Triple Higgs Boson Coupling in Gauge-Higgs Unification

We consider the triple coupling of the Higgs boson in the context of the gauge-Higgs unification scenario. We show that the triple coupling of the Higgs boson in this scenario generically deviates from SM prediction since the Higgs potential in this scenario has a periodicity. We calculate the coupling in the five-dimensional $SU(3)$ x $U(1{)}_X$ gauge-Higgs unification model and obtain 70% deviation from the SM prediction.