Authors: Ivan Girardi Aurora Meroni ST Petcov Martin Spinrath
Publish Date: 2014/02/12
Volume: 2014, Issue: 2, Pages: 50-
Abstract
We analyse the interplay of generalised CP transformations and the nonAbelian discrete group T ′ and use the semidirect product G f = T ′ ⋊H CP as family symmetry acting in the lepton sector The family symmetry is shown to be spontaneously broken in a geometrical manner In the resulting flavour model naturally small Majorana neutrino masses for the light active neutrinos are obtained through the type I seesaw mechanism The known masses of the charged leptons lepton mixing angles and the two neutrino mass squared differences are reproduced by the model with a good accuracy The model allows for two neutrino mass spectra with normal ordering NO and one with inverted ordering IO For each of the three spectra the absolute scale of neutrino masses is predicted with relatively small uncertainty The value of the Dirac CP violation CPV phase δ in the lepton mixing matrix is predicted to be δ = π/2 or 3π/2 Thus the CP violating effects in neutrino oscillations are predicted to be maximal given the values of the neutrino mixing angles and experimentally observable We present also predictions for the sum of the neutrino masses for the Majorana CPV phases and for the effective Majorana mass in neutrinoless double beta decay The predictions of the model can be tested in a variety of ongoing and future planned neutrino experimentsThis article is published under an open access license Please check the Copyright Information section for details of this license and what reuse is permitted If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and reuse information please contact the Rights and Permissions team
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