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Parton showering effects in central heavy-boson hadroproduction

M. Deak, A. Grebenyuk, F. Hautmann, H. Jung, K. Kutak

TL;DR

The paper addresses how noncollinear, high-energy QCD radiation influences heavy-boson production at the LHC by exploring corrections to collinear parton showers and employing unintegrated gluon densities. It compares $k_ot$-shower approaches to traditional collinear showers, demonstrating improved descriptions of jet correlations and enhanced soft activity in central scalar-boson production. The findings indicate that shower modeling and multi-parton interactions jointly shape the underlying event and minijet distributions, with implications for Monte Carlo tuning and Higgs phenomenology. The work advocates a transverse-momentum dependent shower framework as a broader extension to conventional parton showers, applicable to both scalar and vector boson processes.

Abstract

If large-angle multigluon radiation contributes significantly to parton showers associated with heavy boson production at the LHC, appropriate parton branching methods are required for realistic Monte Carlo simulations of final states. We report on a study illustrating such effects in the case of central scalar-boson production. We comment on the possible impact of such studies on the modeling of multi-parton interactions.

Parton showering effects in central heavy-boson hadroproduction

TL;DR

The paper addresses how noncollinear, high-energy QCD radiation influences heavy-boson production at the LHC by exploring corrections to collinear parton showers and employing unintegrated gluon densities. It compares -shower approaches to traditional collinear showers, demonstrating improved descriptions of jet correlations and enhanced soft activity in central scalar-boson production. The findings indicate that shower modeling and multi-parton interactions jointly shape the underlying event and minijet distributions, with implications for Monte Carlo tuning and Higgs phenomenology. The work advocates a transverse-momentum dependent shower framework as a broader extension to conventional parton showers, applicable to both scalar and vector boson processes.

Abstract

If large-angle multigluon radiation contributes significantly to parton showers associated with heavy boson production at the LHC, appropriate parton branching methods are required for realistic Monte Carlo simulations of final states. We report on a study illustrating such effects in the case of central scalar-boson production. We comment on the possible impact of such studies on the modeling of multi-parton interactions.

Paper Structure

This paper contains 4 sections, 3 figures.

Table of Contents

  1. Introduction
  2. Corrections to collinear showers and jet correlations
  3. Central scalar boson production at the LHC
  4. Outlook

Figures (3)

  • Figure 1: The dijet azimuthal distribution hjradcor normalized to the back-to-back cross section: (solid red) full result (u-pdf $\oplus$ ME); (dashed blue) no finite-k$_\perp$ correction in ME (u-pdf $\oplus$ ME$_{collin.}$); (dotted violet) u-pdf with no resolved branching.
  • Figure 2: Different regions in $\phi$ with respect to the Higgs direction.
  • Figure 3: Multiplicity of jets as a function of the transverse momentum of the Higgs in different regions of $\phi$ as predicted from k$_\perp$-shower ( Cascade) and collinear shower ( Pythia). Shown is also the prediction using Cascade in collinear mode (cascade-dglap). The left figure shows results for mini-jets with $E_T>15$ GeV, the right figure for $E_T>5$ GeV.