Theoretical Models of Neutrino Mixing: Recent Developments

Abstract

The data on neutrino mixing are at present compatible with Tri-Bimaximal (TB) mixing. If one takes this indication seriously then the models that lead to TB mixing in first approximation are particularly interesting and A4 models are prominent in this list. However, the agreement of TB mixing with the data could still be an accident. We discuss a recent model based on S4 where Bimaximal mixing is instead valid at leading order and the large corrections needed to reproduce the data arise from the diagonalization of charged leptons. The value of ${\theta }_{13}$ could distinguish between the two alternatives.

21 pages. Talk at the 13th International Workshop on Neutrino Telescopes, Venice, March 10-13, 2009

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• Model of leptons from $SO(3)\to A_4$
• Radiative Seesaw in SO(10) with Dark Matter
• Flavour Theory: 2009