e+e- -> W+W- -> quark + antiquark + quark + antiquark -> jet + jet + jet + jet
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This event was the first ever of its type to occur in an electron - positron collider such as LEP at CERN. From the W+W- pair produced by the electron - positron annihilation, two quark - antiquark pairs were formed, each of which gave rise straight away to a jet consisting of many different particles.

Particle Physics Education CD-ROM 1999 CERN