Leptogenesis in seesaw models with a twofold-degenerate neutrino Dirac mass matrix

Abstract

We study leptogenesis in two seesaw models where maximal atmospheric neutrino mixing and $U_{e3}=0$ result from symmetries. Salient features of those models are the existence of three Higgs doublets and a twofold degeneracy of the neutrino Dirac mass matrix. We find that in those models both leptogenesis and neutrinoless double beta decay depend on the same unique Majorana phase. Leptogenesis can produce a baryon asymmetry of the universe of the right size provided the mass of the heavy neutrino whose decays generate the lepton asymmetry is in the range $10^{11}$--$10^{12}\mathrm{GeV}$. Moreover, in these models, leptogenesis precludes an inverted neutrino mass spectrum since it requires the mass of the lightest neutrino to be in the range $10^{-3}$--$10^{-2}\mathrm{eV}$.

22 pages, plain Latex, 3 figures; changes in the presentation, clarifications and one reference added, final version for J. Phys. G

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• Neutrino Mass Textures with Maximal CP Violation
• Leptonic CP Violation Induced by Approximately mu-tau Symmetric Seesaw Mechanism
• Covariant Extremisation of Flavour-Symmetric Jarlskog Invariants and the Neutrino Mixing Matrix
• Generalized Scaling Ansatz and Minimal Seesaw Mechanism
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• Lepton mixing and the charged-lepton mass ratios
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• The small mixing angle ${\theta }_{13}$ and the lepton asymmetry
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• Leptonic CP Violation and Baryon Asymmetry
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