摘要
We propose a supersymmetric A 4 ×SU(5) model of quasidegenerate 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 quasidegeneracy is achieved by using A 4 family symmetry (as an example of a non-Abelian family symmetry with real triplet representations) to enforce a contribution to the neutrino mass matrix proportional to the identity. Tribimaximal neutrino mixing as well as quark CP violation with α≈90° and a leptonic CP phase δ MNS ≈90° arise from the breaking of the A 4 family symmetry by the vacuum expectation values of four "flavon" fields pointing in specific postulated directions in flavor space. © 2011 American Physical Society.