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Measurement of the t t ¯ production cross-section in the lepton+jets channel at s = 13 TeV with the ATLAS experiment

et al.
Abstract

The top anti-top quark production cross-section is measured in the lepton+jets channel using proton–proton collision data at a centre-of-mass energy of s = 13 TeV collected with the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 139 fb−1. Events with exactly one charged lepton and four or more jets in the final state, with at least one jet containing b-hadrons, are used to determine the t t ¯ production cross-section through a profile-likelihood fit. The inclusive cross-section is measured to be σ inc = 830 ± 0.4 (stat.) ± 36 (syst.) ± 14 (lumi.) pb with a relative uncertainty of 4.6%. The result is consistent with theoretical calculations at next-to-next-to-leading order in perturbative QCD. The fiducial t t ¯ cross-section within the experimental acceptance is also measured.

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