Measurable Neutrino Mass Scale in A4 x SU(5)

Details Measurable Neutrino Mass Scale in A4 x SU(5) Measurable Neutrino Mass Scale in A4 x SU(5)

2010-05-05

arxiv.org/abs/1005.0708v2

Phys.Rev.D83:013005,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 5 figures; published version

Scientific paper

10.1103/PhysRevD.83.013005

We propose a supersymmetric A4 x SU(5) model of quasi-degenerate neutrinos which predicts the effective neutrino mass m_ee relevant for neutrinoless double beta decay to be proportional to the neutrino mass scale, thereby allowing its determination approximately independently of unknown Majorana phases. Such a natural quasi-degeneracy is achieved by using the A4 (as an example of a non-Abelian family symmetry with real triplet representations) to enforce a type II seesaw contribution to the neutrino mass matrix proportional to the identity. Tri-bimaximal neutrino mixing arises from a type I seesaw contribution via A4 family symmetry and constrained sequential dominance. We perform a numerical fit to the quark and lepton masses and quark mixing where a simple ansatz describing quark CP violation with alpha approximately 90 degrees also leads to the leptonic phase prediction delta_MNS approximately 90 degrees.

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