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Scientific article
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English

Evidence for the charge asymmetry in pp t\overline{t} production at \sqrt{s} = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 8, 77
Publication date2023
First online date2023-08-16
Abstract

Inclusive and differential measurements of the top–antitop ($ t\overline{t} $) charge asymmetry $ {A}_{\textrm{C}}^{t\overline{t}} $ and the leptonic asymmetry $ {A}_{\textrm{C}}^{\ell \overline{\ell}} $ are presented in proton–proton collisions at $ \sqrt{s} $ = 13 TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider. The measurement uses the complete Run 2 dataset, corresponding to an integrated luminosity of 139 fb$^{−1}$, combines data in the single-lepton and dilepton channels, and employs reconstruction techniques adapted to both the resolved and boosted topologies. A Bayesian unfolding procedure is performed to correct for detector resolution and acceptance effects. The combined inclusive $ t\overline{t} $ charge asymmetry is measured to be $ {A}_{\textrm{C}}^{t\overline{t}} $ = 0.0068 ± 0.0015, which differs from zero by 4.7 standard deviations. Differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the $ t\overline{t} $ system. Both the inclusive and differential measurements are found to be compatible with the Standard Model predictions, at next-to-next-to-leading order in quantum chromodynamics perturbation theory with next-to-leading-order electroweak corrections. The measurements are interpreted in the framework of the Standard Model effective field theory, placing competitive bounds on several Wilson coefficients.

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Keywords
  • Hadron-Hadron Scattering
  • Top Physics
  • P p: colliding beams
  • Top: pair production
  • Charge: asymmetry
  • Detector: resolution
  • Electroweak interaction: correction
  • Quantum chromodynamics: perturbation theory
  • Charge: asymmetry: measured
  • Perturbation theory: higher-order
  • Higher-order: 1
  • Higher-order: 2
  • P p: scattering
  • ATLAS
  • Final state: ((n)jet dilepton)
  • Longitudinal
  • CERN Lab
  • Acceptance
  • Transverse momentum dependence
  • Mass dependence
  • Wilson
  • CERN LHC Coll
  • Statistical analysis: Bayesian
  • Effective field theory
  • Topology
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Evidence for the charge asymmetry in <i>pp</i> → <i> t\overline{t} </i> production at <i> \sqrt{s} </i> = 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, n° 8, p. 77. doi: 10.1007/jhep08(2023)077
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Article (Published version)
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ISSN of the journal1029-8479
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