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【Abstract】

The Gauge-Higgs Unification (GHU) is one of the possibilities to solve the gauge hierarchy problem and has been studied from various aspects. In the GHU, the Higgs boson is the extra-dimensional component of the gauge boson, and the quantum correction to the mass of the Higgs boson is suppressed due to gauge symmetry. I proposed an SO(11) gauge-Higgs grand unified theory (GHGUT) that combines GHU and grand unified theory (GUT). Since then, I have been studying both formal and phenomenological aspects of GHU. On the phenomenological side, I have constructed an SU(3) x SO(5) x U(1) GHU model consistent with the SO(11) GHGUT and am also studying the experimental testability of this model. In this seminar, I will give an overview of the the GHGUT and the effective model. Then I will show the constraints on the new physics scale from the current LHC experiments and describe the search for new physics in a future electron-positron linear collider experiment with polarized electron beams and positron beams.