Leptogenesis, radiative neutrino masses and inert Higgs triplet dark matter

Understand

We extend the standard model by three types of inert fields including Majorana fermion singlets/triplets, real Higgs singlets/triplets and leptonic Higgs doublets.

• In the presence of a softly broken lepton number and an exactly conserved Z_2 discrete symmetry, these inert fields together can mediate a one-loop diagram for a Majorana neutrino mass generation.
• The heavier inert fields can decay to realize a successful leptogenesis while the lightest inert field can provide a stable dark matter candidate.
• As an example, we demonstrate the leptogenesis by the inert Higgs doublet decays.