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The scotogenic type I and type III seesaw models are good candidates toexplain the existence of neutrino masses and dark matter simultaneously.However, since triplet fermions have SU(2) gauge interaction, they cannot beout of equilibrium before the electroweak symmetry breaking. Thus, leptogenesisseems to be difficult within a framework of the pure type III seesaw model.Some extension seems to be required to solve this fault. A model extended byintroducing a singlet fermion could be such a simple example. If the singletfermion is in the thermal equilibrium even for its extremely small neutrinoYukawa coupling, leptogenesis could be shown to occur successfully for a ratherlow mass of the singlet fermion. The required mass could be lowered to$10^4$~GeV.

Low scale leptogenesis in a hybrid model of the scotogenic type I and III seesaw