Electroweak symmetry breaking and mass spectra in six-dimensional gauge-Higgs grand unification

The mass spectra of the standard model particles are reproduced in the SO(11) gauge-Higgs grand unification in 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 four-dimensional Higgs boson appearing as a fluctuation mode of the Aharonov-Bohm phase theta(H) in the extra-dimensional space, and show that the dynamical electroweak symmetry breaking takes place with the Higgs boson mass mH similar to 125 GeV and theta(H) similar to 0.1. The Kaluza-Klein mass scale in the fifth dimension is approximately given by m(KK) similar to 1.230 TeV/sin theta(H).