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Production and decay of a Z particle in the UA1 detector at CERN, the European particle physics laboratory outside Geneva. An unseen proton & antiproton, accelerated to high energy in CERN's SPS collider, have annihilated at the centre of the detector to produce two sprays of particles which go to left & right, showing up as the yellow & green tracks and red blocks. The collision also creates a neutral Z particle, which is unseen but reveals itself when it decays immediately into an electron & a positron (long white tracks). Discovered by CERN's UA1 & UA2 detectors in 1983, the Z particle is a gauge boson, one of the carrier particles of the weak nuclear force.
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