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

Gehrmann, Thomas; Höche, Stefan; Krauss, Frank; Schönherr, Marek; Siegert, Frank

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Thomas Gehrmann

Stefan Höche

Frank Siegert


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.


Gehrmann, T., Höche, S., Krauss, F., Schönherr, M., & Siegert, F. (2013). NLO QCD matrix elements + parton showers in e+e− → hadrons. Journal of High Energy Physics, 2013(1),

Journal Article Type Article
Acceptance Date Dec 13, 2012
Online Publication Date Jan 22, 2013
Publication Date Jan 22, 2013
Deposit Date Mar 2, 2016
Publicly Available Date Apr 8, 2016
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2013
Issue 1


Published Journal Article (989 Kb)

Copyright 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.

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