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A Measurement of the rate of charm production in WW decays

Collaboration
Jul, 2000
19 pages
Published in:
  • Phys.Lett.B 490 (2000) 71-86
e-Print:
DOI:
Report number:
  • CERN-EP-2000-100
Experiments:
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Abstract: (Elsevier)
Using data recorded at centre-of-mass energies around 183 and 189 GeV with the OPAL detector at LEP, the fundamental coupling of the charm quark to the W boson has been studied. The ratio R c W ≡Γ ( W → c X )/Γ ( W → hadrons ) has been measured from jet properties, lifetime information, and leptons produced in charm decays. A value compatible with the Standard Model expectation of 0.5 is obtained: R c W =0.481±0.042 (stat.) ±0.032 (syst.) . By combining this result with measurements of the W boson total width and hadronic branching ratio, the magnitude of the CKM matrix element | V cs | is determined to be | V cs |=0.969±0.058.
Note:
  • 18 pages, 4 figures, submitted to Phys. Lett. B Report-no: CERN-EP-2000-100
  • electron positron: colliding beams
  • electron positron: annihilation
  • W: pair production
  • W: hadronic decay
  • production: charm
  • W: branching ratio
  • coupling: (W charm)
  • CKM matrix matrix
  • OPAL
  • experimental results
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