Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-11
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, no figures. Wrong sentence below Eq(4) corrected, example replaced Several typos corrected. Results and conclusions c
Scientific paper
We present a new mechanism to explain naturally and through a common flavour symmetry the mildly hierarchical neutrino masses with large mixings and the hierarchical Yukawa matrices with small mixing angles. Although this mechanism is not linked to a particular flavour symmertry, it is particularly simple in the framework of a SU(3) flavour symmetry. In this model, we obtain exactly maximal atmospheric mixing, large although not maximal solar mixing and a normal neutrino hierarchy. All neutrino parameters are basically fixed. For instance, we predict that the angle $\theta_{13}$ comes entirely from the charged lepton sector and, using the difference of the solar angle from maximality, we can fix the mass of lightest neutrino.
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