$h \rightarrow \gamma\gamma$ excess and Dark Matter from Composite Higgs Models

TL;DR

This paper explores a non-minimal composite Higgs model based on the coset SO(7)/G2, which can explain the Higgs diphoton excess and provide a dark matter candidate through additional pseudo-Goldstone bosons.

Contribution

It introduces a specific composite Higgs model with new pseudo-Goldstone bosons that account for the diphoton excess and dark matter, extending previous models.

Findings

The model naturally explains the Higgs diphoton excess.

It provides a viable dark matter candidate.

The model aligns with recent collider data.

Abstract

Composite Higgs Models are very appealing candidates for a natural realization of electroweak symmetry breaking. Non minimal models could explain the recent Higgs data from ATLAS, CMS and Tevatron experiments, including the excess in the amount of diphoton events, as well as provide a natural dark matter candidate. In this article, we study a Composite Higgs model based on the coset $SO(7)/G2$. In addition to the Higgs doublet, one $SU(2)_L$ singlet of electric charge one, $\kappa^\pm$, as well as one singlet $\eta$ of the whole Standard Model group arise as pseudo-Goldstone bosons. $\kappa^\pm$ and $\eta$ can be responsible of the diphoton excess and dark matter respectively.