Journal
PHYSICAL REVIEW D
Volume 81, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.053008
Keywords
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Funding
- Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) [SFRH/BD/36994/2007]
- FCT [CFTP-FCT UNIT 777, CERN/FP/83502/2008]
- POCTI (FEDER)
- Marie Curie [RTNs MRT-CT-2006035505.]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/36994/2007, CERN/FP/83502/2008] Funding Source: FCT
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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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