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arXiv · hep-ph/0402224

E6 Unification, Large Neutrino Mixings, and SUSY Flavor Problem

Nobuhiro Maekawa
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Abstract

This study indicates that in E6 grand unified theories (GUTs), once a hierarchical structure of up-quark-type Yukawa couplings is given as a basic structure of flavor, larger lepton mixings than the quark mixings and milder down-quark-type (and charged-lepton-type) mass hierarchies than up-quark-type mass hierarchy can generically be obtained under a few natural assumptions. The basic flavor structure is compatible with non-Abelian horizontal symmetry, which can solve the SUSY flavor problem. It is shown that in solving the SUSY flavor problem, the E6 structure, which realizes bi-large neutrino mixings, also solves a problem that results from the large neutrino mixing angles.

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Nobuhiro Maekawa. 2004-03-30. E6 Unification, Large Neutrino Mixings, and SUSY Flavor Problem. https://doi.org/10.1143/ptp.112.639

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