Discovery of the $Z^{0}$ at CERN also yields anomalous events

NOV 01, 1983

Once the W particle was reported in January, it was almost inevitable that the $Z^{0}$ particle would eventually be found, provided that both the CERN collider and the two detector groups worked long and hard enough. The discovery of $Z^{0},$ the neutral intermediate vector boson, was announced on 1 June; the UA1 group said it found five $Z^{0}$ events. The 270‐GeV protons colliding with 270‐GeV antiprotons had produced four events in which the $Z^{0}$ decayed into an electron‐positron pair and one in which the $Z^{0}$ decayed into a $μ^{+} μ^{-}$ pair. On 15 July, the UA2 group also reported finding the $Z^{0} .$

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