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The inclusive top-quark-pair production cross section $\sigma_{t\bar{t}}$ andits ratio to the $Z$-boson production cross section have been measured inproton--proton collisions at $\sqrt{s} = 13.6$ TeV, using 29 fb${}^{-1}$ ofdata 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 sectionis measured to be $\sigma_{t\bar{t}} = 850 \pm 3\mathrm{(stat.)}\pm18\mathrm{(syst.)}\pm 20\mathrm{(lumi.)}$ pb. The ratio of the $t\bar{t}$ andthe $Z$-boson production cross sections is also measured, where the $Z$-bosoncontribution is determined for inclusive $e^+e^-$ and $\mu^+\mu^-$ events in afiducial phase space. The relative uncertainty on the ratio is reduced comparedto the $t\bar{t}$ cross section, thanks to the cancellation of severalsystematic uncertainties. The result for the ratio, $R_{t\bar{t}/Z} = 1.145 \pm0.003\mathrm{(stat.)}\pm 0.021\mathrm{(syst.)}\pm 0.002\mathrm{(lumi.)}$ isconsistent with the Standard Model prediction using the PDF4LHC21 PDF set.

cornell university

Measurement of the $t\bar{t}$ cross section and its ratio to the $Z$  production cross section using $pp$ collisions at $\sqrt{s} = 13.6$ TeV with  the ATLAS detector