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Title

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

AuthorsFernández Menéndez, Javier ; Gómez-Ceballos, Guillelmo; Marco, Jesús ; Marco, Rafael ; Martínez-Rivero, Celso ; Matorras, Francisco ; Piedra, Jonatan ; Rivero, M.; Rodríguez, David; Costa, María José ; Ferrer, Antonio ; Fuster, Juan ; García García, Carmen ; Oyanguren, Arantza ; Perepelitsa, Vassil; Salt, José ; Tortosa, Pablo
KeywordsElectron–positron physics
Decays of heavy intermediate gauge bosons
Electroweak interactions
Issue Date30-Nov-2013
PublisherElsevier
CitationPhysics Reports 532(4): 119-244 (2013)
AbstractElectroweak 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 W W and Z Z 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 W W 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 g1 Z, 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% g1 Z=0.9840+0.018 -0.020 κγ=0.982±0.042λγ=-0.022±0.019.
DescriptionThe ALEPH, DELPHI, L3, OPAL collaborations and LEP Electroweak Working Group.-- arXiv:1302.3415
Publisher version (URL)http://dx.doi.org/10.1016/j.physrep.2013.07.004
URIhttp://hdl.handle.net/10261/109262
DOI10.1016/j.physrep.2013.07.004
Identifiersissn: 0370-1573
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(IFCA) Artículos
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