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QCD matrix elements and truncated showers


Höche, S; Krauss, F; Schumann, S; Siegert, F (2009). QCD matrix elements and truncated showers. Journal of High Energy Physics, (05):053.

Abstract

We derive an improved prescription for the merging of matrix elements with parton showers, extending the CKKW approach. A flavour-dependent phase space separation criterion is proposed. We show that this new method preserves the logarithmic accuracy of the shower, and that the original proposal can be derived from it. One of the main requirements for the method is a truncated shower algorithm. We outline the corresponding Monte Carlo procedures and apply the new prescription to QCD jet production in e+e− collisions and Drell-Yan lepton pair production. Explicit colour information from matrix elements obtained through colour sampling is incorporated in the merging and the influence of different prescriptions to assign colours in the large NC limit is studied. We assess the systematic uncertainties of the new method.

Abstract

We derive an improved prescription for the merging of matrix elements with parton showers, extending the CKKW approach. A flavour-dependent phase space separation criterion is proposed. We show that this new method preserves the logarithmic accuracy of the shower, and that the original proposal can be derived from it. One of the main requirements for the method is a truncated shower algorithm. We outline the corresponding Monte Carlo procedures and apply the new prescription to QCD jet production in e+e− collisions and Drell-Yan lepton pair production. Explicit colour information from matrix elements obtained through colour sampling is incorporated in the merging and the influence of different prescriptions to assign colours in the large NC limit is studied. We assess the systematic uncertainties of the new method.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Nuclear and High Energy Physics
Language:English
Date:2009
Deposited On:27 Feb 2010 15:10
Last Modified:29 Jul 2020 21:57
Publisher:Institute of Physics Publishing
ISSN:1029-8479
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1088/1126-6708/2009/05/053
Related URLs:http://arxiv.org/abs/0903.1219

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