The singlet-doublet dark matter model now passes direct detection limits only with small Yukawa couplings or near blind spots, with coannihilation and a compressed spectrum needed to match the observed relic density.
Exact Cross Sections for the Neutralino WIMP Pair-Annihilation
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abstract
We derive a full set of exact, analytic expressions for the annihilation of the lightest neutralino pairs into all two-body tree-level final states in the framework of minimal supersymmetry. We make no simplifying assumptions about the neutralino nor about sfermion masses and mixings other than the absence of explicit CP--violating terms. The expressions should be particularly useful in computing the neutralino WIMP relic abundance without the usual approximation of partial wave expansion.
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Singlet-doublet dark matter revisited
The singlet-doublet dark matter model now passes direct detection limits only with small Yukawa couplings or near blind spots, with coannihilation and a compressed spectrum needed to match the observed relic density.