Phenomenology of the Randall-Sundrum Gauge Hierarchy Model

Abstract

We explore the phenomenology associated with the recently proposed localized gravity model of Randall and Sundrum where gravity propagates in a 5-dimensional non-factorizable geometry and generates the 4-dimensional weak-Planck scale hierarchy by an exponential function of the compactification radius, called a warp factor. The Kaluza-Klein tower of gravitons which emerge in this scenario have strikingly different properties than in the factorizable case with large extra dimensions. We derive the form of the graviton tower interactions with the Standard Model fields and examine their direct production in Drell-Yan and dijet events at the Tevatron and LHC as well as the KK spectrum line-shape at high-energy linear e + e − colliders. In the case where the first KK excitation is observed, we outline the procedure to uniquely determine the parameters of this scenario. We also investigate the effect of KK tower exchanges in contact interaction searches. We find that present experiments can place meaningful constraints on the parameters of this model.

Randall–Sundrum reality at the LHC

“…By taking kL ≃ 35, the fundamental scale M 5 =M P l is scaled down to the TeV scale. In order to suppress unwanted higher dimensional operators, which are not sufficiently suppressed by the TeV-scale cutoff on the IR brane in the RS1 model, SM gauge fields [2,3,4,5] and fermions [6,7] are considered to propagate in the bulk space. In this new setup [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16], denoted as the RS model, RS can address both the hierarchy problem and fermion mass hierarchies.…”

“…In order to suppress unwanted higher dimensional operators, which are not sufficiently suppressed by the TeV-scale cutoff on the IR brane in the RS1 model, SM gauge fields [2,3,4,5] and fermions [6,7] are considered to propagate in the bulk space. In this new setup [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16], denoted as the RS model, RS can address both the hierarchy problem and fermion mass hierarchies. From the electroweak precision measurements and various flavor physics, the new Kaluza-Klein (KK) modes of the bulk SM fields are constrained to be heavier than a few TeV [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23].…”

Search for Heavy Resonances in the Dimuon Channel with the DØ Detector

“…Discovering and measuring the properties of the first resonance G [1] would allow the determination of all parameters in the model [45].…”

“…The theory has 2 free parameters; these are usually taken to be the mass of the lightest massive graviton, M G [1] and k M Pl . A realization of the RS model in string theory restricts the value of k M Pl to be greater than 0.01 (see [45]). Requiring the curvature of the extra dimension to be less than the 5-dimensional Planck scale restricts k M Pl to be less than ≈ 0.1 (see [46,47]).…”

Big signals of Little Randall–Sundrum models

“…For kr c ≈ 12, the Planckweak hierarchy is then generated . The distinct signature of this model is weak scale spin-2 Kaluza-Klein (KK) excitations of the graviton, appearing as resonances in high energy collisions [2]. However, the cutoff scale in the 4D effective theory is also red-shifted to near the weakscale, leading to unsuppressed higher dimensional operators, such as those for unwanted flavor-changing neutral currents.…”