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arXiv · 2605.00502

Multiplicative matching of neutral current deep-inelastic scattering processes at next-to-leading order in PYTHIA 8

Ilkka Helenius·Joni O. Laulainen·Christian T. Preuss
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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.

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Ilkka Helenius, Joni O. Laulainen, Christian T. Preuss. 2026-05-01. Multiplicative matching of neutral current deep-inelastic scattering processes at next-to-leading order in PYTHIA 8. https://arxiv.org/abs/2605.00502

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