large Lepton Flavor Mixing and E_6-Type Unification Models

概要

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There are experimental indications of large flavor mixing between ν_μ and ν_τ. In the unification models, in which the massless sector includes extra particles beyond the standard model, there possibly appear mixings between quarks (leptons) and extra particles. When large mixings occur, lepton flavor mixings can be quite different from quark flavor mixings. By studying the string inspired SU(6) × SU(2)_R model with global flavor symmetries, we obtain the neutrino flavor mixing sin θ_<23> 〜λ= sin θ_C up to renormalization effects. It can be expected that due to large Yukawa couplings of the third generation, the renormalization effect increases sin 2θ_<23> naturally up to 〜 1 at the electroweak scale. The fermion mass spectra and the CKM matrix of quarks obtained in this paper are also phenomenologically viable.
理論物理学刊行会の論文
1998-05-25