Abstract
We present measurements by the Mark II experiment of the ratios of the leptonic partial widths of the Z boson to the hadronic partial width. The results are /=0., &=0., and /=0., in good agreement with the standard-model prediction of 0.048. From the average leptonic width result, /=0., we derive =1. GeV. We find for the vector coupling constants of the tau and muon =0.31±0. and =0.05±0..
- Received 24 October 1989
DOI:https://doi.org/10.1103/PhysRevLett.63.2780
©1989 American Physical Society