 Large Electron–Positron Collider

A CERN electron–positron collider. Its higher-energy operation made W-pair production available for measurements of electroweak triple gauge couplings.

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.