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

Abbiendi, G. et al. (2007) Measurement of the e+e-→W+W- cross section and W decay branching fractions at LEP. The European Physical Journal C, 52 (4). pp. 767-785. ISSN 1434-6044

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Abstract

From a total data sample of 701.1 pb-1 recorded with e+e- centre-of-mass energies of Ös =s= 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: \textdata/\textSM = 1.002±0.011 (\textstat.) ±0.007 (\textsyst.) ±0.005 (\texttheory)dataSM=10020011(stat.)0007(syst.)0005(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 0.969±0.017(stat.)±0.012(syst.). The differential cross section as a function of the W- production angle is measured for the qqeν and qqμν final states. The results described in this paper are consistent with the expectations from the standard model.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
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Depositing User: Sharon Beastall
Date Deposited: 07 Jul 2011 11:23
Last Modified: 07 Jul 2011 11:23
URI: http://eprints.hud.ac.uk/id/eprint/10915

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