A bstract We study the possibility of generating light Dirac neutrino mass via scotogenic mechanism where singlet-doublet fermion Dark Matter (DM) plays non-trivial role in generating one-loop neutrino mass, anomalous magnetic moment of muon: ( g − 2) μ as well as additional relativistic degrees of freedom ∆ N eff within reach of cosmic microwave background (CMB) experiments. We show that the Dirac nature of neutrinos can bring interesting correlations within the parameter space satisfying the ( g − 2) μ , DM relic density and the effective relativistic degrees of freedom ∆ N eff . While we stick to thermal singlet-doublet DM with promising detection prospects, both thermal and non-thermal origin of ∆ N eff have been explored. In addition to detection prospects of the model at DM, ( g − 2) μ and other particle physics experiments, it remains verifiable at future CMB experiments like CMB-S4 and SPT-3G.
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Borah et al. (2024) studied this question.