DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Z particle decay. UA1 detector at CERN, the European particle physics laboratory outside Geneva, showing the decay of a Z particle into two muons (long white lines) & two jets of other part- icles. The Z particle, which lives too briefly to be visible itself, was created in a high-energy collision of a proton & antiproton in CERN's Super-Proton-Synchrotron (SPS) collider. The elec- trically neutral Z is a gauge boson & one of the carriers of the weak force. Its discovery at CERN in 1983 confirmed the "electroweak" theory that unifies the electromagnetic & weak forces. The display outlines the UA1 detector in red. Event 831).
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