Measurement of W and Z boson production cross sections in pp¯ collisions at s=1.8 TeV

DØ has measured the inclusive production cross section of W and Z bosons in a sample of 13 pb^-1 of data collected at the Fermilab Tevatron. The cross sections, multiplied by their leptonic branching fractions, for production in pp¯ collisions at s=1.8 TeV are σ_WB(W-->eν)=2.36+/-0.02+/-0.08+/-0.13 nb, σ_WB(W-->μν)=2.09+/-0.06+/-0.22+/-0.11 nb, σ_ZB(Z-->e⁺e^-)=0.218+/-0.008+/-0.008+/-0.012 nb, and σ_ZB(Z-->μ⁺μ^-)=0.178+/-0.022+/-0.021+/-0.009 nb, where the first uncertainty is statistical and the second systematic; the third reflects the uncertainty in the integrated luminosity. For the combined electron and muon analyses, we find σ_WB(W-->lν)/σ_ZB(Z-->l⁺l^-)=10.90+/-0.52. Assuming standard model couplings, we use this result to determine the width of the W boson, and obtain Γ(W)=2.044+/-0.097 GeV.