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Title: Implementing NLO DGLAP evolution in parton showers

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.

Authors:
ORCiD logo; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1358103
Report Number(s):
SLAC-PUB-16965; FERMILAB-PUB-17-134-T; IPPP-17-34; DCPT-17-68; -MCNET-17-06; arXiv:1705.00982
Journal ID: ISSN 1029-8479; 1597584
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Höche, Stefan, Krauss, Frank, and Prestel, Stefan. Implementing NLO DGLAP evolution in parton showers. United States: N. p., 2017. Web. doi:10.1007/JHEP10(2017)093.
Höche, Stefan, Krauss, Frank, & Prestel, Stefan. Implementing NLO DGLAP evolution in parton showers. United States. doi:10.1007/JHEP10(2017)093.
Höche, Stefan, Krauss, Frank, and Prestel, Stefan. Sun . "Implementing NLO DGLAP evolution in parton showers". United States. doi:10.1007/JHEP10(2017)093. https://www.osti.gov/servlets/purl/1358103.
@article{osti_1358103,
title = {Implementing NLO DGLAP evolution in parton showers},
author = {Höche, Stefan and Krauss, Frank and Prestel, Stefan},
abstractNote = {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.},
doi = {10.1007/JHEP10(2017)093},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2017,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}