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Authors
Advisor(s)
Abstract(s)
It 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.
Description
Keywords
Constraints Leptogenesis Symmetry Viewpoint
Citation
Felipe R G, Serodio H. Constraints on leptogenesis from a symmetry viewpoint. Physical Review D. 2010; 81 (5): Art. No. 053008.