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Fermion masses and mixings and dark matter constraints in a model with radiative seesaw mechanism

  • Nicolás Bernal
  • A. E. Cárcamo Hernández
  • Ivo de Medeiros Varzielas
  • Sergey Kovalenko
Open Access
Regular Article - Theoretical Physics

Abstract

We formulate a predictive model of fermion masses and mixings based on a Δ(27) family symmetry. In the quark sector the model leads to the viable mixing inspired texture where the Cabibbo angle comes from the down quark sector and the other angles come from both up and down quark sectors. In the lepton sector the model generates a predictive structure for charged leptons and, after radiative seesaw, an effective neutrino mass matrix with only one real and one complex parameter. We carry out a detailed analysis of the predictions in the lepton sector, where the model is only viable for inverted neutrino mass hierarchy, predicting a strict correlation between θ23 and θ13. We show a benchmark point that leads to the best-fit values of θ12, θ13, predicting a specific sin2 θ23 ≃ 0.51 (within the 3σ range), a leptonic CP-violating Dirac phase δ ≃ 281.6° and for neutrinoless double-beta decay mee ≃ 41.3 meV. We turn then to an analysis of the dark matter candidates in the model, which are stabilized by an unbroken ℤ2 symmetry. We discuss the possibility of scalar dark matter, which can generate the observed abundance through the Higgs portal by the standard WIMP mechanism. An interesting possibility arises if the lightest heavy Majorana neutrino is the lightest ℤ2-odd particle. The model can produce a viable fermionic dark matter candidate, but only as a feebly interacting massive particle (FIMP), with the smallness of the coupling to the visible sector protected by a symmetry and directly related to the smallness of the light neutrino masses.

Keywords

Beyond Standard Model Discrete Symmetries Neutrino Physics Quark Masses and SM Parameters 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  • Nicolás Bernal
    • 1
    • 2
  • A. E. Cárcamo Hernández
    • 3
  • Ivo de Medeiros Varzielas
    • 4
  • Sergey Kovalenko
    • 3
  1. 1.Centro de InvestigacionesUniversidad Antonio NariñoBogotáColombia
  2. 2.Laboratoire de Physique Théorique, CNRS, Université Paris-Sud, Université Paris-SaclayOrsayFrance
  3. 3.Universidad Técnica Federico Santa María, and Centro Cientıfico-Tecnológico de ValparaísoValparaísoChile
  4. 4.CFTP, Departamento de Física, Instituto Superior TécnicoUniversidade de LisboaLisboaPortugal

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