# Composite 2HDM with singlets: a viable dark matter scenario

## TL;DR

This paper explores a non-minimal composite Higgs model with an SO(7) symmetry that results in a Two-Higgs doublet model with singlets, providing a viable dark matter candidate consistent with relic density and experimental constraints.

## Contribution

It introduces a novel composite 2HDM with singlets derived from an SO(7) symmetry breaking, demonstrating its viability as a dark matter scenario.

## Key findings

- The model can reproduce correct dark matter relic density via thermal freeze-out and late decay.
- It can evade current experimental constraints with minimal fine-tuning.
- The model aligns with electroweak precision tests.

## Abstract

We study the non-minimal composite Higgs model with global symmetry $\text{SO}(7)$ broken to $\text{SO}(5)\times \text{SO}(2)$. The model results in a composite Two-Higgs doublet model (2HDM) equipped with two extra singlets, the lightest of which can be a viable dark matter candidate. The model is able to reproduce the correct dark matter relic density both via the usual thermal freeze-out and through late time decay of the heavier singlet. In the case of thermal freeze-out, it is possible to evade current experimental constraints even with the minimum fine tuning allowed by electroweak precision tests.