Abstract
We explore the multi-component dark matter (DM) scenario considered in a simple extension of the standard model with an inert scalar doublet and a singlet fermionic field providing the two DM candidates. The DM states are made stable under the unbroken Z_2times Z_2' discrete symmetry. An additional gauge singlet scalar field is introduced to facilitate the interaction of the dark fermion with the visible sector. Presence of a charged fermionic field having the same Z_2 charge as that of the inert scalar field allows exploring the dark matter mass regions otherwise disallowed, like in the standard Inert Doublet Model (IDM) scenarios. With these arrangements, it is shown that the light DM scenario and the desert region in the intermediate mass range of DM in the standard IDM case can be made compatible with the relic density bounds and direct detection limits. Further, detailed parameter space study is carried out keeping the coexistence of both the scalar and fermionic components in focus, showing that sizable parameter space regions are available for the entire mass range of 10 mathrm GeV le M_{DM}le 2000 GeV.
Highlights
Λ7, μ4, μ6 and μ8 would influence the annihilation through s-channel into singlet scalar or the Standard Model (SM) Higgs boson mediated by these same scalar fields. λ8, which can involve in the H0 H0 annihilation to the singlet scalars through a four-point interaction on the other hand will not 45 ≤ MH0 ≤ 63
The scalar-fermionic multipartite scenarios discussed in the literature have the dark matter (DM) candidates as gauge singlets and highly constrained by the direct detection experiments and relic density limits
The gauge non-singlet scalar dark matter models like the Inert Doublet Model (IDM) overkills the dark matter leading to underabundance except when they are close to a TeV of mass
Summary
One with λL = μ5 = y3 = 0 as the most conservative approach, so that the invisible decay of H to the dark matter particles is disallowed, and the second case in which we relax this with non-zero values of these couplings, which are compatible with the present experimental limit on the invisible decay of Higgs boson. Before the gauge boson annihilation channels open up for ψ at Mψ ∼ 80 GeV, the fermionic component 2h2 is larger than the allowed relic density, unless the other annihilation channel ψψ → f f , where f denotes the SM fermions, is sizable This latter process, mediated by the singlet component of H and HS depends on the combination of y3 sin 2α through the (ψψ H, f f H ) pair of interactions (see Fig. 1) in the H mediated case, and through (ψψ HS, f f HS) pair in the HS mediated case. While these processes are suppressed by the Higgs mixing, these are much more significant compared to the f fannihilation channel with σψψ →V V σψψ → f f x
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