LEP reaches 200 GeV!
18 August 1999
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The Large Electron Positron Collider (LEP) has reached its ultimate maximum design energy. On 2 August 1999, the detectors at LEP, at the European Laboratory for Particle Physics, CERN, recorded their first electron-positron collisions at 200 gigaelectron volts (GeV). The image here shows the tracks of many charged particles produced in one of the first collisions at 200 GeV in the DELPHI detector. The tracks appear clustered in "jets", each jet indicating a common origin in a single fundamental particles - a quark - produced in the collision. Collisions at 200 GeV have also been seen in the other detectors at LEP. Check out the latest events from ALEPH, L3 and OPAL. You can also look here at live events from OPAL.
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