Logarithmic accuracy of parton showers: a fixed-order study

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  • Authors:
  • Mrinal Dasgupta
  • Frédéric A. Dreyer
  • Keith Hamilton
  • Pier Francesco Monni
  • Gavin P. Salam


We formulate some first fundamental elements of an approach for assessing the logarithmic accuracy of parton-shower algorithms based on two broad criteria: their ability to reproduce the singularity structure of multi-parton matrix elements, and their ability to reproduce logarithmic resummation results. We illustrate our approach by considering properties of two transverse-momentum ordered final-state showers, examining features up to second order in the strong coupling. In particular we identify regions where they fail to reproduce the known singular limits of matrix elements. The characteristics of the shower that are responsible for this also affect the logarithmic resummation accuracies of the shower, both in terms of leading (double) logarithms at subleading NC and next-to-leading (single) logarithms at leading NC.

Bibliographical metadata

Original languageEnglish
Article number33
JournalJournal of High Energy Physics
Issue number9
Early online date7 Sep 2018
Publication statusPublished - 7 Sep 2018

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