Fermion Masses and Mixings in GUTs with Non-Canonical U(1)Y
Abstract
We discuss fermion masses and mixings in models derived from orbifold GUTs such that gauge coupling unification is achieved without low energy supersymmetry by utilizing a non-canonical U(1)Y. A gauged U(1)X flavor symmetry plays an essential role, and the Green-Schwarz mechanism is invoked in anomaly cancellations. Models containing vector-like particles with masses close to MGUT are also discussed.
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