Parton showers beyond leading logarithmic accuracy

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Frederic A. Dreyer
  • Keith Hamilton
  • Pier Francesco Monni
  • Gavin P. Salam
  • Grégory Soyez


Parton showers are among the most widely used tools in collider physics. Despite their key importance, none so far has been able to demonstrate accuracy beyond a basic level known as leading logarithmic (LL) order, with ensuing limitations across a broad spectrum of physics applications. In this letter, we propose criteria for showers to be considered next-to-leading logarithmic (NLL) accurate. We then introduce new classes of shower, for final-state radiation, that satisfy the main elements of these criteria in the widely used large-NC limit. As a proof of concept, we demonstrate these showers’ agreement with all-order analytical NLL calculations for a range of observables, something never so far achieved for any parton shower.

Bibliographical metadata

Original languageEnglish
Article number052002
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 28 Jul 2020

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