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Scientific article
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English

Measurement of the tt¯ cross section and its ratio to the Z production cross section using pp collisions at s=13.6 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inPhysics letters. B, vol. 848, 138376
Publication date2024
First online date2023-12-07
Abstract

The inclusive top-quark-pair production cross section σtt¯ and its ratio to the Z-boson production cross section have been measured in proton–proton collisions at s=13.6 TeV, using 29 fb−1 of data collected in 2022 with the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge electron-muon pair and b-tagged jets, and assuming Standard Model decays, the top-quark-pair production cross section is measured to be σtt¯=850±3(stat.)±18(syst.)±20(lumi.) pb. The ratio of the tt¯ and the Z-boson production cross sections is also measured, where the Z-boson contribution is determined for inclusive e+e− and μ+μ− events in a fiducial phase space. The relative uncertainty on the ratio is reduced compared to the tt¯ cross section, thanks to the cancellation of several systematic uncertainties. The result for the ratio, Rtt¯/Z=1.145±0.003(stat.)±0.021(syst.)±0.002(lumi.) is consistent with the Standard Model prediction using the PDF4LHC21 PDF set.

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Keywords
  • P p: colliding beams
  • Top: pair production
  • P p: scattering
  • Top: leptonic decay
  • Final state: ((n)jet dilepton)
  • Channel cross section: measured
  • Cross section: ratio: measured
  • Z0: leptonic decay
  • Electron: pair production
  • Muon: pair production
  • Jet: bottom
  • Bottom: particle identification
  • ATLAS
  • CERN LHC Coll
  • Phase space
  • Experimental results
  • 13600 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Measurement of the tt¯ cross section and its ratio to the Z production cross section using pp collisions at s=13.6 TeV with the ATLAS detector. In: Physics letters. B, 2024, vol. 848, p. 138376. doi: 10.1016/j.physletb.2023.138376
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Article (Published version)
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ISSN of the journal0370-2693
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