On improving NLO merging for t t ¯ W production

Rikkert Frederix, Ioannis Tsinikos

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3 Citations (SciVal)


We introduce an improvement to the FxFx matrix element merging procedure for pp →tt¯ W production at NLO in QCD with one and/or two additional jets. The main modification is an improved treatment of jets that are not logarithmically enhanced in the low transverse-momentum regime. We provide predictions for the inclusive cross section and the tt¯ W differential distributions including parton-shower effects. Taking also the NLO EW corrections into account, this results in the most-accurate predictions for this process to date. We further proceed to include the on-shell LO decays of the tt¯ W including the tree-level spin correlations within the narrow-width approximation, focusing on the multi-lepton signatures studied at the LHC. We find a ∼30% increase over the NLO QCD prediction and large non-flat K-factors to differential distributions.

Original languageEnglish
Article number29
JournalJournal of High Energy Physics
Issue number11
Publication statusPublished - 2021 Nov

Subject classification (UKÄ)

  • Subatomic Physics


  • NLO Computations
  • QCD Phenomenology


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