Z<SUP>0</SUP> parameters and M top from LEP 1990 data

The four detectors ALEPH, DELPHI, L3 and OPAL have collected ≈550,000 Z0 decays during the LEP run in 1990. We have made model-independent simultaneous fits to the LEP data to determine the Z0 parameters. The mass and widths of Z0 are Mz=91.177± 0.006±0.02(LEP) GeV, Γz=2.481±0.010 GeV, Γhad=1.734±0.010 GeV and Γlept=83.0 ± 0.4 MeV. The number of ν families is determined to be Nν=3.01±0.05. Simultaneous fits are performed within the Standard Model framework to the LEP data and constraining the value of sin2 θw from the P̅P colliders we get the following values for top mass, electroweak mixing angle sin2 θw and the radiative correction Δr : Mtop = 123+33−38 ± 19 (Higgs) GeV, n2 θw=0.230 ±0.004 and Δr=0.056 ±0.011