W+W- production and triple gauge boson couplings at LEP energies up to 183 GeV

The OPAL Collaboration

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54 Scopus citations


A study of W-pair production in e+e- annihilations at LEP is presented, based on 877 W+W- candidates corresponding to an integrated luminosity of 57pb-1 at √s = 183 GeV. Assuming that the angular distributions of the W-pair production and decay, as well as their branching fractions, are described by the Standard Model, the W-pair production cross-section is measured to be 15.43 ± 0.61(stat.) ± 0.26(syst.) pb. Assuming lepton universality and combining with our results from lower centre-of-mass energies, the W branching fraction to hadrons is determined to be 67.9 ± 1.2(stat.) ± 0.5(syst.)%. The number of W-pair candidates and the angular distributions for each final state (qq̄l̄νl, qq̄qq̄, l̄νll′ν̄l′) are used to determine the triple gauge boson couplings. After combining these values with our results from lower centre-of-mass energies we obtain Δκγ = 0.11+0.52-0.37, Δgz1 = 0.01+0.13-0.12 and λ = -0.10+0.13-0.12, where the errors include both statistical and systematic uncertainties and each coupling is determined by setting the other two couplings to the Standard Model value. The fraction of W bosons produced with a longitudinal polarisation is measured to be 0.242 ± 0.091(stat.) ± 0.023(syst.). All these measurements are consistent with the Standard Model expectations.

Original languageEnglish
Pages (from-to)191-215
Number of pages25
JournalEuropean Physical Journal C
Issue number2
StatePublished - 1 Jan 1999
Externally publishedYes

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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