W properties and decays at LEP2

G. Bella*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Preliminary results from W-pair events measured by the four LEP experiments are presented. These results are based on data taken during years 1996-2000 at e+e- centre-of-mass energies between 161-208 GeV and corresponding to a total integrated luminosity of 560 pb-1. A total number of about 7500 W-pair candidates per experiment is used to determine the W decay branching fractions, which are used to test lepton universality to a 1.6% accuracy level. Hadronic decays of W into charm are identified and the fraction of charm decay is 0.494±0.044, corresponding to the CKM matrix element value |Vcs|=0.96±0.08. The W mass is measured to be 80.427±0.046 GeV, in agreement with other determinations of this value. The measured value of the W width is ΓW=2.12±0.11 GeV. All results agree with the Standard Model expectations.

Original languageEnglish
Pages (from-to)227-234
Number of pages8
JournalNuclear Physics B - Proceedings Supplements
Issue number1-3
StatePublished - Apr 2001


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