Large Electron–Positron Collider

The Large Electron-Positron Collider (LEP) was a particle accelerator located at CERN, the European Organization for Nuclear Research, near Geneva, Switzerland. It operated from 1989 to 2000 and was one of the largest and most powerful colliders of its time. LEP was a circular collider that accelerated and collided electrons and their antiparticles, positrons, at high energies.