# Scherk-Schwarz orbifolds at the LHC

## TL;DR

This paper investigates orbifold Grand Unification models with Scherk-Schwarz twisting, analyzing their viability under LHC constraints and finding it challenging to achieve a suitable Higgs mass.

## Contribution

It provides a detailed renormalisation group analysis of orbifold GUT models with Scherk-Schwarz twisting and assesses their compatibility with experimental data.

## Key findings

- Minimal SU(5) models are ruled out by constraints.
- Adding extra fields or symmetries does not easily solve the Higgs mass issue.
- Models struggle to satisfy both Higgs mass requirements and LHC search constraints.

## Abstract

We examine orbifold theories of Grand Unification with Scherk-Schwarz twisting, performing a renormalisation group analysis and applying low energy experimental constraints. We rule out the minimal SU(5) models, and consider simple extensions including additional fields, such as an additional scalar field, or additional symmetries, such as $SU(5)\times U(1)$ or $E_6$. We find that it is very difficult to generate a large enough Higgs mass while simultaneously passing LHC experimental search constraints.