Fermion Singlet Dark Matter in a Pseudoscalar Dark Matter Portal

Sáez, Bastián Díaz; Escalona, Patricio; Norero, Sebastián; Zerwekh, Alfonso R.

doi:10.48550/arxiv.2105.04255

Cited by 1 publication

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“…In view of this, it may be of interest to look for regions of parameter space in this framework which evade the strong direct detection constraints, possibly allowing DM with masses of several hundred GeV up to a few TeV. For instance, in [11] (also see [23,24]) such a two-component scalar model is explored under the assumption that one of the scalars couples very weakly to the Higgs (λ ∼ 10 −5 ), giving rise to a chronology in the decoupling process (exchange driven freeze-out), with DM conversion being a pivotal process in the determination of the relic abundance. They show that this mechanism successfully evades JCAP10(2021)027…”

Section: Introductionmentioning

confidence: 99%

Two real scalar WIMP model in the assisted freeze-out scenario

Sáez¹,

Möhling²,

Stöckinger³

2021

J. Cosmol. Astropart. Phys.

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We study a simple dark matter model given by two interacting real singlet scalars, with only one of them coupled to the Higgs. The model therefore presents a minimal assisted -freeze-out framework: both scalars contribute to the dark matter relic density, but only one of them takes part in the elastic scattering with nuclei. This reduces the expected interaction rate in direct detection experiments, in such a way that the model in some regions of the parameter space may evades XENON1T constraints. We explore the model under theoretical (perturbativity, stability potential and unitarity) and experimental constraints (Higgs to invisible, relic density, direct detection), with precise approximations near the Higgs resonance to calculate the averaged annihilation cross section. We show that the model is viable in the Higgs resonance region and for scalar singlet masses of hundreds of GeV.

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Section: Introductionmentioning

confidence: 99%