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The gauge couplings $WWZ$, $WWWW$, and $WWZZ$ in the gauge-Higgs unificationscenario in the Randall-Sundrum warped spacetime remain almost universal as inthe standard model, but substantial deviation results for the Higgs couplings.In the $SO(5)\times U(1)_{B-L}$ model, the couplings $WWH$ and $ZZH$ aresuppressed by a factor $\cos \theta_H$ from the values in the standard model,while the bare couplings $WWHH$ and $ZZHH$ are suppressed by a factor$1-(2/3)\sin^2 \theta_H$. Here $\theta_H$ is the Yang-Mills AB phase (Wilsonline phase) along the fifth dimension, which characterizes the electroweaksymmetry breaking. The suppression can be used to test the gauge-Higgsunification scenario at LHC and ILC. It is also shown that the $WWZ$ couplingin flat spacetime deviates from the standard model value at moderate values of$\theta_H$, contradicting with the LEP2 data.Comment: 34 pages, 3 eps files, published versio

Anomalous Higgs Couplings in the SO(5) x U(1)B-L Gauge-Higgs Unification in Warped Spacetime