Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-11-04
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, 24 figures
Scientific paper
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 are employed to assess the impact on a representative selection of observables. In the MC@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 and Z bosons in association with a jet. Corresponding results are compared to data from the Tevatron and LHC experiments.
Hoeche Stefan
Krauss Frank
Schonherr Marek
Siegert Frank
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