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<p>We present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in <i>pp</i> collisions, as well as DIS and <i>e</i><sup>+</sup><i>e</i><sup><i>−</i></sup> to jets. The methods include adaptations of existing approaches, as well as a new NLO matching scheme, ESME, that is positive-definite by construction. Our implementations of the methods within the PanScales framework yield highly competitive NLO event generation speeds. We validate the fixed-order and combined resummation accuracy with tests in the limit of small QCD coupling and briefly touch on phenomenological comparisons to standard NLO results and to Drell-Yan data. The progress reported here is an essential step towards showers with logarithmic accuracy beyond NLL for processes with incoming hadrons.</p>

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Logarithmically-accurate and positive-definite NLO shower matching

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月3日

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  • Melissa van Beekveld,
  • Silvia Ferrario Ravasio,
  • Jack Helliwell,
  • Alexander Karlberg,
  • Gavin P. Salam,
  • Ludovic Scyboz,
  • Alba Soto-Ontoso,
  • Gregory Soyez,
  • Silvia Zanoli

摘要

We present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in pp collisions, as well as DIS and e+e− to jets. The methods include adaptations of existing approaches, as well as a new NLO matching scheme, ESME, that is positive-definite by construction. Our implementations of the methods within the PanScales framework yield highly competitive NLO event generation speeds. We validate the fixed-order and combined resummation accuracy with tests in the limit of small QCD coupling and briefly touch on phenomenological comparisons to standard NLO results and to Drell-Yan data. The progress reported here is an essential step towards showers with logarithmic accuracy beyond NLL for processes with incoming hadrons.