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Production and decay of a Z particle, one of the carrier particles of the weak nuclear force, in the OPAL detector at CERN, the particle physics laboratory outside Geneva. The computer display shows the cylindrical detector in cross-section (white dotted circles). An electron and positron, accelerated to high energy in CERN's LEP collider, have annihilated at centre to create a Z particle. The neutral Z lives too briefly to be seen, but gives rise in its turn to the sprays of particles represented by the blue tracks and yellow blocks. This was one of the first events recorded by OPAL when the LEP collider started operations in 1989.
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