# $A 4$ Group and Tri-bimaximal Neutrino Mixing - A Renormalizable Model

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The tetrahedron $A 4$ group has been widely used in studying neutrino mixing matrix. It provides a natural framework of model building for the tri-bimaximal mixing matrix. In this class of models, it is necessary to have two Higgs fields, $\chi$ and $\chi-$, transforming under $A 4$ as 3 with one of them having vacuum expectation values for the thr

Autor: Xiao-Gang He

Fuente: https://archive.org/