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Higgs-boson production through gluon fusion at NNLO QCD with parton showers

Stefan Höche, Ye Li, Stefan Prestel

TL;DR

This work delivers the first application of the UN$^2$LOPS NNLO+PS matching to Higgs production through gluon fusion, addressing large higher-order QCD corrections by merging NNLO zero-jet results with one-jet NLO predictions and providing a $q_T$-vetoed NNLO calculation in HEFT. It introduces revised matching schemes, including a factorized hard-function approach, and validates the approach against state-of-the-art NNLO and resummed results, showing good agreement for inclusive and differential observables within expected uncertainties. The study also furnishes an independent, fully differential NNLO calculation that yields event-level outputs and discusses prospects for extending to higher jet multiplicities with NNLO accuracy. Practically, this work enhances the precision and reliability of Higgs-boson event predictions for LHC analyses and lays the groundwork for richer NNLO+PS simulations with multiple jets.

Abstract

We discuss how the UN2LOPS scheme for matching NNLO calculations to parton showers can be applied to processes with large higher-order perturbative QCD corrections. We focus on Higgs-boson production through gluon fusion as an example. We also present an NNLO fixed-order event generator for this reaction.

Higgs-boson production through gluon fusion at NNLO QCD with parton showers

TL;DR

This work delivers the first application of the UNLOPS NNLO+PS matching to Higgs production through gluon fusion, addressing large higher-order QCD corrections by merging NNLO zero-jet results with one-jet NLO predictions and providing a -vetoed NNLO calculation in HEFT. It introduces revised matching schemes, including a factorized hard-function approach, and validates the approach against state-of-the-art NNLO and resummed results, showing good agreement for inclusive and differential observables within expected uncertainties. The study also furnishes an independent, fully differential NNLO calculation that yields event-level outputs and discusses prospects for extending to higher jet multiplicities with NNLO accuracy. Practically, this work enhances the precision and reliability of Higgs-boson event predictions for LHC analyses and lays the groundwork for richer NNLO+PS simulations with multiple jets.

Abstract

We discuss how the UN2LOPS scheme for matching NNLO calculations to parton showers can be applied to processes with large higher-order perturbative QCD corrections. We focus on Higgs-boson production through gluon fusion as an example. We also present an NNLO fixed-order event generator for this reaction.

Paper Structure

This paper contains 7 sections, 13 equations, 3 figures, 1 table.

Table of Contents

  1. Introduction
  2. UN$^2$LOPS matching
  3. The $\mathbf{q_T}$-vetoed NNLO calculation
  4. UN$^2$LOPS in Higgs-boson production
  5. Results
  6. Conclusions
  7. UN$^2$LOPS step-by-step

Figures (3)

  • Figure 1: Rapidity spectrum (left) and transverse momentum spectrum (right) of the Higgs boson, computed at fixed order and compared between Sherpa and HNNLO.
  • Figure 2: Rapidity spectrum of the Higgs boson in individual matching (left) and factorized matching (right). See Sec. \ref{['sec:higgs']} for details.
  • Figure 3: Transverse momentum spectrum of the Higgs boson in individual matching (left) and factorized matching (right). See Sec. \ref{['sec:higgs']} for details.