Measurement of the inclusive cross sections for W and Z boson production in proton-proton collisions at s = 5. 02 and 13 TeV

Measurements of fiducial and total inclusive cross sections for W and Z boson production are presented in proton-proton collisions at s = 5. 02 and 13 TeV. Electron and muon decay modes (ell = e or) are studied in the data collected with the CMS detector in 2017, in dedicated runs with reduced instantaneous luminosity. The data sets correspond to integrated luminosities of 298 6 pb^-1 at 5. 02 TeV and 206 5 pb^-1 at 13 TeV. Measured values of the products of the total inclusive cross sections and the branching fractions at 5. 02 TeV are (pp W+X) B (W) = 7300 10 (stat) 60 (syst) 140 (lumi) pb, and (pp Z+X) B (Z ^+^-) = 669 2 (stat) 6 (syst) 13 (lumi) pb for the dilepton invariant mass in the range of 60-120 GeV. The corresponding results at 13 TeV are 20480 10 (stat) 170 (syst) 470 (lumi) pb and 1952 4 (stat) 18 (syst) 45 (lumi) pb. The measured values agree with cross section calculations at next-to-next-to-leading-order in perturbative quantum chromodynamics. Fiducial and total inclusive cross sections, ratios of cross sections of W^+ and W^- production as well as inclusive W and Z boson production, and ratios of these measurements at 5. 02 and 13 TeV are reported.