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Experiments at LEP

The LEP accelerator had four interaction points. The detectors were named: ALEPH, DELPHI, L3 and OPAL. The first collaboration to register the collisions was OPAL, followed by ALEPH and L3. The DELPHI collaboration saw the first collisions one day later because of a misadjusted magnet in the accelerator that prevented the particles from colliding at that interaction point.