  DO 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
pbar-p collisions at sqrt{s}=1.8 TeV are sigma_W*B(W->e nu) =
2.36+-0.02+-0.08+-0.13 nb, sigma_W*B(W->mu nu) = 2.09+-0.06+-0.22+-0.11 nb,
sigma_Z*B(Z->e+ e-) = 0.218+-0.008+-0.008+-0.012 nb, and sigma_Z*B(Z->mu+ mu-)
= 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 sigma_W*B(W->l
mu)/sigma_Z*B(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 Gamma(W) =
2.044+-0.097 GeV.
