A model for leptogenesis at the TeV scale
  We consider the mechanism of thermal leptogenesis at the TeV scale in the context of an extension of the Standard Model with 4 generations and the inclusion of four right-handed Majorana neutrinos. We obtain a value for the baryon asymmetry of the   Universe in accordance with observations by solving the full set of coupled Boltzmann equations for this model. 
Asmaa Abada, Habib Aissaoui, Marta Losada