Abstract
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.
Highlights
We explore a simple extension to the Standard Model containing two gauge singlets: a Dirac fermion and a real pseudoscalar
We show the box-shaped differential spectra [63] for this channel with its subsequent decay h → γγ, and secondly, restrictions on the parameter space coming from bounds based on searches of gamma rays (FermiLAT), anti-protons (AMS-02), and projections from the Cherenkov Telescope Array (CTA) are presented
In this paper we have explored a simple extension to the SM containing two gauge-singlet fields: a Dirac fermion and a real pseudoscalar
Summary
The model adds to the SM two gauge singlets: one Dirac fermion ψ and a pseudo-scalar s. The linear term in s in (2.1) imply that as ms ≥ 2mψ the pseudoscalar may decay into a pair of ψ, whereas as ms < 2mψ the scalar singlet becomes stable at tree level and at all orders in perturbation theory. With λ a dimensionless coupling, Λ some high energy scale, G the field strength of any gauge field and Gits dual This operator induce the decay of the pseudoscalar singlet into gauge bosons. Considering ms = 103 GeV, we require λ 10−7 for a Planck scale induced operator in order to have a cosmologically stable particle. The signs of gψ and λhs are not relevant for the analysis in this work due to the fact that the relevant processes depend quadratically on them, the theoretical constraints set 0 < λhs < 4π and 0 < gψ < 4π
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