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Implementing NLO DGLAP evolution in parton showers.

Höche, Stefan and Krauss, Frank and Prestel, Stefan (2017) 'Implementing NLO DGLAP evolution in parton showers.', Journal of high energy physics., 2017 (10). p. 93.


We present a parton shower which implements the DGLAP evolution of parton densities and fragmentation functions at next-to-leading order precision up to effects stemming from local four-momentum conservation. The Monte-Carlo simulation is based on including next-to-leading order collinear splitting functions in an existing parton shower and combining their soft enhanced contributions with the corresponding terms at leading order. Soft double counting is avoided by matching to the soft eikonal. Example results from two independent realizations of the algorithm, implemented in the two event generation frameworks Pythia and Sherpa, illustrate the improved precision of the new formalism.

Item Type:Article
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Publisher statement: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:22 September 2017
Date deposited:14 December 2017
Date of first online publication:13 October 2017
Date first made open access:14 December 2017

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