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 29fb⁻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, R_tt⁻/Z = 1.145 ± 0.003 (stat.) ± 0.021 (syst.) ± 0.002 (lumi.) is consistent with the Standard Model prediction using the PDF4LHC21 PDF set.

Zur Veröffentlichung:  
Phys. Lett. B 848 (2023) 138376

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