W particle decay. Computer graphic display of an event from the UA1 detector at CERN, the European particle physics laboratory outside Geneva, show- ing the decay of a W particle into an electron (blue track) & a neutrino (reconstructed blue track going upwards & ending in arrow), with other particle tracks in yellow & red. The W, which lives too briefly to be visible, was created in a high-energy proton-antiproton collision in CERN's Super-Proton-Synchrotron collider. A gauge boson & one of the carriers of the weak force, the W's 1983 discovery at CERN helped confirm the 'electr- oweak' theory unifying the electromagnetic & weak forces. The UA1 detector is outlined in red. (Run 6069, Event 228)

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