Measurement of the Decay of the $\Z^0$ Into Lepton Pairs

We report on a measurement of the processes e + e − →e + e − , e + e − → μ + μ − , and e + e − → τ + τ − near the Z 0 pole. On the basis of 163 e + e − , 101 μ + μ − and 87 τ + τ − events we obtain Γ ee =89±4±4 MeV, Γ μμ =85±9±6 MeV and Γ ττ =87±10±8 MeV, compatible with the standard model. Combining these with our previous results on hadronic Z 0 decays, we find a hadronic width Γ had =1787±81±90 MeV and an invisible width Γ inv =552±85±71 MeV.

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: leptonic decay
Z0: width
universality: (tau muon electron)
cross section: energy dependence
OPAL
experimental results
CERN LEP Stor

References(10)

Figures(0)

Measurement of the $Z^0$ Mass and Width with the OPAL Detector at LEP

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Measurement of the Decay of the Z0\Z^0Z0 Into Lepton Pairs

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Measurement of the Decay of the $\Z^0$ Into Lepton Pairs