Electroweak measurements in electron positron collisions at W-boson-pair energies at LEPVisa övriga samt affilieringar
2013 (Engelska)Ingår i: Physics Reports-Review Section of Physics Letters, ISSN 0370-1573, Vol. 532, nr 4, s. 119-244Artikel, forskningsöversikt (Refereegranskat) Published
Abstract [en]
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, 13 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 -> had), and the trilinear gauge-boson self-couplings g(1)(Z), K-gamma and lambda(gamma), are determined to be: m(w) = 80.376 +/- 0.033 GeV Gamma(w) = 2.195 +/- 0.083 GeV B(W -> had) = 67.41 +/- 0.27% g(1)(Z) = 0.984(-0.020)(+0.018) K-gamma - 0.982 +/- 0.042 lambda(gamma) = 0.022 +/- 0.019.
Ort, förlag, år, upplaga, sidor
2013. Vol. 532, nr 4, s. 119-244
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:uu:diva-216942DOI: 10.1016/j.physrep.2013.07.004ISI: 000328723800001OAI: oai:DiVA.org:uu-216942DiVA, id: diva2:691373
Anmärkning
The ALEPH Collaboration, The DELPHI Collaboration, The L3 Collaboration, The OPAL Collaboration, The LEP Electroweak Working Group: for complete list of authors see http://dx.doi.org/10.1016/j.physrep.2013.07.004.
2014-01-272014-01-272014-01-27Bibliografiskt granskad