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Precise Predictions for the Associated Production of a W Boson with a Top-Antitop Quark Pair at the LHC


Buonocore, Luca; Devoto, Simone; Grazzini, Massimiliano; Kallweit, Stefan; Mazzitelli, Javier; Rottoli, Luca; Savoini, Chiara (2023). Precise Predictions for the Associated Production of a W Boson with a Top-Antitop Quark Pair at the LHC. Physical Review Letters, 131(23):231901.

Abstract

The production of a top-antitop quark pair in association with a W boson (t¯tW) is one of the heaviest signatures currently probed at the Large Hadron Collider. Since the first observation reported in 2015, the corresponding rates have been found to be consistently higher than the standard model predictions, which are based on next-to-leading order calculations in the QCD and electroweak interactions. We present the first next-to-next-to-leading order QCD computation of t¯tW production at hadron colliders. The calculation is exact, except for the finite part of the two-loop virtual corrections, which is estimated using two different approaches that lead to consistent results within their uncertainties. We combine the newly computed next-to-next-to-leading order QCD corrections with the complete next-to-leading order QCD plus electroweak results, thus obtaining the most advanced perturbative prediction available to date for the t¯tW inclusive cross section. The tension with the latest ATLAS and CMS results remains at the 1σ−2σ level.

Abstract

The production of a top-antitop quark pair in association with a W boson (t¯tW) is one of the heaviest signatures currently probed at the Large Hadron Collider. Since the first observation reported in 2015, the corresponding rates have been found to be consistently higher than the standard model predictions, which are based on next-to-leading order calculations in the QCD and electroweak interactions. We present the first next-to-next-to-leading order QCD computation of t¯tW production at hadron colliders. The calculation is exact, except for the finite part of the two-loop virtual corrections, which is estimated using two different approaches that lead to consistent results within their uncertainties. We combine the newly computed next-to-next-to-leading order QCD corrections with the complete next-to-leading order QCD plus electroweak results, thus obtaining the most advanced perturbative prediction available to date for the t¯tW inclusive cross section. The tension with the latest ATLAS and CMS results remains at the 1σ−2σ level.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Physics and Astronomy
Uncontrolled Keywords:General Physics and Astronomy
Language:English
Date:5 December 2023
Deposited On:22 Dec 2023 12:58
Last Modified:28 Jun 2024 03:31
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/physrevlett.131.231901
Project Information:
  • : FunderH2020
  • : Grant ID714788
  • : Project TitleREINVENT - REsummation-Improved moNtecarlo eVEnt geNeraTor
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)