Measurement of inclusive W and Z boson production cross sections in pp collisions at sqrt(s)=13 TeV

A measurement of total inclusive and fiducial $\mathrm{W}$ and $\mathrm{Z}$ boson production cross sections in $\mathrm{p}\mathrm{p}$ collisions at $\sqrt{s}=13$ TeV is presented. Electron and muon final states are studied in a data sample collected with the CMS detector corresponding to an integrated luminosity of up to $43 \pm 2 \mathrm{pb}^{-1}$. The measured total inclusive cross sections times branching fractions are $\sigma(\mathrm{p}\mathrm{p} \to \mathrm{W}^+ X) \times \mathcal{B}(\mathrm{W}^+ \to \ell^+\nu)$ = 11370 $\pm$ 50 (stat) $\pm$ 230 (syst) $\pm$ 550 (lumi) pb, $\sigma(\mathrm{p}\mathrm{p} \to \mathrm{W}^- X) \times \mathcal{B}(\mathrm{W}^- \to \ell^-\bar{\nu}) =$ 8580 $\pm$ 50 (stat) $\pm$ 160 (syst) $\pm$ 410 (lumi) pb, and $\sigma(\mathrm{p}\mathrm{p} \to \mathrm{Z} X) \times \mathcal{B}(\mathrm{Z} \to \ell^+\ell^-) =$ 1910 $\pm$ 10 (stat) $\pm$ 40 (syst) $\pm$ 90 (lumi) pb for the dilepton mass in the range of 60 to 120 GeV. The measured values agree with next-to-next-to-leading-order QCD cross section calculations. Inclusive cross sections and ratios of cross sections are reported.