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photo Rikkert Frederix

Rikkert Frederix

Senior lecturer

photo Rikkert Frederix

On improving NLO merging for t t ¯ W production

Author

  • Rikkert Frederix
  • Ioannis Tsinikos

Summary, in English

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.

Department/s

  • Theoretical Particle Physics - Has been reorganised

Publishing year

2021-11

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2021

Issue

11

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • NLO Computations
  • QCD Phenomenology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479