Speaker
Description
The addition of two gauge singlet right-handed neutrinos to the Standard Model is a minimal extension that can potentially solve multiple open questions at once, including the observed neutrino masses via the Type-I seesaw mechanism, and the baryon asymmetry of the universe via leptogenesis. We show that combining the constraints from low-scale leptogenesis and the current non-observation of neutrinoless double beta decay ($0\nu\beta\beta$) proves to be a powerful complement to the limits obtained from Big Bang Nucleosynthesis and collider searches in order to constrain the masses and mixings of heavy neutrinos. Improved limits on $0\nu \beta\beta$ from next-generation experiments will restrict the allowed parameter space to narrow bands in the mass-mixing plane in case of inverted neutrino mass ordering, which could be probed by future collider programs, making such models with MeV-GeV range heavy neutrinos fully testable.
