Abstract
Analyzing the neutrino Yukawa effect in the freeze-out process of a generic dark matter candidate with right-handed neutrino portal, we identify the parameter regions satisfying the observed dark matter relic density as well as the current Fermi-LAT and H.E.S.S. limits and the future CTA reach on gamma-ray signals. In this scenario the dark matter couples to the Higgs boson at one-loop level and thus could be detected by spin-independent nucleonic scattering for a reasonable range of the relevant parameters.
Highlights
The smallness of neutrino masses may be explained by the presence of right-handed neutrinos (RHNs) with large Majorana mass realizing the seesaw mechanism [1]
Preprint submitted to Elsevier the observed dark matter (DM) relic density can be achieved by the DM annihilation rate different from the standard freeze-out value [2, 3]
We explore the enlarged parameter space including the RHN Yukawa effect to investigate how it is constrained by the thermal DM relic density, direct and indirect detections
Summary
The smallness of neutrino masses may be explained by the presence of right-handed neutrinos (RHNs) with large Majorana mass realizing the seesaw mechanism [1]. The RHN-portal process, φφ → N N through the t-channel exchange of χ, can be operative to produce the Boltzmann equations written in terms of the variright thermal relic density. For our analysis of indirect detection, we will assume N decaying to three lepton flavors
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