New Dimensions for Randall-Sundrum Phenomenology

TL;DR

This paper explores a six-dimensional extension of the Randall-Sundrum model, introducing new gauge Kaluza-Klein states with unique properties and collider signatures, influenced by fermion localization in the extra dimensions.

Contribution

It presents a minimal 6D RS model with gauge fields propagating in an additional dimension, analyzing the resulting KK states and their phenomenology, which differs from 5D models.

Findings

New KK gauge states appear near TeV scale.

Couplings depend strongly on fermion localization.

Collider signatures are sensitive to fermion geography.

Abstract

We consider a 6D extension of the Randall-Sundrum (RS) model, RS6, where the Standard Model (SM) gauge fields are allowed to propagate in an additional dimension, compactified on $S^1$ or $S^1/Z_2$. In a minimal scenario, fermions propagate in the 5D RS subspace and their localization provides a model of flavor. New Kaluza-Klein (KK) states, corresponding to excitations of the gauge fields along the 6th dimension, appear near the TeV scale. The new gauge KK modes behave differently from those in the 5D warped models. These RS6 states have couplings with strong dependence on 5D field localization and, within the SM, only interact with heavy fermions and the Higgs sector, to a very good approximation. Thus, the collider phenomenology of the new gauge KK states sensitively depends on the 5D fermion geography. We briefly discuss inclusion of SM fermions in all 6 dimensions, as well as the possibility of going beyond 6D.