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Electroweak measurements in electron–positron collisions at W-boson-pair energies at LEP

Research output: Contribution to journalJournal article

  • ALEPH Collaboration
  • DELPHI Collaboration
  • L3 Collaboration
  • OPAL Collaboration
  • LEP Electroweak Working Group
<mark>Journal publication date</mark>30/11/2013
<mark>Journal</mark>Physics Reports
Issue number4
Number of pages126
Pages (from-to)119-244
Publication StatusPublished
<mark>Original language</mark>English


Electroweak measurements performed with data taken at the electron–positron collider LEP at CERN from 1995 to 2000 are reported. The combined data set considered in this report corresponds to a total luminosity of about 3 fb−1 collected by the four LEP experiments ALEPH, DELPHI, L3 and OPAL, at centre-of-mass energies ranging from 130 GeV to 209 GeV.

Combining the published results of the four LEP experiments, the measurements include total and differential cross-sections in photon-pair, fermion-pair and four-fermion production, the latter resulting from both double-resonant WW and ZZ production as well as singly resonant production. Total and differential cross-sections are measured precisely, providing a stringent test of the Standard Model at centre-of-mass energies never explored before in electron–positron collisions. Final-state interaction effects in four-fermion production, such as those arising from colour reconnection and Bose–Einstein correlations between the two W decay systems arising in WW production, are searched for and upper limits on the strength of possible effects are obtained. The data are used to determine fundamental properties of the W boson and the electroweak theory. Among others, the mass and width of the W boson, mW and ΓW, the branching fraction of W decays to hadrons, B(W → had), and the trilinear gauge-boson self-couplings gZ1, κγ and λγ are determined to be:
mW = 80.376 ± 0.033 GeV
ΓW = 2.195 ± 0.083 GeV
B(W → had) = 67.41 ± 0.27%
gZ1 = 0.984+0.018−0.020
κγ = 0.982 ± 0.042
λγ = −0.022 ± 0.019.