Investigating Higgs self-interaction through di-Higgs plus jet production

TL;DR

This paper explores di-Higgs plus jet production at hadron colliders to improve the measurement of the Higgs self-coupling, narrowing its allowed range and disfavoring negative couplings at future colliders.

Contribution

It proposes a new collider signature for Higgs self-coupling measurement and demonstrates its potential to significantly refine current constraints.

Findings

Allowed Higgs self coupling range narrowed to [0.5, 1.7]

Negative couplings disfavored beyond 2σ at 100TeV collider

Simulation shows increased discovery sensitivity for Higgs self-interaction

Abstract

The Higgs self coupling measurement is quite essential for determining the shape of the Higgs potential and nature of the Higgs boson. We propose the di-Higgs plus jet final states at hadron colliders to increase the discovery sensitivity of the Higgs self coupling at the low invariant mass region. Our simulation indicates that the allowed region of the Higgs self coupling would be further narrowed from $[-1.5,6.7]$ from the most recent ATLAS report down to $[0.5, 1.7]$. Furthermore, we find negative Higgs self couplings would be disfavored beyond $2\sigma$ confidence level at a future 100TeV collider with the help of this signal.