Discovery of the $Z0$ at CERN also yields anomalous events

Once the W particle was reported in January, it was almost inevitable that the $Z0$ particle would eventually be found, provided that both the CERN collider and the two detector groups worked long and hard enough. The discovery of $Z0,$ the neutral intermediate vector boson, was announced on 1 June; the UA1 group said it found five $Z0$ events. The 270‐GeV protons colliding with 270‐GeV antiprotons had produced four events in which the $Z0$ decayed into an electron‐positron pair and one in which the $Z0$ decayed into a $μ+μ−$ pair. On 15 July, the UA2 group also reported finding the $Z0.$