Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig
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| Format: | Preprint |
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2026
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| _version_ | 1866913086941691904 |
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| author | Holguin, Jack Plätzer, Simon Seymour, Michael H. Sule, Siddharth |
| author_facet | Holguin, Jack Plätzer, Simon Seymour, Michael H. Sule, Siddharth |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_02622 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig Holguin, Jack Plätzer, Simon Seymour, Michael H. Sule, Siddharth High Energy Physics - Phenomenology 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. |
| title | Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.02622 |