Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-05-05
J.Phys.G36:085005,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 2 figures
Scientific paper
10.1088/0954-3899/36/8/085005
We present a see-saw $A_4$ model for Tri-Bimaximal mixing which is based on a very economical flavour symmetry and field content and still possesses all the good features of $A_4$ models. In particular the charged lepton mass hierarchies are determined by the $A_4\times Z_4$ flavour symmetry itself without invoking a Froggatt-Nielsen U(1) symmetry. Tri-Bimaximal mixing is exact in leading order while all the mixing angles receive corrections of the same order in next-to-the-leading approximation. As a consequence the predicted value of $\theta_{13}$ is within the sensitivity of the experiments which will take data in the near future. The light neutrino spectrum, typical of $A_4$ see-saw models, with its phenomenological implications, also including leptoproduction, is studied in detail.
Altarelli Guido
Meloni Davide
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