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

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