RADION PHENOMENOLOGY IN THE RANDALL SUNDRUM SCENARIO

Phenomenology of a radion (ɸ) in the Randall-Sundrum scenario is discussed. The radion couples to the trace of energy momentum tensor of the standard model with a strength suppressed only by a new scale (Λ_ɸ) which is 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 ɸ → gg, unlike the SM Higgs boson case. We also present constraints on the mass m_ɸ and the new scale Λ_ɸ from the Higgs search limit at LEP, perturbative unitarity bound and the stability of the radion/Higgs potential under radiative corrections.