Abstract
We consider an extension of the standard model (SM) with an inert Higgs doublet and three Majorana singlet fermions to address both origin and the smallness of neutrino masses and dark matter (DM) problems. In this setup, the lightest Majorana singlet fermion plays the role of DM candidate and the model parameter space can be accommodated to avoid different experimental constraints such as lepton flavor violating processes and electroweak precision tests. The neutrino mass is generated at one-loop level a la Scotogenic model and its smallness is ensured by the degeneracy between the CP-odd and CP-even scalar members of the inert doublet. Interesting signatures at both leptonic and hadronic colliders are discussed.
Highlights
The discovery of the Higgs particle at the LHC in 2012 [1], validated the standard model (SM) of particle physics
It is worth mentioning that even though one could allow M1 to vary over the mass range in (27), for dark matter (DM) heavier than 700 GeV the relic density requires the couplings hi;1 to be much larger than unity so that the relic density will be in agreement with the observed value
We considered the inert Higgs doublet model extended by three right handed neutrinos where both neutrino mass and dark matter are addressed
Summary
The discovery of the Higgs particle at the LHC in 2012 [1], validated the standard model (SM) of particle physics. We will investigate the case where the lightest Majorana singlet fermion plays the role of DM candidate instead of the neutral CP-odd or CPeven scalars We will show that the model parameter space can be accommodated to avoid different experimental constraints such as lepton flavor violating processes and electroweak precision tests. In this setup, the neutrino mass smallness is ensured by making the splitting between the CP-even and CP-odd scalars very tiny.
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