Electroweak Measurements in Electron-Positron Collisions at W-Boson-Pair Energies at LEP
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S. Schael
- Function : Author
P. Antilogus
- Function : Author
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- IdHAL : pierre-antilogus
- ORCID : 0000-0002-0389-5706
- IdRef : 116029315
P. Achard
- Function : Author
D. Teyssier
- Function : Author
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- ORCID : 0000-0002-6261-5292
G. Abbiendi
- Function : Author
C. Bérat
- Function : Author
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- IdHAL : corinne-berat
- ORCID : 0000-0001-8294-6294
- IdRef : 033505187
C. Goy
- Function : Author
- PersonId : 740078
- IdHAL : goycorinne
- ORCID : 0000-0002-1297-8925
- IdRef : 092030998
S. Jézéquel
- Function : Author
- PersonId : 739301
- IdHAL : stephane-jezequel
- ORCID : 0000-0001-7369-6975
- IdRef : 074440926
Ziad Zj Ajaltouni
- Function : Author
- PersonId : 903794
O. Deschamps
- Function : Author
- PersonId : 12089
- IdHAL : olivier-deschamps
- ORCID : 0000-0002-7047-6042
- IdRef : 161447368
Alain Falvard
- Function : Author
- PersonId : 864513
Pascal Gay
- Function : Author
- PersonId : 829302
Pierre Henrard
- Function : Author
- PersonId : 829303
Pascal Perret
- Function : Author
- PersonId : 739797
- IdHAL : pascal-perret
- ORCID : 0000-0002-5732-4343
Abstract
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, $M_W$ and $\Gamma_W$, the branching fraction of W decays to hadrons, $B(W\to\mathrm{had})$, and the trilinear gauge-boson self-couplings $g^Z_1$, $\kappa_\gamma$ and $\lambda_\gamma$ are determined to be: M_W = 80.376 \pm 0.033 ~GeV \Gamma_W = 2.195 \pm 0.083 ~GeV B(W\to\mathrm{had}) = 67.41 \pm 0.27 % g^Z_1 = 0.984 ^{+0.018}_{-0.020} \kappa_\gamma = 0.982 \pm 0.042 \lambda_\gamma = -0.022 \pm 0.019