Abstract
We have measured the resonance parameters of the Z boson using 480 Hadronic and Leptonic Z decays collected by the Mark II Detector at the Stanford Linear Collider. We find the Mass to be 91.14±0.12 GeV/c 2, and width to be 2.42 −0.35 +0.45 GeV. If we constrain the visible width to its Standard Model value, we find a partial width to invisible decay modes corresponding to 2.8±0.6 nèutrino species with a 95% confidence level limit of 3.9.
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