Measurement of the t¯t production cross-section in pp collisions at √s = 5.02 TeV with the ATLAS detector

ATLAS Publications, T.M. Carter, R.Y. Gonzalez Andana, A. Hasib, M.P. Heath, S. Palazzo, V.A. Parrish, E.A. Pender, E.P. Takeva, N. Themistokleous, E.M. Villhauer, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The inclusive top-quark pair (t¯t) production cross-section σt¯t is measured in
proton–proton collisions at a centre-of-mass energy √s = 5.02 TeV, using 257 pb−1 of data collected in 2017 by the ATLAS experiment at the LHC. The t¯t cross-section is measured in both the dilepton and single-lepton final states of the t¯t system and then combined. The combination of the two measurements yields σt¯t = 67.5 ± 0.9 (stat.) ± 2.3 (syst.) ± 1.1 (lumi.) ± 0.2 (beam) 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 loga-
rithmic soft-gluon terms, and constrains the parton distribution functions of the proton at large Bjorken-x.
Original languageEnglish
Article number138
Pages (from-to)1-53
Number of pages53
Journal Journal of High Energy Physics
Issue number6
Publication statusPublished - 23 Jun 2023

Keywords / Materials (for Non-textual outputs)

  • Hadron-Hadron Scattering
  • Top Physics


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