A critical appraisal of NLO PS matching methodsReport as inadecuate

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Journal of High Energy Physics

, 2012:49

First Online: 14 September 2012Received: 08 November 2011Revised: 03 July 2012Accepted: 17 August 2012 Abstract

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.

KeywordsQCD Phenomenology ArXiv ePrint: 1111.1220

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Author: Stefan Höche - Frank Krauss - Marek Schönherr - Frank Siegert

Source: https://link.springer.com/


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