Future CMB Stage IV measurements of N_eff will detect or exclude thermally populated right-handed neutrino partners in most Dirac-neutrino models, constraining new gauge bosons and scalar mediators more strongly than laboratory searches.
Seesaw roadmap to neutrino mass and dark matter
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abstract
We describe the many pathways to generate Majorana and Dirac neutrino mass through generalized dimension-5 operators a la Weinberg. The presence of new scalars beyond the Standard Model Higgs doublet implies new possible field contractions, which are required in the case of Dirac neutrinos. We also notice that, in the Dirac neutrino case, the extra symmetries needed to ensure the Dirac nature of neutrinos can also be made responsible for stability of dark matter.
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Observing Dirac neutrinos in the cosmic microwave background
Future CMB Stage IV measurements of N_eff will detect or exclude thermally populated right-handed neutrino partners in most Dirac-neutrino models, constraining new gauge bosons and scalar mediators more strongly than laboratory searches.