A Critical Appraisal of NLO+PS Matching Methods

Journal Article · Mon Mar 19 00:00:00 EDT 2012 · Submitted to Journal of High Energy Physics (JHEP)

DOI:https://doi.org/10.1007/JHEP09(2012)049· OSTI ID:1036972

Hoeche, Stefan; Krauss, Frank; Schonherr, Marek; Siegert, Frank

In this publication, uncertainties in and differences between the MC{at}NLO and POWHEG methods for matching next-to-leading order QCD calculations with parton showers are discussed. Implementations of both algorithms within the event generator SHERPA are employed to assess the impact on a representative selection of observables. In the MC{at}NLO approach a phase space restriction has been added to subtraction and parton shower, which allows to vary in a transparent way the amount of non-singular radiative corrections that are exponentiated. Effects on various observables are investigated, using the production of a Higgs boson in gluon fusion, with or without an associated jet, as a benchmark process. The case of H+jet production is presented for the first time in an NLO+PS matched simulation. Uncertainties due to scale choices and non-perturbative effects are explored in the production of W{sup {+-}} and Z bosons in association with a jet. Corresponding results are compared to data from the Tevatron and LHC experiments.

• Research Organization: SLAC National Accelerator Laboratory (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1036972
• Report Number(s): SLAC-PUB-14661; arXiv:1111.1220
• Journal Information: Submitted to Journal of High Energy Physics (JHEP), Journal Name: Submitted to Journal of High Energy Physics (JHEP) Journal Issue: 9 Vol. 2012; ISSN 1029-8479
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ALGORITHMS
BENCHMARKS
BOSONS
FERMILAB TEVATRON
GLUONS
HIGGS BOSONS
PHASE SPACE
Phenomenology-HEP
HEPPH
PRODUCTION
QUANTUM CHROMODYNAMICS
RADIATIVE CORRECTIONS
SIMULATION