ar X iv : 0 90 9 . 08 28 v 2 [ he p - ph ] 1 5 Se p 20 09 The Z 2 × Z 2 Symmetry of the Tripartite Model
نویسنده
چکیده
We point out a Z2 × Z2 symmetry which characterizes uniquely the phenomenologically successful tripartite form leading to a tri-bimaximal mixing in the neutrino mass matrix. We impose this symmetry in a set up including the charged leptons and find that it can accommodate all the possible patterns of lepton masses in the framework of type-I and type-II seesaw mechanism. We also discuss the possibility of generating enough baryon asymmetry through lepton-lepton asymmetry.
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