## Coupling unifications in gauge-Higgs unified orbifold models

Supersymmetric gauge theories, in higher dimensions compactified in an orbifold, give a natural framework to unify the gauge bosons, Higgs fields, and even the matter fields in a single multiplet of the unifying gauge symmetry. The extra dimensions and the supersymmetry are the two key ingredients for such an unification. In this work, we investigate various scenarios for the unification of the three gauge couplings and the Yukawa couplings in the minimal supersymmetric standard model (MSSM), as well as the trilinear Higgs couplings {lambda} and {kappa} of the nonminimal supersymmetric standard model (NMSSM). We present an SU(8) model in sixmore »