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Fermion Singlet Dark Matter in a Pseudoscalar Dark Matter Portal
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We explore a simple extension to the Standard Model containing two gauge singlets: a Dirac fermion and a real pseudoscalar. In some regions of the parameter space both singlets are stable without the necessity of additional symmetries, then becoming a possible two-component dark matter model. We study the relic abundance production via freeze-out, with the latter determined by annihilations, conversions and semi-annihilations. Experimental constraints from invisible Higgs decay, dark matter relic abundance and direct/indirect detection are studied. We found three viable regions of the parameter space, and the model is sensitive to indirect searches.
Forward citations
Cited by 2 Pith papers
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FIMPs in a two-component dark matter model with $Z_2 \times Z_4$ symmetry
In this two-component dark matter model, freeze-in works with masses up to 3 TeV only if the scalar portal coupling is as small as 10^-25, far below usual FIMP values.
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Revisiting Singlet Fermion Dark Matter with a Scalar Portal: Connecting Higgs Phenomenology and Strong Electroweak Phase Transition
In a no-VEV singlet scalar + singlet fermion dark matter extension of the SM, a strong first-order electroweak phase transition, the observed dark matter relic density, and collider/direct-detection constraints can co...
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