Dynamical symmetry breaking in Gauge-Higgs unification on orbifold

Abstract

We study the dynamical symmetry breaking in the gauge-Higgs unification of the 5D theory compactified on an orbifold, $S^1/Z_2$. This theory identifies Wilson line degrees of freedoms as ``Higgs doublets''. We consider $SU(3{)}_c\times SU(3{)}_W$ and SU(6) models with the compactification scale of order a few TeV. The gauge symmetries are reduced to $SU(3{)}_c\times SU(2{)}_L\times U(1{)}_Y$ and $SU(3{)}_c\times SU(2{)}_L\times U(1{)}_Y\times U(1)$, respectively, through the orbifolding boundary conditions. We estimate the one loop effective potential of ``Higgs doublets'', and find that the electro-weak breaking is realized through the radiative corrections when there are suitable numbers of bulk fields possessing the suitable representations. The masses of ``Higgs doublets'' are $\mathcal{O}(100)$ GeV in this scenario.

Comments: 18 pages, 8 figures;note added