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 $SO\left(11\right)$ 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 $m_H\sim 125$GeV and ${\theta }_H\sim 0.1$. The Kaluza-Klein mass scale in the fifth dimension is approximately given by $m_{KK}\sim 1.230TeV/\sin {\theta }_H$.