Abstract
The measurements of W-pair, WWγ and ZZ cross sections performed by the four experiments at the LEP collider are herein reported. The statistics collected in the period 1996-2000 amounts to about 40000 WW, 400 WWγ and 1000 ZZ events distributed over a large center-of-mass energy range of 161-209 GeV. From the WW cross section measurements, also the W branching fractions in leptons and hadrons are derived with a percent precision: BR(W→ qq) = 67.77 ± 0.18 ± 0.22% and BR(W→ lν)=10.74 ± 0.06 ± 0.07%. PACS: 12.15.Hh Determination of Kobayashi-Maskawa matrix elements – 12.15.Mm Neutral currents – 12.15.Lk Electroweak radiative corrections – 13.38.Be Decays of W bosons – 13.38.Dg Decays of Z bosons – 13.66.Fg Gauge and Higgs boson production in e-e+ interactions – 14.70.Fm W bosons – 14.70.Hp Z bosons
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