E6 Unification, Large Neutrino Mixings, and SUSY Flavor Problem

Details E6 Unification, Large Neutrino Mixings, and SUSY Flavor Problem E6 Unification, Large Neutrino Mixings, and SUSY Flavor Problem

2004-02-22

arxiv.org/abs/hep-ph/0402224v3

Prog.Theor.Phys. 112 (2004) 639-652

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, RevTeX, In Ver.2, refs. and minor corrections

Scientific paper

10.1143/PTP.112.639

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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