Warped 5D Standard Model Consistent with EWPT

TL;DR

This paper proposes a simplified 5D Standard Model with a warped background and a bulk Higgs, compatible with electroweak precision tests, allowing KK modes within LHC reach without requiring enlarged gauge symmetry.

Contribution

It introduces a simpler 5D Standard Model with a non-AdS warped background and bulk Higgs, avoiding the need for extended gauge symmetry to satisfy EWPT constraints.

Findings

KK modes can be within LHC reach.

Model remains consistent with EWPT.

No need for enlarged gauge symmetry.

Abstract

For a 5D Standard Model propagating in an AdS background with an IR localized Higgs, compatibility of bulk KK gauge modes with EWPT yields a phenomenologically unappealing KK spectrum (m > 12.5 TeV) and leads to a "little hierarchy problem". For a bulk Higgs the solution to the hierarchy problem reduces the previous bound only by sqrt(3). As a way out, models with an enhanced bulk gauge symmetry SU(2)_R x U(1)_(B-L) were proposed. In this note we describe a much simpler (5D Standard) Model, where introduction of an enlarged gauge symmetry is no longer required. It is based on a warped gravitational background which departs from AdS at the IR brane and a bulk propagating Higgs. The model is consistent with EWPT for a range of KK masses within the LHC reach.