Corrections to di-Higgs boson production with light stops and modified Higgs couplings

TL;DR

This paper investigates how light stops and altered Higgs couplings in supersymmetry models can significantly modify di-Higgs production rates at colliders, highlighting correlations with single Higgs production and the impact of coupling modifications.

Contribution

It provides a detailed analysis of supersymmetric effects on di-Higgs production, including the interplay of stop contributions and Higgs coupling modifications, with implications for collider experiments.

Findings

Supersymmetric contributions can significantly alter di-Higgs production rates.

Modifications of Higgs couplings and light stops are strongly correlated with single Higgs production.

Small changes in top Yukawa coupling can cause large increases in di-Higgs production.

Abstract

The Higgs pair production in gluon fusion is a sensitive probe of beyond-Standard Model (BSM) phenomena and its detection is a major goal for the LHC and higher energy hadron collider experiments. In this work we reanalyze the possible modifications of the Higgs pair production cross section within low energy supersymmetry models. We show that the supersymmetric contributions to the Higgs pair production cross section are strongly correlated with the ones of the single Higgs production in the gluon fusion channel. Motivated by the analysis of ATLAS and CMS Higgs production data, we show that the scalar superpartners' contributions may lead to significant modification of the di-Higgs production rate and invariant mass distribution with respect to the SM predictions. We also analyze the combined effects on the di-Higgs production rate of a modification of the Higgs trilinear and top-quark Yukawa couplings in the presence of light stops. In particular, we show that due to the destructive interference of the triangle and box amplitude contributions to the di-Higgs production cross section, even a small modification of the top-quark Yukawa coupling can lead to a significant increase of the di-Higgs production rate.