  We construct realistic theories in which the Higgs fields arise from extra
dimensional components of higher dimensional gauge fields. In particular, we
present a minimal 5D SU(3)_C x SU(3)_W model and a unified 5D SU(6) model. In
both cases the theory is reduced to the minimal supersymmetric standard model
below the compactification scale, with the two Higgs doublets arising from the
5D gauge multiplet. Quarks and Leptons are introduced in the bulk, giving
Yukawa couplings without conflicting with higher dimensional gauge invariance.
Despite the fact that they arise from higher dimensional gauge interactions,
the sizes of these Yukawa couplings can be different from the 4D gauge
couplings due to wave-function profiles of the matter zero modes determined by
bulk mass parameters. All unwanted fields are made heavy by introducing
appropriate matter and superpotentials on branes, which are also the source of
intergenerational mixings in the low-energy Yukawa matrices. The theory can
accommodate a realistic structure for the Yukawa couplings as well as small
neutrino masses. Scenarios for supersymmetry breaking and the mu-term
generation are also discussed.

High Energy Physics - Phenomenology;High Energy Physics - Theory