Tri-bimaximal neutrino mixing and θ13

We propose an extension of tri-bimaximal mixing to include a non-zero reactor angle theta(13) while maintaining the tri-bimaximal predictions for the atmospheric angle theta(23) = 45 degrees and solar angle theta(12) = 35 degrees. We show how Such tri-bimaximal-reactor mixing can arise at leading order from the (type 1) see-saw mechanism with partially constrained sequential dominance. Partially constrained sequential dominance can be realized in CUT models with a non-Abelian discrete family symmetry, such as A(4), spontaneously broken by flavons with a particular vacuum alignment. (C) 2009 Elsevier B.V. All rights reserved.