Abstract
We analyze the structure of quark and lepton mass matrices under the hypothesis that they are determined from a minimum principle applied to a generic potential invariant under the [SU(3)]5 ⊗ \( \mathcal{O} \)(3) flavor symmetry, acting on Standard Model fermions and right-handed neutrinos. Unlike the quark case, we show that hierarchical masses for charged leptons are naturally accompanied by degenerate Majorana neutrinos with one mixing angle close to maximal, a second potentially large, a third one necessarily small, and one maximal relative Majorana phase. Adding small perturbations the predicted structure for the neutrino mass matrix is in excellent agreement with present observations and could be tested in the near future via neutrino-less double beta decay and cosmological measurements. The generalization of these results to arbitrary sew-saw models is also discussed.
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Alonso, R., Gavela, M.B., Isidori, G. et al. Neutrino mixing and masses from a minimum principle. J. High Energ. Phys. 2013, 187 (2013). https://doi.org/10.1007/JHEP11(2013)187
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DOI: https://doi.org/10.1007/JHEP11(2013)187