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We study the possibility of generating light Dirac neutrino mass viascotogenic mechanism where singlet-doublet fermion dark matter (DM) playsnon-trivial role in generating one-loop neutrino mass, anomalous magneticmoment of muon $(g-2)_\mu$ as well as additional relativistic degrees offreedom $\Delta{N_{\rm eff}}$ within reach of cosmic microwave background (CMB)experiments. We show that the Dirac nature of neutrinos can bring interestingcorrelations within the parameter space satisfying the $\left(g-2\right)_\mu$anomaly and DM relic density and the effective relativistic degrees of freedom$\Delta{N_{\rm eff}}$. While we stick to thermal singlet doublet DM withpromising detection prospects, both thermal and non-thermal origin of$\Delta{N_{\rm eff}}$ have been explored. In addition to detection prospects atDM, $(g-2)$ and other particle physics experiments, the model remainsverifiable at future CMB experiments like CMB-S4, SPT-3G.

Singlet-doublet fermion dark matter with Dirac neutrino mass, $(g-2)_\mu$ and $\Delta N_{\rm eff}$