Experimental probes of localized gravity: On and off the wall - art. no. 075004

The phenomenology of the Randall-Sundrum model of localized gravity is anal yzed in detail for the two scenarios where the standard model (SM) gauge an d matter fields are either confined to a TeV scale 3-brane or may propagate in a slice of five dimensional anti-de Sitter space. In the latter instanc e, we derive the interactions of the graviton, gauger and fermion Kaluza-Kl ein (KK) states. The resulting phenomenological signatures are shown to be highly dependent on the value of the 5-dimensional fermion mass and differ substantially from the case where the SM fields lie on the TeV-brane. In bo th scenarios, we examine the collider signatures for direct production of t he graviton and gauge KK towers as well as their induced contributions to p recision electroweak observables. These direct and indirect signatures are found to play a complementary role in the exploration of the model paramete r space. Tn the case where the SM field content resides on the TeV-brane, w e show thar the CERN LHC san probe the full parameter space and hence will either discover or exclude this model if the scale of electroweak physics o n the 3-brane is less than 10 TeV. We also show that spontaneous electrowea k symmetry breaking of the SM must take place on the TeV-brane.