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PreprintCC BY-NC-ND 4.0arXiv

Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig

  • Jack Holguin
  • Simon Plätzer
  • Michael H. Seymour
  • Siddharth Sule
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Abstract

We have implemented two recently proposed dipole shower algorithms that have next-to-leading-logarithmic accuracy at leading colour in the Herwig event generator. We study their properties and compare them to Herwig's existing dipole and angular ordered parton shower algorithms. In addition to their improved properties in the logarithmic regime, we find important roles for their extrapolations into the hard regime, where we perform NLO matching, and into the infrared regime, where we perform cluster hadronization. We emphasise the importance of this infrared regime and the precise definition of the infrared cutoff used by each shower as the initial state for Herwig's hadronization model. Studying the results at the hadron level, we find important consequences of this infrared cutoff difference and propose it as a starting point for further study of the interplay between parton showers and hadronization models. We conclude by studying the models' tunability and identifying the best-fit parameters for each.

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Cite

BibTeXRIS
BibTeX
@misc{holguin2026studying,
  title = {{Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig}},
  author = {Jack Holguin and Simon Plätzer and Michael H. Seymour and Siddharth Sule},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2605.02622},
  eprint = {2605.02622},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.02622},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig
AU  - Jack Holguin
AU  - Simon Plätzer
AU  - Michael H. Seymour
AU  - Siddharth Sule
PY  - 2026
DA  - 2026/09/09
PB  - arXiv
DO  - 10.48550/arxiv.2605.02622
UR  - https://arxiv.org/abs/2605.02622
AB  - We have implemented two recently proposed dipole shower algorithms that have next-to-leading-logarithmic accuracy at leading colour in the Herwig event generator. We study their properties and compare them to Herwig's existing dipole and angular ordered parton shower algorithms. In addition to their improved properties in the logarithmic regime, we find important roles for their extrapolations into the hard regime, where we perform NLO matching, and into the infrared regime, where we perform cluster hadronization. We emphasise the importance of this infrared regime and the precise definition of the infrared cutoff used by each shower as the initial state for Herwig's hadronization model. Studying the results at the hadron level, we find important consequences of this infrared cutoff difference and propose it as a starting point for further study of the interplay between parton showers and hadronization models. We conclude by studying the models' tunability and identifying the best-fit parameters for each.
ER  -