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 at first order in the strong coupling. This multiplicative matching 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 with 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.
Cite
@article{arxiv.2605.00502,
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},
journal= {arXiv preprint arXiv:2605.00502},
year = {2026}
}
Comments
18 pages, 11 figures