SuperWIMP decays rather than ordinary freeze-out, and the observable signals move from direct detection to long-lived particle searches at colliders.
Singlet-Doublet Dirac Dark Matter
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abstract
We analyze a simple extension of the Standard Model where the dark matter particle is a Dirac fermion that is mixture of a singlet and an SU(2) doublet. The model contains only four free parameters: the singlet and the doublet masses and two new Yukawa couplings. Direct detection bounds in this model are very strong and require the dark matter particle to be singlet-like. As a result, its relic density has to be obtained via coannihilations with the doublet. We find that the dark matter mass should be below 750 GeV, that the singlet-doublet mass difference cannot exceed 9%, and that direct detection experiments offer the best chance to probe this scenario. Finally, we also show that this model can effectively arise in well-motivated extensions of the Standard Model.
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hep-ph 1years
2026 1verdicts
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Singlet-doublet dark matter beyond freeze-out
In the small-coupling limit of the singlet-doublet dark matter model, the relic density is set by co-scattering, freeze-in, or SuperWIMP decays rather than ordinary freeze-out, and the observable signals move from direct detection to long-lived particle searches at colliders.