= UA2 experiment
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The 1983 <UA2 experiment> <Z boson> paper reports eight candidate <Electron> pairs, including radiative decays, at $\sqrt{s}=550\,\mathrm{GeV}$. Four events entered its <invariant mass> determination. The published result was $91.9\pm1.3\pm1.4\,\mathrm{GeV}/c^2$, the second uncertainty systematic. These are that paper's reported numbers, not inputs fitted to the illustration below.<Evidence for Z0 → e+e− at the CERN proton-antiproton collider by P. Bagnaia>[Physics Letters B 129 (1983), pp.130–140, abstract: eight candidates, four-event mass determination and stated uncertainties]{ref}
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