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Scientific article
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English

Measurement of the $ t\overline{t} $ production cross-section in pp collisions at $ \sqrt{s} $ = 5.02 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 6, 138
Publication date2023
First online date2023-06-23
Abstract

The inclusive top-quark pair ($ t\overline{t} $) production cross-section $ {\sigma}_{t\overline{t}} $ is measured in proton–proton collisions at a centre-of-mass energy $ \sqrt{s} $ = 5.02 TeV, using 257 pb$^{−1}$ of data collected in 2017 by the ATLAS experiment at the LHC. The $ t\overline{t} $ cross-section is measured in both the dilepton and single-lepton final states of the $ t\overline{t} $ system and then combined. The combination of the two measurements yields$ {\sigma}_{t\overline{t}}=67.5\pm 0.9\left(\textrm{stat}.\right)\pm 2.3\left(\textrm{syst}.\right)\pm 1.1\left(\textrm{lumi}.\right)\pm 0.2\left(\textrm{beam}\right)\textrm{pb}, $where the four uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, and imperfect knowledge of both the integrated luminosity and the LHC beam energy, giving a total uncertainty of 3.9%. The result is in agreement with theoretical quantum chromodynamic calculations at next-to-next-to-leading order in the strong coupling constant, including the resummation of next-to-next-to-leading logarithmic soft-gluon terms, and constrains the parton distribution functions of the proton at large Bjorken-x.

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Keywords
  • Hadron-Hadron Scattering
  • Top Physics
  • P p: colliding beams
  • Top: pair production
  • Parton: distribution function
  • P p: scattering
  • Beam: energy
  • Strong interaction: coupling constant
  • P: distribution function
  • Channel cross section: measured
  • Quantum chromodynamics: perturbation theory
  • Perturbation theory: higher-order
  • Higher-order: 2
  • CERN LHC Coll
  • ATLAS
  • Final state: ((n)jet lepton)
  • Final state: ((n)jet dilepton)
  • Resummation
  • Bjorken
  • Strong coupling
  • Experimental results
  • 5020 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Measurement of the $ t\overline{t} $ production cross-section in pp collisions at $ \sqrt{s} $ = 5.02 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, n° 6, p. 138. doi: 10.1007/jhep06(2023)138
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ISSN of the journal1029-8479
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