# Composite Higgs theory

## TL;DR

This paper reviews composite Higgs models where the Higgs boson emerges as a pseudo-Nambu-Goldstone boson, discussing constraints from experiments, collider searches, and implications for top partners and flavor physics.

## Contribution

It provides a comprehensive overview of constraints on minimal composite Higgs models, including experimental bounds and theoretical considerations for light top partners.

## Key findings

- Electroweak precision tests impose significant constraints
- LHC searches restrict resonance parameters
- Light top partners pose challenges and have flavor implications

## Abstract

I review the idea of realizing the Higgs as a composite pseudo-Nambu-Goldstone boson of a new strongly-interacting sector and collect major constraints on the parameter space of minimal models. Besides limits from electroweak precision tests, LHC searches for resonances and bounds due to Higgs-coupling modifications will be discussed in detail. Finally, the issue of light top partners in these models will be explored, including ways to avoid them which lead to interesting implications for flavor observables.