Dynamical Electroweak Symmetry Breaking in $SO(5)\times U(1)$ Gauge-Higgs Unification in the Randall-Sundrum Warped Space

In the gauge-Higgs unification scenario the Higgs field is unified with gauge fields in higher dimensional gauge theory. The 4D Higgs field $H(x)$ corresponds to 4D fluctuations of the Aharonov-Bohm phase (Wilson line phase) ${\theta }_H$ in the extra-dimension. An $SO(5)\times U(1)$ gauge-Higgs unification model in the Randall-Sundrum warped spacetime with top and bottom quarks is presented. Gauge couplings of the top quark multiplet induce electroweak symmetry breaking by the Hosotani mechanism. The effective potential $V_{\text{eff}}({\theta }_H)$ is found to be minimized at $\theta_H = \onehalf \pi$andtheHiggsmassispredictedaround50GeV\mathrm{.}The$ZZH$and$WWH$couplingsvanishat$\theta_H = \onehalf \pi$ so that the LEP2 bound for the Higgs mass is evaded. The result is summarized in the effective interactions for ${\widehat{\theta }}_H(x)={\theta }_H+H(x)\mathrm{/}{f}_H$.