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Scientific article
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English

Search for leptonic charge asymmetry in $ t\overline{t}W $ production in final states with three leptons at $ \sqrt{s} $ = 13 TeV

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 7, 33
Publication date2023
First online date2023-07-05
Abstract

A search for the leptonic charge asymmetry ($ {A}_{\textrm{c}}^{\ell } $) of top-quark-antiquark pair production in association with a W boson ($ t\overline{t}W $) is presented. The search is performed using final states with exactly three charged light leptons (electrons or muons) and is based on $ \sqrt{s} $ = 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider at CERN during the years 2015–2018, corresponding to an integrated luminosity of 139 fb$^{−1}$. A profile-likelihood fit to the event yields in multiple regions corresponding to positive and negative differences between the pseudorapidities of the charged leptons from top-quark and top-antiquark decays is used to extract the charge asymmetry. At reconstruction level, the asymmetry is found to be −0.12 ± 0.14 (stat.) ± 0.05 (syst.). An unfolding procedure is applied to convert the result at reconstruction level into a charge-asymmetry value in a fiducial volume at particle level with the result of −0.11 ± 0.17 (stat.) ± 0.05 (syst.). The Standard Model expectations for these two observables are calculated using Monte Carlo simulations with next-to-leading-order plus parton shower precision in quantum chromodynamics and including next-to-leading-order electroweak corrections. They are $ -{0.084}_{-0.003}^{+0.005} $ (scale) ± 0.006 (MC stat.) and $ -{0.063}_{-0.004}^{+0.007} $ (scale) ± 0.004 (MC stat.) respectively, and in agreement with the measurements.

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Keywords
  • Hadron-Hadron Scattering
  • Top Physics
  • P p: scattering
  • P p: colliding beams
  • Charge: asymmetry
  • Top: pair production
  • W: associated production
  • Perturbation theory: higher-order
  • Higher-order: 1
  • Numerical calculations: Monte Carlo
  • Parton: showers
  • Electroweak interaction: correction
  • Antiquark: pair production
  • Final state: ((n)jet 3lepton)
  • Muon
  • Quantum chromodynamics: perturbation theory
  • CERN Lab
  • Electron
  • CERN LHC Coll
  • Rapidity
  • ATLAS
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for leptonic charge asymmetry in $ t\overline{t}W $ production in final states with three leptons at $ \sqrt{s} $ = 13 TeV. In: The journal of high energy physics, 2023, vol. 2023, n° 7, p. 33. doi: 10.1007/jhep07(2023)033
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Article (Published version)
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ISSN of the journal1029-8479
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