Abstract
We extend the Dirac Scotogenic model with the aim of realizing neutrino masses together with the mass of a keV-scale dark matter (DM) candidate via the same one-loop topology. Two of the Standard Model (SM) neutrinos become massive Dirac fermions while the third one remains massless. Our particle content is motivated by an anomaly free U(1)B-L gauge symmetry with exotic irrational charges and we need to enforce an additional \( \mathcal{Z} \)5 symmetry. The dark matter candidate does not mix with the active neutrinos and does not have any decay modes to SM particles. DM is produced together with dark radiation in the form of right handed neutrinos via out of equilibrium annihilations of the SM fermions mediated by the heavy B-L gauge boson. In order to avoid DM over-production from Higgs decays and to comply with Lyman-α bounds we work in a low temperature reheating scenario with 4 MeV ≲ TRH ≲ 5 GeV. Our setup predicts a contribution to ∆Neff. that decreases for larger DM masses and is below the sensitivity of upcoming precision measurements such as CMB-S4. A future observation of a signal with ∆Neff. ≳ 0.012 would exclude our scenario. We further sketch how inflation, reheating and Affleck-Dine baryogenesis can also be potentially realized in this unified framework.
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Berbig, M. Freeze-In of radiative keV-scale neutrino dark matter from a new U(1)B-L. J. High Energ. Phys. 2022, 101 (2022). https://doi.org/10.1007/JHEP09(2022)101
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DOI: https://doi.org/10.1007/JHEP09(2022)101