Parton Shower and Matching Uncertainties in Top Quark Pair Production with Herwig 7
arXiv:1810.06493 · doi:10.1140/epjc/s10052-019-7370-7
Abstract
We evaluate the theoretical uncertainties in next-to-leading order plus parton shower predictions for top quark pair production and decay in hadronic collisions. Our work is carried out using the Herwig 7 event generator and presents an in-depth study of variations in matching schemes with two systematically different shower algorithms, the traditional angular-ordered and alternative dipole shower. We also present all of the required extensions of the Herwig dipole shower algorithm to properly take into account quark mass effects, as well as its ability to perform top quark decays. The predictions are compared at parton level as well as to LHC data, including in the boosted regime. We find that the regions where predictions with a non-top-quark-specific tune differ drastically from data are plagued by large uncertainties which are consistent between our two shower and matching algorithms.
arXiv comment38 pages, 19 figures
References in corpus (43)
- 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
- FastJet user manual
- 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
- HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
- Matching NLO QCD computations and parton shower simulations
- A General Algorithm for Calculating Jet Cross Sections in NLO QCD
- The total top quark pair production cross-section at hadron colliders through O(alpha_S^4)
- Scattering Amplitudes with Open Loops
- Top++: a program for the calculation of the top-pair cross-section at hadron colliders
- A parton shower algorithm based on Catani-Seymour dipole factorisation
- An update on vector boson pair production at hadron colliders
- Vector boson pair production at the LHC
- The Dipole Formalism for Next-to-Leading Order QCD Calculations with Massive Partons
- Rivet user manual
- A critical appraisal of NLO+PS matching methods
- MINLO: Multi-scale improved NLO
- Jets from Massive Unstable Particles: Top-Mass Determination
- New formalism for QCD parton showers
- One-loop Singular Behaviour of QCD and SUSY QCD Amplitudes with Massive Partons
- Coherent Parton Showers with Local Recoils
- Hard photon production and matrix-element parton-shower merging
- Dipole Showers and Automated NLO Matching in Herwig++
- An NLO+PS generator for and production and decay including non-resonant and interference effects
- Dynamical scales for multi-TeV top-pair production at the LHC
- QCD corrections to top quark pair production in association with a photon at hadron colliders
- Subleading Nc improved Parton Showers
- NLO predictions for Higgs boson pair production with full top quark mass dependence matched to parton showers
- Top quark pair production in association with a jet: QCD corrections and jet radiation in top quark decays
- On the ultimate uncertainty of the top quark pole mass
- Matrix Element Corrections to Parton Shower Simulations of Heavy Quark Decay
- Parton Shower Uncertainties with Herwig 7: Benchmarks at Leading Order
- Merging NLO Multi-jet Calculations with Improved Unitarization
- Simulation of QED Radiation in Particle decays using the YFS Formalism
- Techniques for the treatment of IR divergences in decay processes at NLO and application to the top-quark decay
- Fragmentation Uncertainties in Hadronic Observables for Top-quark Mass Measurements
- NLO and off-shell effects in top quark mass determinations
- ExSample -- A Library for Sampling Sudakov-Type Distributions
- A Simulation of QCD Radiation in Top Quark Decays
- Gluon Radiation in Production and Decay at the LHC
- Monte Carlo Simulation of Hard Radiation in Decays in Beyond the Standard Model Physics in Herwig++
- Colour Rearrangement for Dipole Showers
Cited by in corpus (18)
- Robust Independent Validation of Experiment and Theory: Rivet version 3
- Event Generators for High-Energy Physics Experiments
- What is the Top Quark Mass?
- Next-to-next-to-leading order event generation for top-quark pair production
- Automated Predictions from Polarized Matrix Elements
- Color matrix element corrections for parton showers
- A New Paradigm for Precision Top Physics: Weighing the Top with Energy Correlators
- Top-pair production at the LHC with MiNNLO
- Parton-shower effects in Higgs production via Vector-Boson Fusion
- Soft QCD Effects in VBS/VBF Topologies
- Scale and Scheme Variations in Unitarized NLO Merging
- KrkNLO matching for colour-singlet processes
- A comparative study of Higgs boson production from vector-boson fusion
- Heavy Flavour Jet Substructure
- Dark Sector Showers and Hadronisation in Herwig 7
- Heavy Flavor Jet Substructure at Lepton Colliders
- Jet substructure of light and heavy flavor jets at RHIC
- Next-to-next-to-leading order event generation for production with approximate two-loop amplitude