Abstract
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 μν (n) -h-φ. We study this vertex in the process e + e - → h φ, which is allowed only with a nonzero 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 that the LEP or LEP II data cannot constrain. © 2003 The American Physical Society.