  The mass spectra of the standard model particles are reproduced in the
$SO(11)$ gauge-Higgs grand unification in the six-dimensional warped space
without introducing exotic light fermions. Light neutrino masses are explained
by the gauge-Higgs seesaw mechanism. We evaluate the effective potential of the
4d Higgs boson appearing as a fluctuation mode of the Aharonov-Bohm phase
$\theta_H$ in the extra-dimensioal space, and show that the dynamical
electroweak symmetry breaking takes place with the Higgs boson mass $m_H \sim
125\,$GeV and $\theta_H \sim 0.1$. The Kaluza-Klein mass scale in the fifth
dimension is approximately given by $m_{\rm KK} \sim 1.230\,{\rm TeV}/\sin
\theta_H$.

High Energy Physics - Phenomenology;High Energy Physics - Theory