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NLO QCD matrix elements + parton showers in e+e− → hadrons.

Gehrmann, Thomas and Höche, Stefan and Krauss, Frank and Schönherr, Marek and Siegert, Frank (2013) 'NLO QCD matrix elements + parton showers in e+e− → hadrons.', Journal of high energy physics., 2013 (1). p. 144.

Abstract

We present a new approach to combine multiple NLO parton-level calculations matched to parton showers into a single inclusive event sample. The method provides a description of hard multi-jet configurations at next-to leading order in the perturbative expansion of QCD, and it is supplemented with the all-orders resummed modelling of jet fragmentation provided by the parton shower. The formal accuracy of this technique is discussed in detail, invoking the example of electron-positron annihilation into hadrons. We focus on the effect of renormalisation scale variations in particular. Comparison with experimental data from LEP underlines that this novel formalism describes data with a theoretical accuracy that has hitherto not been achieved in standard Monte Carlo event generators.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1007/JHEP01(2013)144
Publisher statement:Open Access, © The Authors. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Date accepted:13 December 2012
Date deposited:08 April 2016
Date of first online publication:22 January 2013
Date first made open access:No date available

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