Softly broken μ τ symmetry in the minimal seesaw model

Juan Carlos Gómez-Izquierdo, Abdel Pérez-Lorenzana

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22 Scopus citations

Abstract

Neutrino oscillations data indicates that neutrino mixings are consistent with an apparent νμ-ντ exchange symmetry in neutrino mass matrix. We observe that in the minimally extended standard model with the seesaw mechanism, one can impose μ τ symmetry at the tree level on all Lagrangian terms, but for the mass difference among μ and τ leptons. In the absence of any new extra physics, this mass difference becomes the only source for the breaking of such a symmetry, which induces, via quantum corrections, small but predictable values for θ13, and for the deviation of θATM from maximality. In the CP conserving case, the predictions only depend on neutrino mass hierarchy and may provide a unique way to test for new physics with neutrino experiments.

Original languageEnglish
Article number113015
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume77
Issue number11
DOIs
StatePublished - 26 Jun 2008
Externally publishedYes

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