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

, ALEPH Collaboration and , DELPHI Collaboration and , L3 Collaboration and , OPAL Collaboration and , LEP Electroweak Working Group (2013) Electroweak measurements in electron–positron collisions at W-boson-pair energies at LEP. Physics Reports, 532 (4). pp. 119-244. ISSN 0370-1573

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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.

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Physics Reports
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16 Nov 2016 15:16
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12 Jan 2021 04:45