Natural leptogenesis and neutrino masses with two Higgs doublets
Jackson D Clarke, Robert Foot, Raymond R Volkas
PHYSICAL REVIEW D | AMER PHYSICAL SOC | Published : 2015
The minimal Type I seesaw model cannot explain the observed neutrino masses and the baryon asymmetry of the Universe via hierarchical thermal leptogenesis without ceding naturalness. We show that this conclusion can be avoided by adding a second Higgs doublet with tanβ 4. The models considered naturally accommodate a standard model-like Higgs boson and predict TeV-scale scalar states and low- to intermediate-scale hierarchical leptogenesis with 103 GeV MN1 108 GeV.
This work was supported in part by the Australian Research Council.