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On improving NLO merging for t t ¯ W production

Frederix, Rikkert LU orcid and Tsinikos, Ioannis LU (2021) In Journal of High Energy Physics 2021(11).
Abstract

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... (More)

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.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
NLO Computations, QCD Phenomenology
in
Journal of High Energy Physics
volume
2021
issue
11
article number
29
publisher
Springer
external identifiers
  • scopus:85118710164
ISSN
1029-8479
DOI
10.1007/JHEP11(2021)029
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021, The Author(s).
id
1dc87a97-ffc3-4358-ae85-30d0e7423593
date added to LUP
2021-11-30 21:28:21
date last changed
2024-04-20 17:47:10
@article{1dc87a97-ffc3-4358-ae85-30d0e7423593,
  abstract     = {{<p>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.</p>}},
  author       = {{Frederix, Rikkert and Tsinikos, Ioannis}},
  issn         = {{1029-8479}},
  keywords     = {{NLO Computations; QCD Phenomenology}},
  language     = {{eng}},
  number       = {{11}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{On improving NLO merging for t t ¯ W production}},
  url          = {{http://dx.doi.org/10.1007/JHEP11(2021)029}},
  doi          = {{10.1007/JHEP11(2021)029}},
  volume       = {{2021}},
  year         = {{2021}},
}