https://doi.org/10.1140/epjc/s2004-02048-3
experimental physics
Measurement of W-pair production in e + e- collisions at centre-of-mass energies from 183 to 209 GeV
The W + W- production cross section is measured from a data sample corresponding to a total integrated luminosity of 683 pb-1, collected by the ALEPH experiment at LEP at centre-of-mass energies from 183 to 209 GeV. Individual cross sections for the different topologies arising from W decays into leptons or hadrons, as well as the total W-pair cross section are given at eight centre-of-mass energies. The results are found to be in agreement with recently developed Standard Model calculations at the one percent level. The hadronic branching fraction of the W boson is measured to be 
= 67.13 
0.37(stat.) 0.15(syst.)%, from which the CKM matrix element 
is determined to be 0.958 0.017(stat.) 0.008(syst.)
© Springer-Verlag, 2004
