KrkNLO matching for colour-singlet processes
arXiv:2409.16417 · doi:10.1007/JHEP01(2025)062
Abstract
Matched calculations combining perturbative QCD with parton showers are an indispensable tool for LHC physics. Two methods for NLO matching are in widespread use: MC@NLO and POWHEG. We describe an alternative, KrkNLO, reformulated to be easily applicable to any colour-singlet process. The primary distinguishing characteristic of KrkNLO is its use of an alternative factorisation scheme, the 'Krk' scheme, to achieve NLO accuracy. We describe the general implementation of KrkNLO in Herwig 7, using diphoton production as a test process. We systematically compare its predictions to those produced by MC@NLO with several different choices of shower scale, both truncated to one-emission and with the shower running to completion, and to ATLAS data from LHC Run 2.
40 pages, 11 figures. Additional discussion of the NLO matching condition. Version accepted for publication by JHEP
References in corpus (71)
- PYTHIA 6.4 Physics and Manual
- The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
- The anti-k_t jet clustering algorithm
- A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
- A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
- Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
- LHAPDF6: parton density access in the LHC precision era
- Herwig 7.0 / Herwig++ 3.0 Release Note
- A parton shower algorithm based on Catani-Seymour dipole factorisation
- QCD matrix elements + parton showers: The NLO case
- New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC
- NLO single-top production matched with shower in POWHEG: s- and t-channel contributions
- A critical appraisal of NLO+PS matching methods
- OpenLoops 2
- NLO vector-boson production matched with shower in POWHEG
- NLO Higgs boson production via vector-boson fusion matched with shower in POWHEG
- NLO Higgs boson production via gluon fusion matched with shower in POWHEG
- Automated One-Loop Calculations with GoSam
- Robust Independent Validation of Experiment and Theory: Rivet version 3
- NNLOPS simulation of Higgs boson production
- Handbook of LHC Higgs Cross Sections: 2. Differential Distributions
- GoSam-2.0: a tool for automated one-loop calculations within the Standard Model and beyond
- Single-top t-channel hadroproduction in the four-flavour scheme with POWHEG and aMC@NLO
- Diphoton production at hadron colliders: a fully-differential QCD calculation at NNLO
- Merging Multi-leg NLO Matrix Elements with Parton Showers
- Coherent Parton Showers with Local Recoils
- Dipole Showers and Automated NLO Matching in Herwig++
- Predictions for diphoton production at the LHC through NNLO in QCD
- Combining Higher-Order Resummation with Multiple NLO Calculations and Parton Showers in GENEVA
- Higgs-boson production through gluon fusion at NNLO QCD with parton showers
- Drell-Yan Production at NNLL'+NNLO Matched to Parton Showers
- Automated Parton-Shower Variations in Pythia 8
- Reweighting QCD matrix-element and parton-shower calculations
- Matching Fully Differential NNLO Calculations and Parton Showers
- Matching Parton Showers to NLO Computation
- NLO predictions for Higgs boson pair production with full top quark mass dependence matched to parton showers
- Controlling inclusive cross sections in parton shower + matrix element merging
- Squark and Gluino Production with Jets
- MiNNLO: A new method to match NNLO QCD to parton showers
- Parton showers from the dipole formalism
- A Positive-Weight Next-to-Leading-Order Monte Carlo for Z Pair Hadroproduction
- Uncertainties in NLO + parton shower matched simulations of inclusive jet and dijet production
- Parton Shower and NLO-Matching uncertainties in Higgs Boson Pair Production
- Reweighting Parton Showers
- Next-to-Leading-Order Event Generators
- Matching NLO QCD with parton shower in Monte Carlo scheme - the KrkNLO method
- Fooling Around with the Sudakov Veto Algorithm
- A Positive-Weight Next-to-Leading Order Monte Carlo Simulation of Drell-Yan Vector Boson Production
- Parton Shower Uncertainties with Herwig 7: Benchmarks at Leading Order
- On the reduction of negative weights in MC@NLO-type matching procedures
- Merging NLO Multi-jet Calculations with Improved Unitarization
- Improved Parton Showers at Large Transverse Momenta
- Top-quark pair production in association with a gauge boson in the POWHEG-BOX
- A positive-weight next-to-leading order simulation of weak boson pair production
- Uncertainties of Sudakov form factors
- Parton Shower and Matching Uncertainties in Top Quark Pair Production with Herwig 7
- Resummation ambiguities in the Higgs transverse-momentum spectrum in the Standard Model and beyond
- A new parton shower algorithm: Shower evolution, matching at leading and next-to-leading order level
- Inclusion of the QCD next-to-leading order corrections in the quark-gluon Monte Carlo shower
- Scale and isolation sensitivity of diphoton distributions at the LHC
- Parton-shower effects in Higgs production via Vector-Boson Fusion
- The Higgs transverse momentum distribution in gluon fusion as a multiscale problem
- Competing Sudakov Veto Algorithms
- A POWHEG generator for deep inelastic scattering
- Transverse momentum resummation for Higgs production via gluon fusion in the MSSM
- NLO corrections to hard process in QCD shower -- proof of concept
- Multiplicative-Accumulative matching of NLO calculations with parton showers
- NNLO+PS Monte Carlo simulation of photon pair production with MiNNLOPS
- Monte Carlo simulations of Higgs-boson production at the LHC with the KrkNLO method
- Parton distribution functions in Monte Carlo factorisation scheme
- On the universality of the KRK factorization scheme