Neutrino Masses via a Seesaw with Heavy Majorana and Dirac Neutrino Mass Matrices from Discrete Subgroup Δ(27) of SU(3)

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Neutrino mass matrix via a seesaw mechanism is constructed by assuming that the underlying symmetry of both heavy Majorana and Dirac mass matrices is the discrete subgroup Δ(27) symmetry of SU(3). Using the experimental data of neutrino oscillation, the neutrino mass matrix exhibits maximal νμ-ντ mixing and has a specific prediction on the effective neutrino mass in neutrinoless double beta decay which can be tested in future experiment.