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- W3185203973 abstract "The EW-$nu_R$ model was constructed in order to provide a seesaw scenario operating at the Electroweak scale $Lambda_{EW} sim 246$ GeV, keeping the same SM gauge structure. In this model, right-handed neutrinos are non-sterile and have masses of the order of $Lambda_{EW}$. They can be searched for at the LHC along with heavy mirror quarks and leptons, the lightest of which have large decay lengths. The seesaw mechanism requires the existence of a complex scalar which is singlet under the SM gauge group. The imaginary part of this complex scalar denoted by $A^{0}_s$ is proposed to be the sub-MeV dark matter candidate in this manuscript. We find that the sub-MeV scalar can serve as a viable non-thermal feebly interacting massive particle (FIMP)-DM candidate. This $A_s^0$ can be a naturally light sub-MeV DM candidate due to its nature as a pseudo-Nambu-Goldstone (PNG) boson in the model. We show that the well-studied freeze out mechanism falls short in this particular framework producing DM overabundance. We identify that the freeze in mechanism produce the correct order of relic density for the sub-MeV DM candidate satisfying all applicable constraints. We then discuss the DM parameter space allowed by the current bounds from the direct and indirect searches for this sub-MeV DM. This model has a very rich scalar sector, consistent with various experimental constraints, predicts a $sim 125$ GeV scalar with the SM Higgs characteristics satisfying the current LHC Higgs boson data." @default.
- W3185203973 created "2021-08-02" @default.
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- W3185203973 date "2021-07-27" @default.
- W3185203973 modified "2023-09-26" @default.
- W3185203973 title "A model of light pseudoscalar dark matter" @default.
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