Felipe, Ricardo GonzalezSerodio, H.2012-03-132012-03-132010-03Felipe R G, Serodio H. Constraints on leptogenesis from a symmetry viewpoint. Physical Review D. 2010; 81 (5): Art. No. 053008.1550-7998http://hdl.handle.net/10400.21/1278It is shown that type I seesaw models based on the standard model Lagrangian extended with three heavy Majorana right-handed fields do not have leptogenesis in leading order, if the symmetries of mass matrices are also the residual symmetry of the Lagrangian. In particular, flavor models that lead to a mass-independent leptonic mixing have a vanishing leptogenesis CP asymmetry. Based on symmetry arguments, we prove that in these models the Dirac-neutrino Yukawa coupling combinations relevant for leptogenesis are diagonal in the physical basis where the charged leptons and heavy Majorana neutrinos are diagonal.engConstraintsLeptogenesisSymmetry Viewpointjournal article