W and Z boson production in pp̅ collisions at √s = 1.8 TeV

The inclusive cross sections times leptonic branching ratios for W and Z boson production in pp collisions at √s=1.8 TeV were measured using the D0 detector at the Fermilab Tevatron collider: σ W B(W→eν)=2.36±0.07±0.13 nb, σ W B(W→μν)=2.09±0.23±0.11 nb, σ Z B(Z→e + e - )=0.218±0.011±0.012 nb, and σ Z B(Z→μ + μ - )=0.178±0.030±0.009 nb. The first error is the combined statistical and systematic uncertainty, and the second reflects the uncertainty in the luminosity. For the combined electron and muon analyses we find σ W B(W→lν)/σ Z B(Z→l + l - )=10.90±0.49. Assuming standard model couplings, this result is used to determine the width of the W boson, γ(W)=2.044±0.093GeV.