Implementing NLO DGLAP evolution in parton showers

Höche, Stefan; Krauss, Frank; Prestel, Stefan

Abstract

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.

Citation

Höche, S., Krauss, F., & Prestel, S. (2017). Implementing NLO DGLAP evolution in parton showers. Journal of High Energy Physics, 2017(10), Article 93. https://doi.org/10.1007/jhep10%282017%29093

• Journal Article Type: Article
• Acceptance Date: Sep 22, 2017
• Online Publication Date: Oct 13, 2017
• Publication Date: Oct 13, 2017
• Deposit Date: Dec 14, 2017
• Publicly Available Date: Dec 14, 2017
• Journal: Journal of High Energy Physics
• Print ISSN: 1126-6708
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Volume: 2017
• Issue: 10
• Article Number: 93
• DOI: https://doi.org/10.1007/jhep10%282017%29093