QCD Matrix Elements + Parton Showers

2001/09/25 by Stefano Catani, S. Catani, Frank Krauss +5 · 25 citations
Physics and Astronomy · #Annihilation #Electron–positron annihilation #Event generator #Hadron #High-Energy Particle Collisions Research #Jet (fluid) #Matrix (chemical analysis) #Monte Carlo method #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Parton #Parton shower #Perturbative QCD #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #hep-ph

paper · pdf · doi:10.1088/1126-6708/2001/11/063

published as JHEP 0111:063,2001 · 21 pages, 11 figures, uses JHEP.cls

arxiv created 2001/09/25 · openalex publication_date 2001/11/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

We propose a method for combining QCD matrix elements and parton showers in Monte Carlo simulations of hadronic final states in e⁺e^- annihilation. The matrix element and parton shower domains are separated at some value y_ini of the jet resolution, defined according to the k_T-clustering algorithm. The matrix elements are modified by Sudakov form factors and the parton showers are subjected to a veto procedure to cancel dependence on y_ini to next-to-leading logarithmic accuracy. The method provides a leading-order description of hard multi-jet configurations together with jet fragmentation, while avoiding the most serious problems of double counting. We present first results of an approximate implementation using the event generator APACIC++.

Citations

• Higher order corrections to parton showering from resummation calculations
• Some thoughts on how to match Leading Log Parton Showers with NLO Matrix Elements
• HERWIG 6: an event generator for hadron emission reactions with interfering gluons (including supersymmetric processes)

Cited by

• Search for W W/W Z resonance production in ℓνqq final states in pp collisions at √(s)=13 TeV with the ATLAS detector
• Measurement of the W+b-jet and W+c-jet differential production cross sections in pp¯ collisions at s=1.96 TeV
• Measurements of the production cross-section for a Z boson in association with b-jets in proton-proton collisions at √(s) = 13 TeV with the ATLAS detector
• A strategy for a general search for new phenomena using data-derived signal regions and its application within the ATLAS experiment
• Higgs-Strahlung: Merging the NLO Drell-Yan and loop-induced0+1jet multiplicities
• Evidence for single top-quark production in the s-channel in proton–proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method
• Properties of g→bb¯ at small opening angles in pp collisions with the ATLAS detector at s=13 TeV
• Simulation of vector boson plus many jet final states at the high luminosity LHC
• Measurement of the tt¯ production cross-section in the lepton+jets channel at s=13 TeV with the ATLAS experiment
• Measurement of W^± Z production cross sections and gauge boson polarisation in pp collisions at √(s) = 13~\text TeV with the ATLAS detector
• Multijet merging in a variable flavor number scheme
• Search for dark matter produced in association with a single top quark in √(s)=13 TeV pp collisions with the ATLAS detector
• Measurement of the four-lepton invariant mass spectrum in 13 TeV proton-proton collisions with the ATLAS detector
• Monojet signatures from heavy colored particles: future collider sensitivities and theoretical uncertainties
• Search for charged Higgs bosons decaying into a top quark and a bottom quark at √(s) = 13 TeV with the ATLAS detector
• Review of single vector boson production in pp collisions at √(s) = 7 s = 7 TeV
• A model of non-perturbative gluon emission in an initial state parton shower
• A perturbative framework for jet quenching
• Jet substructure templates: data-driven QCD backgrounds for fat jet searches
• Merging meets matching in MC@NLO
• Multi-jet merged top-pair production including electroweak corrections
• GenEvA (I): a new framework for event generation
• Boosting invisible searches viaZH: From the Higgs boson to dark matter simplified models
• Sensitivity to longitudinal vector boson scattering in semileptonic final states at the HL-LHC
• In situ calibration of large-radius jet energy and mass in 13 TeV proton–proton collisions with the ATLAS detector