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

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

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.

Citation

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), https://doi.org/10.1007/jhep01%282013%29144

• 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
• Electronic ISSN: 1029-8479
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Volume: 2013
• Issue: 1
• DOI: https://doi.org/10.1007/jhep01%282013%29144
• Public URL: https://durham-repository.worktribe.com/output/1418129