Merging NLO Multi-jet Calculations with Improved Unitarization

Research output: Contribution to journalArticle


We present an algorithm to combine multiple matrix elements at LO and NLO with a parton shower. We build on the unitarized merging paradigm. The inclusion of higher orders and multiplicities reduce the scale uncertainties for observables sensitive to hard emissions, while preserving the features of inclusive quantities. The combination allows further soft and collinear emissions to be predicted by the all-order parton-shower approximation. We inspect the impact of terms that are formally but not parametrically negligible. We present results for a number of collider observables where multiple jets are observed, either on their own or in the presence of additional uncoloured particles. The algorithm is implemented in the event generator Herwig.


External organisations
  • Durham University
  • Karlsruhe Institute of Technology
  • University of Manchester
  • University of Vienna
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number244
JournalEuropean Physical Journal C
Issue number3
Publication statusPublished - 2018 Mar
Publication categoryResearch
Externally publishedYes