Multiplicative matching of neutral current deep-inelastic scattering processes at next-to-leading order in PYTHIA 8
Abstract
We introduce a method for matching the neutral-current deep inelastic scattering process with parton showers in Pythia 8, at first order in the strong coupling. The implementation, based on the well-established multiplicative matching approach, is achieved by reweighting leading-order Born-level events and requires that the first parton-shower emission is distributed according to the real matrix-element. The method is implemented as an internal matching strategy in the Pythia 8 event generator applicable to both currently available parton-shower algorithms, the default one and Vincia. The validity of higher-order corrections is verified with comparisons against existing next-to-leading order simulations. The strategy is used to describe reduced cross-sections measured at the HERA collider, and we find better overall agreement and reduced uncertainties with the matching.
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BibTeX
@misc{helenius2026multiplicative,
title = {{Multiplicative matching of neutral current deep-inelastic scattering processes at next-to-leading order in PYTHIA 8}},
author = {Ilkka Helenius and Joni O. Laulainen and Christian T. Preuss},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2605.00502},
eprint = {2605.00502},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.00502},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Multiplicative matching of neutral current deep-inelastic scattering processes at next-to-leading order in PYTHIA 8
AU - Ilkka Helenius
AU - Joni O. Laulainen
AU - Christian T. Preuss
PY - 2026
DA - 2026/09/17
PB - arXiv
DO - 10.48550/arxiv.2605.00502
UR - https://arxiv.org/abs/2605.00502
AB - We introduce a method for matching the neutral-current deep inelastic scattering process with parton showers in Pythia 8, at first order in the strong coupling. The implementation, based on the well-established multiplicative matching approach, is achieved by reweighting leading-order Born-level events and requires that the first parton-shower emission is distributed according to the real matrix-element. The method is implemented as an internal matching strategy in the Pythia 8 event generator applicable to both currently available parton-shower algorithms, the default one and Vincia. The validity of higher-order corrections is verified with comparisons against existing next-to-leading order simulations. The strategy is used to describe reduced cross-sections measured at the HERA collider, and we find better overall agreement and reduced uncertainties with the matching.
ER -