2009/05/05 by Guido Altarelli, Davide Meloni · 3 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1088/0954-3899/36/8/085005
published as J.Phys.G36:085005,2009 · 20 pages, 2 figures
arxiv created 2009/05/05 · openalex publication_date 2009/07/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
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 × 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-leading approximation. As a consequence the predicted value of θ 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.