# Di-higgs enhancement by neutral scalar as probe of new colored sector

## TL;DR

This paper explores how an extra neutral scalar, produced via gluon fusion through new colored particles, can enhance Higgs pair production and potentially explain an observed excess at the LHC.

## Contribution

It proposes a model where a neutral scalar enhances di-Higgs production via colored particles and analyzes its experimental constraints and future collider prospects.

## Key findings

- Potential explanation for the ATLAS $b\bar{b}\gamma\gamma$ excess as a 300 GeV scalar resonance.
- Enhanced di-Higgs production signals at future colliders.
- Constraints from current LHC data on the model parameters.

## Abstract

We study a class of models in which the Higgs pair production is enhanced at hadron colliders by an extra neutral scalar. The scalar particle is produced by the gluon fusion via a loop of new colored particles, and decays into di-Higgs through its mixing with the Standard Model Higgs. Such a colored particle can be the top/bottom partner, such as in the dilaton model, or a colored scalar which can be triplet, sextet, octet, etc., called leptoquark, diquark, coloron, etc., respectively. We examine the experimental constraints from the latest Large Hadron Collider (LHC) data, and discuss the future prospects of the LHC and the Future Circular Collider up to 100TeV. We also point out that the 2.4$\sigma$ excess in the $b\bar b\gamma\gamma$ final state reported by the ATLAS experiment can be interpreted as the resonance of the neutral scalar at 300GeV.