Non-custodial warped extra dimensions at the LHC

TL;DR

This paper explores a non-custodial warped extra dimension model, analyzing electroweak precision, fermion mass-Yukawa misalignments, and potential collider signatures, highlighting its testability at current and future colliders.

Contribution

It provides a detailed analysis of the non-custodial Randall-Sundrum model with bulk Standard Model fields, including electroweak constraints and Yukawa coupling deviations.

Findings

Kaluza-Klein gauge bosons could be as light as 5 TeV, detectable at the LHC.

Top Yukawa coupling deviations can reach 10%, observable at HL-LHC.

Corrections to bottom and tau Yukawas are at percent level, detectable at future colliders.

Abstract

With the prospect of improved Higgs measurements at the LHC and at proposed future colliders such as ILC, CLIC and TLEP we study the non-custodial Randall-Sundrum model with bulk SM fields and compare brane and bulk Higgs scenarios. We compute the electroweak precision observables and argue that incalculable contributions to these, in the form of higher dimensional operators, could have a non-negligable impact. This could potentially reduce the bound on the lowest Kaluza-Klein gauge boson masses to the 5 TeV range, making these states detectable at the LHC. In a second part, we compute the misalignment between fermion masses and Yukawa couplings caused by vector-like Kaluza-Klein fermions. The deviation of the top Yukawa can easily reach 10%, making it observable at the high-luminosity LHC. Corrections to the bottom and tau Yukawa couplings can be at the percent level and detectable at ILC, CLIC or TLEP.