Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-08-24
Phys.Rev.D83:013002,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages
Scientific paper
10.1103/PhysRevD.83.013002
We present the general form of the unitary matrices keeping invariant the Majorana neutrino mass matrix of specific texture suitable for explaining oscillation data. In the case of the Tri-bimaximal pattern with two degenerate masses we give a specific realization of the underlying $U(1)$ symmetry which can be uplifted to a symmetry in a complete theory including charged leptons. For this, we present a model with three light SM-like Higgs doublets and one heavy Higgs triplet and find that one can accommodate the hierarchy of the charged lepton masses. The lepton mass spectrum can also be achieved in another model extending the SM with three SM-singlet scalars transforming non trivially under the flavor symmetry. We discuss how such a model has room for generating enough baryon asymmetry through leptogenesis in the framework of Type-I and II seesaw mechanisms.
Chamoun Nidal
Lashin E. I.
Malkawi Ehab
Nasri Salah
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