Hierarchical Neutrino Masses and Mixing in Flipped-SU(5)

Abstract

We consider the problem of neutrino masses and mixing in the framework of flipped SU(5). The right-handed neutrino mass, generated through the operation of a seesaw mechanism by a sector of gauge singlets, leads naturally, at a subsequent level, to the standard seesaw mechanism resulting into three light neutrino states with masses of the desired phenomenological order of magnitude. In this framework we study simple Ansatze for the singlet couplings for which hierarchical neutrino masses emerge naturally, parametrized in terms of the Cabbibo parameter. The resulting neutrino mixing matrices are characterized by a hierarchical structure, in which theta-(13) is always predicted to be the smallest. Finally, we discuss a possible factorized parametrization of the neutrino mass that, in addition to Cabbibo mixing, encodes also mixing due to the singlet sector.

10 pages

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• A Measurement of Atmospheric Neutrino Oscillation Parameters by Super-Kamiokande I
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Cited by in corpus (5)

• Starobinsky-like Inflation, Supercosmology and Neutrino Masses in No-Scale Flipped SU(5)
• Classification of Flipped SU(5) Heterotic-String Vacua
• Dimension Four Wins the Same Game as the Standard Model Group
• Proton Stability in $SU(5)\times U(1)$ and $SU(6)\times SU(2)$ GUTs
• Hierarchical neutrino masses and mixing in non minimal-SU(5)