Small Dirac neutrino masses in supersymmetric grand unified theories

Abstract

A simple mechanism to generate Dirac masses for the neutrinos in SU(5) supersymmetric grand unified theory is proposed. The tiny Dirac masses are induced by the small mixing between the Higgs fields and another superheavy fields. The mixing terms are obtained by the same mechanism as the mu-term generation of the order of the supersymmetry breaking scale, so that the mixing of order TeV / M_GUT \sim 10^{-13} is realized. We consider the lepton flavor violating processes in this model. The branching ratios are directly related to the neutrino oscillation parameters and we can predict the B(τ-> μγ) / B(μ-> e γ) ratio once the neutrino oscillation parameters are determined.

11 pages, 2 figures, references added, version to appear in Phys. Lett B

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• Renormalization Group Evolution of Dirac Neutrino Masses
• The $\mu -\tau$ reflection symmetry of Dirac neutrinos and its breaking effect via quantum corrections
• Flavor Symmetry L_mu - L_tau and quasi-degenerate Neutrinos
• High Scale Mixing Unification for Dirac Neutrinos
• Dirac Neutrinos and Hybrid Inflation from String Theory
• The solar neutrino puzzle: present situation and future scenarios
• Precise predictions for Dirac neutrino mixing
• Leptonic unitarity triangles: RGE running effects and $\mu$-$\tau$ reflection symmetry breaking
• Phenomenology of SUSY SU(5) GUT with neutrinophilic Higgs
• Why is TeV-scale a geometric mean of neutrino mass and GUT-scale?
• Baryogenesis via left-right asymmetry generation by Affleck-Dine mechanism in Dirac neutrino model
• Predictions From High Scale Mixing Unification Hypothesis