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Subleading EW corrections and spin-correlation effects in tt¯ W multi-lepton signatures

Frederix, Rikkert LU orcid and Tsinikos, Ioannis LU (2020) In European Physical Journal C 80(9).
Abstract

Recently a slight tension between data and predictions has been reported in tt¯ W production by both the CMS and ATLAS collaborations. We revisit the theoretical predictions for this process, focussing on the following two effects. We disentangle various effects that lead to asymmetries among the leptonic decay products of the (anti-)top quarks and W bosons, for which we find that the spin correlations in the top-quark pair are the dominant source. We also discuss the impact of the large, formally subleading, electroweak corrections to tt¯ W production at the LHC. We find that this effect changes the tt¯ W cross section significantly in the signature phase-space regions, and should therefore be included differentially in the theory to... (More)

Recently a slight tension between data and predictions has been reported in tt¯ W production by both the CMS and ATLAS collaborations. We revisit the theoretical predictions for this process, focussing on the following two effects. We disentangle various effects that lead to asymmetries among the leptonic decay products of the (anti-)top quarks and W bosons, for which we find that the spin correlations in the top-quark pair are the dominant source. We also discuss the impact of the large, formally subleading, electroweak corrections to tt¯ W production at the LHC. We find that this effect changes the tt¯ W cross section significantly in the signature phase-space regions, and should therefore be included differentially in the theory to data comparisons.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
80
issue
9
article number
803
publisher
Springer
external identifiers
  • scopus:85090015030
ISSN
1434-6044
DOI
10.1140/epjc/s10052-020-8388-6
language
English
LU publication?
yes
id
655cd93f-dbb8-4c5e-9822-e2dd051e7f0d
date added to LUP
2020-09-25 10:18:04
date last changed
2024-04-17 16:12:24
@article{655cd93f-dbb8-4c5e-9822-e2dd051e7f0d,
  abstract     = {{<p>Recently a slight tension between data and predictions has been reported in tt¯ W production by both the CMS and ATLAS collaborations. We revisit the theoretical predictions for this process, focussing on the following two effects. We disentangle various effects that lead to asymmetries among the leptonic decay products of the (anti-)top quarks and W bosons, for which we find that the spin correlations in the top-quark pair are the dominant source. We also discuss the impact of the large, formally subleading, electroweak corrections to tt¯ W production at the LHC. We find that this effect changes the tt¯ W cross section significantly in the signature phase-space regions, and should therefore be included differentially in the theory to data comparisons.</p>}},
  author       = {{Frederix, Rikkert and Tsinikos, Ioannis}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{9}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Subleading EW corrections and spin-correlation effects in tt¯ W multi-lepton signatures}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-020-8388-6}},
  doi          = {{10.1140/epjc/s10052-020-8388-6}},
  volume       = {{80}},
  year         = {{2020}},
}