Higgs pair production via gluon fusion in the Two-Higgs-Doublet Model

TL;DR

This paper provides NLO QCD predictions for Higgs pair production via gluon fusion in the Two-Higgs-Doublet Model, highlighting the impact of model-specific features on production rates and distributions at the LHC.

Contribution

It introduces a detailed NLO calculation for Higgs pair production in the 2HDM, including a reweighting technique and analysis of various model scenarios.

Findings

NLO corrections significantly increase predicted cross sections.

Model-specific features alter Higgs pair production rates and distributions.

Theoretical uncertainties are substantially reduced with NLO calculations.

Abstract

We study the production of Higgs boson pairs via gluon fusion at the LHC in the Two-Higgs-Doublet Model. We present predictions at NLO accuracy in QCD, matched to parton showers through the MC@NLO method. A dedicated reweighting technique is used to improve the NLO calculation upon the infinite top-mass limit. We perform our calculation within the MadGraph5_aMC@NLO framework, along with the 2HDM implementation based on the NLOCT package. The inclusion of the NLO corrections leads to large K-factors and significantly reduced theoretical uncertainties. We examine the seven 2HDM Higgs pair combinations using a number of representative 2HDM scenarios. We show how the model-specific features modify the Higgs pair total rates and distribution shapes, leading to trademark signatures of an extended Higgs sector.