Atmospheric neutrino oscillations and maximal nu_mu-nu_tau mixing in unified models

Abstract

The recent data describing the evidence for neutrino oscillations by Super Kamiokande implies that two neutrinos are very strongly mixed. We ask the question: can approximate maximal neutrino mixing be natural in unified (GUT or string) models? We attempt to answer this question in as much generality as possible. Without specifying a particular model, we are able to show that a gauged family symmetry can naturally provide the required maximal mixing between mu and tau neutrinos. The second and third family neutrino mass eigenstates are almost degenerate with masses of order 0.2 eV.

11 pages LaTeX. 1 eps figure included; minor changes

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• Measurements of the Solar Neutrino Flux from Super-Kamiokande's First 300 Days
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Cited by in corpus (12)

• Naturalness of nearly degenerate neutrinos
• A General Classification of Three-Neutrino Models and U_e3
• Large Neutrino Mixing from Renormalization Group Evolution
• Permutation Symmetry for Neutrino and Charged-Lepton Mass Matrices
• A Two Parameter Texture of Nearly Bi-maximal Neutrino Mixing
• Probing maximal zero textures with broken cyclic symmetry in inverse seesaw
• Simple Connection Between Atmospheric and Solar Neutrino Vacuum Oscillations
• Four Light Neutrinos in Singular Seesaw Mechanism with Abelian Flavor Symmetry
• Large Lepton Mixings from Continuous Symmetries
• Renormalization-Group Effects in the SO(3) Gauge Model With Nearly Degenerate Neutrino Masses and Bi-maximal Mixing
• Maximal ${\nu }_{\mu }-{\nu }_{\tau }$ oscillations, the see-saw mechanism and the Exact Parity Model
• A texture of neutrino mass matrix in view of recent neutrino experimental results