Phenomenology of the radion in the Randall-Sundrum scenario at colliders

Phenomenology of a radion (/φ) that stabilizes the modulus in the Randall-Sundrum scenario is considered. The radion couples to the trace of energy momentum tensor of the standard model (SM) with a strength suppressed only by a new scale (Λ_φ) of an order of the electroweak scale. In particular, the effective coupling of a radion to two gluons is enhanced due to the trace anomaly of QCD. Therefore, its production cross section at hadron colliders could be enhanced, and the dominant decay mode of a relatively light radion is /φ-->gg, unlike the SM Higgs boson case. We also present constraints on the mass m_φ and the new scale Λ_φ from the Higgs search limit at LEP and perturbative unitarity bound.