Constraints on leptogenesis from a symmetry viewpoint

Details Constraints on leptogenesis from a symmetry viewpoint Constraints on leptogenesis from a symmetry viewpoint

2009-08-20

arxiv.org/abs/0908.2947v3

Phys.Rev.D81:053008,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages; a few comments added; final version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.81.053008

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.

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