SMEFT predictions for $gg\to hh$ at full NLO QCD and truncation uncertainties

TL;DR

This paper calculates full NLO QCD corrections for Higgs pair production via gluon fusion within SMEFT, analyzing effects of EFT truncation and operator insertions on cross-sections and distributions at 13 TeV.

Contribution

It provides the first comprehensive NLO QCD calculation for SMEFT Higgs pair production including EFT truncation effects and operator insertions.

Findings

NLO corrections significantly affect Higgs pair production predictions.

EFT truncation choices impact cross-section and distribution results.

Implementation of corrections in the ggHH_SMEFT generator enhances simulation accuracy.

Abstract

We present a calculation of the NLO QCD corrections for Higgs-boson pair production in gluon fusion including effects of anomalous couplings within Standard Model Effective Field Theory (SMEFT). We study effects of different truncation options of the EFT expansion in $1/\Lambda$ and of double operator insertions, both at total cross-section level as well as for the distribution of the invariant mass of the Higgs-boson pair, at $\sqrt{s}=13$ TeV. The NLO corrections are implemented in the generator $\texttt{ggHH_SMEFT}$ in the $\texttt{Powheg-Box-V2}$ framework.