A probe of the Radion-Higgs mixing in the Randall-Sundrum model at e+e− colliders

In the Randall-Sundrum model, the radion-Higgs mixing is weakly suppressed by the effective electroweak scale. A novel feature of the existence of gravity-scalar mixing would be a sizable three-point vertex, h (n) μν -h-φ. We study this vertex in the process e+e− → h μν → hφ, which is allowed only with a non-zero radion-Higgs mixing. It is shown that the angular distribution is a unique characteristic of the exchange of massive spin-2 gravitons, and the total cross section at the future e+e− colliders is big enough to cover a large portion of the parameter space where the LEP/LEP II data cannot constrain.