Multiplicative NLO matching in DIS with Pythia 8
Abstract
We present a new multiplicative next-to-leading order (NLO) matching scheme in Pythia 8 for deep-inelastic scattering (DIS) processes in electron-proton collisions. The implementation is based on numerical event-by-event integration over the virtual corrections and real-emission phase-space and matrix-element corrections (MECs) for the first parton-shower emission. The latter has been included for two parton-shower options currently available in Pythia 8 to handle DIS processes, the default shower with dipole-recoil option and Vincia. The implementation has been validated against other available NLO-capable event generators and compared to experimental data from the HERA collider. In all cases we find very good agreement confirming the validity of the new Pythia implementation. We also study the impact of the MECs in each shower and consider the implications for the upcoming Electron-Ion collider.
Related
- Multiplicative matching of neutral current deep-inelastic scattering processes at next-to-leading order in PYTHIA 8
- Pythia-Contrib: a modular contribution framework for the Pythia 8 event generator
- Color-Reconnection Effects on the nMPI-Nch Conditional Multiplicity Fluctuations in PYTHIA 8 pp Collisions
- Joint Bayesian Inference for Extraction of Charmonium Long Distance Matrix Elements Using PYTHIA
- Photon Fragmentation Functions in LHAPDF: Existing Sets and a Pythia-Based Extraction
BibTeX
@misc{helenius2026multiplicative,
title = {{Multiplicative NLO matching in DIS with Pythia 8}},
author = {Ilkka Helenius and Joni O. Laulainen and Christian T. Preuss},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.17015},
eprint = {2609.17015},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.17015},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Multiplicative NLO matching in DIS with Pythia 8
AU - Ilkka Helenius
AU - Joni O. Laulainen
AU - Christian T. Preuss
PY - 2026
DA - 2026/09/15
PB - arXiv
DO - 10.48550/arxiv.2609.17015
UR - https://arxiv.org/abs/2609.17015
AB - We present a new multiplicative next-to-leading order (NLO) matching scheme in Pythia 8 for deep-inelastic scattering (DIS) processes in electron-proton collisions. The implementation is based on numerical event-by-event integration over the virtual corrections and real-emission phase-space and matrix-element corrections (MECs) for the first parton-shower emission. The latter has been included for two parton-shower options currently available in Pythia 8 to handle DIS processes, the default shower with dipole-recoil option and Vincia. The implementation has been validated against other available NLO-capable event generators and compared to experimental data from the HERA collider. In all cases we find very good agreement confirming the validity of the new Pythia implementation. We also study the impact of the MECs in each shower and consider the implications for the upcoming Electron-Ion collider.
ER -