Measurable neutrino mass scale in A4 x SU(5)

We propose a supersymmetric A(4) x 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 alpha approximate to 90 degrees and a leptonic CP phase delta(MNS) approximate to 90 degrees 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.