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L3 particle detector. View of one end of the L3 detector at CERN, Europe's largest particle physics laboratory. L3 is situated on the 27-km Large Electron Positron (LEP) accelerator ring, part of the beam tube of which may be seen entering the detector from lower left. The vast semicircular end door of the detector is seen opened here to allow maintenance operations to be performed. Experiments performed by L3 include the study of the Z-nought vector boson, one of the carriers of the electroweak force.
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