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W+W− production cross section and W branching fractions in e+e− collisions at 189 GeV

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • OPAL Collaboration
<mark>Journal publication date</mark>16/11/2000
<mark>Journal</mark>Physics Letters B
Issue number17
Number of pages17
Pages (from-to)249-265
Publication StatusPublished
<mark>Original language</mark>English


From a data sample of 183 pb−1 recorded at a center-of-mass energy of √s = 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 σWW = 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.