Color matrix element corrections for parton showers

Research output: Contribution to journalArticle


We investigate the effects of keeping the full color structure for parton emissions in parton showers for both LEP and LHC. This is done within the Herwig 7 dipole shower, and includes gluon emission, gluon splitting, initial state branching processes, as well as hadronization. The subleading Nc terms are included as color matrix element corrections to the splitting kernels by evolving an amplitude-level density operator and correcting the radiation pattern for each parton multiplicity, up to a fixed number of full color emissions, after which a standard leading color shower takes over. Our results are compared to data for a wide range of LEP and LHC observables and show that the subleading Nc corrections tend to be small for most observables probing hard, perturbative dynamics, for both LEP and LHC. However, for some of these observables they exceed 10%. On soft physics we find signs of significantly larger effects.


External organisations
  • University of Vienna
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics


  • QCD Phenomenology
Original languageEnglish
Article number9
JournalJournal of High Energy Physics
Issue number11
Publication statusPublished - 2018 Nov 5
Publication categoryResearch

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