# Light scalars in composite Higgs models

## TL;DR

This paper reviews the theoretical basis and collider phenomenology of light scalar states in composite Higgs models, updating experimental bounds and future detection prospects at the LHC and HL-LHC.

## Contribution

It provides a comprehensive review of light scalars in composite Higgs models and updates collider search bounds with recent LHC data.

## Key findings

- Light scalars are a common feature in composite Higgs models.
- Current LHC data constrains the parameter space of these models.
- Future collider runs could potentially discover or further constrain these states.

## Abstract

A composite Higgs boson is likely to be accompanied by additional light states generated by the same dynamics. This expectation is substantiated when realising the composite Higgs mechanism by an underlying gauge theory. We review the dynamics of such objects, which may well be the first sign of compositeness at colliders. We also update our previous analysis of the bounds from LHC searches to the latest results, and discuss the projected reach of the High-Luminosity run.