Tri-bi-maximal mixing in viable family symmetry unified model with extended seesaw

Abstract

We present a Grand Unified model based on SO(10) with a Delta(27) family symmetry. Fermion masses and mixings are fitted and agree well with experimental values. An extended seesaw mechanism plays a key role in the generation of the leptonic mixing, which is approximately tri-bi-maximal.

Comments: 12 pages