Measurement of the e+e- -> W+W- cross section and W decay branching fractions at LEP

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dc.creatorThe OPAL collaboration
dc.date2007-08-09
dc.date.accessioned2026-07-07T11:52:55Z
dc.date.available2026-07-07T11:52:55Z
dc.descriptionFrom a total data sample of 701.1 pb^-1 recorded with e+e- centre-of-mass energies of sqrt = 161-209 GeV with the OPAL detector at LEP, 11693 W-pair candidate events are selected. These data are used to obtain measurements of the W-pair production cross sections at 10 different centre-of-mass energies. The ratio of the measured cross sections to the Standard Model expectation is found to be: data/SM = 1.002 +- 0.011(stat.) +- 0.007(syst.) +- 0.005(theory), where the uncertainties are statistical, experimental systematics and theory systematics respectively. The data are used to determine the W boson branching fractions, which are found to be consistent with lepton universality of the charged current interaction. Assuming lepton universality, the branching ratio to hadrons is determined to be 67.41 +- 0.37(stat.) +- 0.23(syst.)%, from which the CKM matrix element Vcs is determined to be 0.96+-0.017(stat.)+-0.012(syst.). The differential cross section as a function of the W^- production angle is measured for the qqev and qqmv final states. The results described in this paper are consistent with the expectations from the Standard Model.
dc.description23 pages, 5 figures, Submitted to Eur Phys J.C
dc.identifierhttps://arxiv.org/abs/0708.1311
dc.identifierhttp://arxiv.org/abs/0708.1311
dc.identifierEur.Phys.J.C52:767-785,2007
dc.identifierdoi:10.1140/epjc/s10052-007-0442-0
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204351
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of the e+e- -> W+W- cross section and W decay branching fractions at LEP
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