Double seesaw mechanism and lepton mixing

  • W. GrimusEmail author
  • L. Lavoura
Open Access


We present a general framework for models in which the lepton mixing matrix is the product of the maximal mixing matrix U ω times a matrix constrained by a well-defined \( {{\mathbb{Z}}_2} \) symmetry. Our framework relies on neither supersymmetry nor non-renormalizable Lagrangians nor higher dimensions; it relies instead on the double seesaw mechanism and on the soft breaking of symmetries. The framework may be used to construct models for virtually all the lepton mixing matrices of the type mentioned above which have been proposed in the literature.


Neutrino Physics Discrete and Finite Symmetries 


Open Access

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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  1. 1.Faculty of PhysicsUniversity of ViennaWienAustria
  2. 2.Instituto Superior Técnico, CFTPUniversidade de LisboaLisboaPortugal

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