Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-09-07
Phys.Lett.B493:249-265,2000
Physics
High Energy Physics
High Energy Physics - Experiment
22 pages, 5 figures, submitted to Phys. Lett. B
Scientific paper
10.1016/S0370-2693(00)01085-6
From a data sample of 183 pb^-1 recorded at a center-of-mass energy of roots = 189 GeV with the OPAL detector at LEP, 3068 W-pair candidate events are selected. Assuming Standard Model W boson decay branching fractions, the W-pair production cross section is measured to be sigmaWW = 16.30 +- 0.34(stat.) +- 0.18(syst.) pb. When combined with previous OPAL measurements, the W boson branching fraction to hadrons is determined to be 68.32 +- 0.61(stat.) +- 0.28(syst.) % assuming lepton universality. These results are consistent with Standard Model expectations.
Abbiendi Giovanni
collaboration The OPAL
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