Gravity and Electroweak Symmetry Breaking in a RSI/RSII Hybrid Model

TL;DR

This paper introduces a hybrid RSI/RSII model that addresses the hierarchy problem, stabilizes the radion, and incorporates bulk gauge fields to modify electroweak symmetry breaking, resulting in reduced S parameter and accessible new gauge bosons.

Contribution

It develops a novel hybrid extra-dimensional model combining RSI and RSII features with bulk gauge fields to improve electroweak precision and phenomenology.

Findings

Successfully stabilizes the radion mode.

Reduces the S parameter by approximately 60%.

Predicts new gauge bosons below 1800 GeV.

Abstract

We present a hybrid RSI/RSII model in which we both solve the hierarchy problem and produce a continuum of KK graviton modes. In this model, four dimensional gravity can be reproduced and the radion mode can be stabilized. We then modify the hybrid gravity model to include SU(2)_L x SU(2)_R x U(1)_(B-L) bulk gauge fields. Electroweak symmetry is broken by the choice of appropriate boundary conditions. By adjusting the size of one region of the extra dimension, we show that the S parameter can be decreased while protecting the rho parameter from corrections. We find that as the S parameter is decreased by ~ 60%, M_Z' and M_W' stay below 1800 GeV, protecting unitarity.