Combining chromomagnetic and four-fermion operators with leading SMEFT operators for $gg\to hh$ at NLO QCD

TL;DR

This paper calculates the effects of chromomagnetic and four-fermion operators in SMEFT on Higgs pair production via gluon fusion, including full NLO QCD corrections, providing a unified framework for analysis.

Contribution

It introduces a comprehensive calculation of subleading SMEFT operators' effects on Higgs pair production at NLO QCD, integrated into a unified simulation framework.

Findings

Operators significantly affect the Higgs pair production cross section.

Invariant mass distribution is sensitive to these operators.

The implementation facilitates future phenomenological studies.

Abstract

We present the calculation of the contribtuions from the chromomagnetic and four-top-quark-operators within Standard Model Effective Field Theory (SMEFT) to Higgs boson pair production in gluon fusion, combined with full NLO QCD corrections. We study the effects of these operators on the total cross section and the invariant mass distribution of the Higgs-boson pair, at $\sqrt{s}=13.6$ TeV. These subleading operators are implemented in the generator ggHH_SMEFT, in the same Powheg-Box-V2 framework as the leading operators, such that their effects can be easily studied in a unified setup.