Higgs Couplings and Phenomenology in a Warped Extra Dimension

TL;DR

This paper analyzes Higgs boson couplings within Randall-Sundrum models, comparing theoretical predictions with LHC data, and explores the potential for future collider experiments to probe these models.

Contribution

It provides analytic expressions for Higgs couplings in RS models and assesses their experimental constraints and future sensitivities.

Findings

Current LHC data exclude KK gluon masses up to 20 TeV for certain Yukawa couplings.

The analysis constrains RS model parameters using Higgs decay measurements.

Future colliders could significantly improve the sensitivity to RS model signatures.

Abstract

We present a comprehensive description of the Higgs-boson couplings to Standard Model fermions and bosons in Randall-Sundrum (RS) models with a Higgs sector localized on or near the infra-red brane. The analytic results for all relevant Higgs couplings including the loop-induced couplings to gluons and photons are summarized for both the minimal and the custodial RS model. The RS predictions for all relevant Higgs decays are compared with current LHC data, which already exclude significant portions of the parameter space. We show that the latest measurements are sensitive to KK gluon masses up to $20\, \rm{TeV} \times (y_*/3)$ at $95\%$ confidence level for anarchic 5D Yukawa couplings bounded from above by $|(Y_f)_{ij}| < y_*$. We also derive the sensitivity levels attainable in the high-luminosity run of the LHC and at a future linear collider.