Journal of High Energy Physics

, 2012:128 | Cite as

Maximal CP violation in lepton mixing from a model with Δ(27) flavour symmetry

  • P. M. Ferreira
  • W. GrimusEmail author
  • L. Lavoura
  • P. O. Ludl


We propose a simple mechanism which enforces \(\left| {{U_{\mu j}}} \right| = \left| {{U_{\tau j}}} \right|\forall j = 1,2,3\) in the lepton mixing matrix U. This implies maximal atmospheric neutrino mixing and a maximal CP-violating phase but does not constrain the reactor mixing angle θ 13. We implement the proposed mechanism in two renormalizable seesaw models which have features strongly resembling those of models based on a flavour symmetry group Δ(27). Among the predictions of the models, there is a determination, although ambiguous, of the absolute neutrino mass scale, and a stringent correlation between the absolute neutrino mass scale and the effective Majorana mass in neutrinoless double-beta decay.


Discrete and Finite Symmetries Beyond Standard Model Neutrino Physics 


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Copyright information

© SISSA, Trieste, Italy 2012

Authors and Affiliations

  • P. M. Ferreira
    • 1
    • 2
  • W. Grimus
    • 3
    Email author
  • L. Lavoura
    • 4
  • P. O. Ludl
    • 3
  1. 1.Department of PhysicsInstituto Superior de Engenharia de LisboaLisbonPortugal
  2. 2.Centre for Theoretical and Computational PhysicsUniversity of LisbonLisbonPortugal
  3. 3.Faculty of PhysicsUniversity of ViennaViennaAustria
  4. 4.CFTP, Instituto Superior TécnicoTechnical University of LisbonLisbonPortugal

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