Implementing NLO DGLAP evolution in parton showers

Höche, Stefan; Krauss, Frank; Prestel, Stefan

doi:10.1007/JHEP10(2017)093

Implementing NLO DGLAP evolution in parton showers

Journal Article · 01 October 2017 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP10(2017)093· OSTI ID:1358103

; Krauss, Frank; Prestel, Stefan

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1358103

Report Number(s):: SLAC-PUB-16965; FERMILAB-PUB-17-134-T; IPPP-17-34; DCPT-17-68; -MCNET-17-06; arXiv:1705.00982; 1597584

Journal Information:: Journal of High Energy Physics (Online), Vol. 2017, Issue 10; ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

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