E6 Unification, Large Neutrino Mixings, and SUSY Flavor Problem

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.

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

Cited by in corpus (22)

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• Prospects for New Physics from gauge Left-Right-Colour-Family Grand Unification hypothesis
• E6 grand unified theory with three generations from heterotic string
• F-theory Family Unification
• Neutrino mixing and CP violation from Dirac-Majorana bimaximal mixture and quark-lepton unification
• Flavor structure of E6 GUT models
• Constraint from recent ATLAS results on non-universal sfermion mass models and naturalness
• Heterotic E6 GUTs and Partition Functions
• Chiral Generations on Intersecting 5-branes in Heterotic String Theory
• Cosmological Constant in a Model with Superstring-Inspired E_6 Unification and Shadow Theta-Particles
• Leptogenesis in $E_6\times U(1{)}_A$ SUSY GUT model
• Lepton Flavor Violation in SUSY GUT Model with Non-universal Sfermion Masses
• Spontaneous CP violation in E6 SUSY GUT with SU(2) flavor and anomalous U(1) symmetries
• Mirror World with Broken Mirror Parity, E(6) Unification and Cosmology
• Spontaneous SUSY breaking with anomalous U(1) symmetry in metastable vacua and moduli stabilization
• Nucleon decay via dimension-6 operators in $E_6\times SU(2{)}_F\times U(1{)}_A$ SUSY GUT model
• Neutrino properties in E6 x SU(2)F SUSY GUT with spontaneous CP violation
• Neutralino Dark Matter in minimal supersymmetric standard model with natural light Higgs sector
• Seesaw scales and the steps from the Standard Model towards superstring-inspired flipped E_6
• Constraints of chromoelectric dipole moments to natural SUSY type sfermion spectrum
• Sizable D-term contribution as a signature of $E_6\times SU(2{)}_F\times U(1{)}_A$ SUSY GUT model
• Heavy gravitino, naturalness, and sizable anomaly mediation