Maximal atmospheric neutrino mixing in an SU(5) model

  • W. Grimus
  • L. Lavoura
Theoretical Physics


We show that maximal atmospheric and large solar neutrino mixing can be implemented in SU(5) gauge theories, by making use of the U(1) F symmetry associated with a suitably defined family number F, together with a Z2 symmetry which does not commute with F. U(1) F is softly broken by the mass terms of the right-handed neutrino singlets, which are responsible for the seesaw mechanism; in additio n, U(1) F is also spontaneously broken at the electroweak scale. In our scenario, lepton mixing stems exclusively from the right-handed-neutrino Majorana mass matrix, whereas the CKM matrix originates solely in the up-type-quark sector. We show that, despite the non-supersymmetric character of our model, unification of the gauge couplings can be achieved at a scale 1016 GeV < m U < 1019 GeV; indeed, we have found a particula r solution to this problem which yields results almost identical to the ones of the minimal supersymmetric standard model.


Gauge Theory Mass Matrix Minimal Supersymmetric Standard Model Mass Term Gauge Coupling 
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Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2003

Authors and Affiliations

  • W. Grimus
    • 1
  • L. Lavoura
    • 2
  1. 1.Universität Wien, Institut für Theoretische Physik, Boltzmanngasse 5, 1090 Wien, Austria AT
  2. 2. Universidade Técnica de Lisboa, Centro de Física das Interacções Fundamentais, Instituto Superior Técnico, 1049-001 Lisboa, Portugal PT

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