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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Crédit: | Science Photo Library / Cern |
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