Measurement of the Z 0 line shape parameters and the electroweak couplings of charged leptons
Abstract
We report on an improved measurement of the mass of the Z 0 boson, its total width and its partial decay widths into hadrons and leptons, as well as the effective axial vector and vector couplings to charged leptons. These measurements are based on a data set of approximately 160 000 hadronic Z 0 decays and 18 000 decays into electrons, muons and taus, recorded by the OPAL experiment at centre of mass energies near the mass of the Z 0. The total width and the partial widths to visible final states, derived from the measured cross sections, are used to extract the invisible width. The effective couplings of the Z 0 to charged leptons are studied using measurements of the lepton pair cross sections and forward-backward asymmetries at the different centre of mass energy points of the Z 0 scan. The implications of our results in the context of the Standard Model are discussed.
- Publication:
-
Zeitschrift fur Physik C Particles and Fields
- Pub Date:
- June 1991
- DOI:
- 10.1007/BF01560437
- Bibcode:
- 1991ZPhyC..52..175A