R. Akers et al., IMPROVED MEASUREMENTS OF THE NEUTRAL-CURRENT FROM HADRON AND LEPTON PRODUCTION AT LEP, Zeitschrift fur Physik. C, Particles and fields, 61(1), 1994, pp. 19-34
We present an update with increased statistics to our published analys
is of hadronic and leptonic cross sections and of the leptonic forward
-backward asymmetries in e+e- collisions. The published results were b
ased on a total of 454 000 hadronic and 58 000 leptonic events. This a
nalysis adds 733 000 hadronic and 88 000 leptonic events recorded at t
he Z0 peak in 1992 by the OPAL experiment at LEP. A model independent
analysis of Z0 parameters based on an extension of the improved Born a
pproximation leads to tests of lepton universality and gives an interp
retation of the results within the Standard Model framework. We also p
resent a model independent test for new physics.