Measurement of vector boson production cross sections and their ratios using pp collisions at √s = 13.6 TeV with the ATLAS detector

Fiducial and total W^± and Z boson cross sections, their ratios and the ratio of top-antitop-quark pair and W-boson fiducial cross sections are measured in proton–proton collisions at a centre-of-mass energy of √s = 13.6 TeV, corresponding to an integrated luminosity of 29 fb⁻¹ of data collected in 2022 by the ATLAS experiment at the Large Hadron Collider. The measured fiducial cross-section values for W⁺ → ι⁺ ν^- , W^-  →, ι⁺ , and Z → ι⁺ ι^-  (ι  = eor μ) boson productions are 4250 ± 150 pb, 3310 ± 120 pb, and 744 ± 20 pb, 
respectively, where the uncertainty is the total uncertainty, including that arising from the luminosity of about 2.2%. The measurements are in agreement with Standard-Model predictions calculated at next-to-next-to-leading-order in a_s
, next-to-next-to-leading logarithmic accuracy and next-to-leading-order electroweak accuracy.