期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 9, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP09(2012)049
关键词
QCD Phenomenology
资金
- US Department of Energy [DE-AC02-76SF00515]
- US National Science Foundation [NSF-PHY-0705682, NSF-PHY-0551164]
- Research Executive Agency (REA) of the European Union [PITN-GA-2010-264564]
- German Research Foundation (DFG) [DI 784/2-1]
- Division Of Physics
- Direct For Mathematical & Physical Scien [705682] Funding Source: National Science Foundation
In this publication, uncertainties in and differences between the MC@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 and based on Catani-Seymour subtraction are employed to assess the impact on a representative selection of observables. In the case of MC@NLO a substantial simplification is achieved by using dipole subtraction terms to generate the first emission. A phase space restriction is employed, 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-+/- and Z bosons in association with a jet. Corresponding results are compared to data from the Tevatron and LHC experiments.
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