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Hierarchical neutrino masses and mixing in non minimal-SU(5)

We consider the problem of neutrino masses and mixing within the framework of a non-minimal supersymmetric SU(5) model extended by adding a set of 1,24 chiral superfields accommodating three right-handed neutrinos. A Type I+III see-saw mechanism can then be realized giving rise to a hierarchical mass spectrum for the light neutrinos of the form m_3> m_2>> m_1 consistent with present data. The extra colored states are pushed to the unification scale by proton stability constraints, while the intermediate see-saw energy scale and the unification scale are maintained in phenomenologically acceptable ranges. We also examine the issue of large neutrino mixing hierarchy θ_{23}> θ_{12}>> θ_{13} in the above framework of hierarchical neutrino masses.