E6 Unification, Large Neutrino Mixings and SUSY Flavor Problem
TLDR
In this article, a hierarchical structure of up-quark-type Yukawa couplings is given as a basic structure of flavor, and lepton mixings that are larger than the quark mixings and downquark type (and charged-lepton-type) mass hierarchies that are milder than the up quark type mass hierarchy can generically be obtained under a few natural assumptions.Abstract:
The results of this study indicate that in E 6 grand unified theories (GUTs), once a hierarchical structure of up-quark-type Yukawa couplings is given as a basic structure of flavor, lepton mixings that are larger than the quark mixings and down-quark-type (and charged-lepton-type) mass hierarchies that are milder than the 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 E 6 structure, which realizes bi-large neutrino mixings, also solves a problem that results from the large neutrino mixing angles.read more
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F-theory family unification
TL;DR: In this paper, a new geometric mechanism for naturally realizing unparallel three families of flavors in string theory, using the framework of F-theory, was proposed, where a set of coalesced local 7-branes of a particular Kodaira singularity type were allowed to bend and separate from the rest, so that they meet only at an intersection point.
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LHC signature of supersymmetric models with non-universal sfermion masses
Sung-Gi Kim,Nobuhiro Maekawa,Keiko I. Nagao,Mihoko M. Nojiri,Mihoko M. Nojiri,Kazuki Sakurai +5 more
TL;DR: In this article, the LHC signature of the minimal supersymmetric standard model with non-universal sfermion masses is studied, which is motivated not only from flavor, CP and naturalness constraints but also from the E6 grand unified model with a non-Abelian horizontal symmetry.
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F-theory Family Unification
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Chiral generations on intersecting 5-branes in heterotic string theory
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