Measurements of the decay of the Z 0 into lepton pairs
Abstract
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 Γee=89±4±4 MeV, Γμμ=85±9±6 MeV and Γττ=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 Γhad=1787±81±90 MeV and an invisible width Γinv=552±85±71 MeV.
- Publication:
-
Physics Letters B
- Pub Date:
- February 1990
- DOI:
- 10.1016/0370-2693(90)91982-H
- Bibcode:
- 1990PhLB..235..379A