The European Organization for Nuclear Research, which is situated close to Geneva in Switzerland and is supported by a number of European nations. It was founded in 1954 and has run the Super Proton Synchrotron (SPS), with a 7-km underground tunnel enabling protons to be accelerated to 400 GeV, the Large Electron–Positron Collider (LEP), in which 50 GeV electron and positron beams are collided and, since 2008, the Large Hadron Collider (LHC), the world’s largest accelerator, which allows 7 TeV proton beams to collide. Among the important discoveries made at CERN have been the W boson, the Z boson, and the Higgs boson.
https://home.cern/ The CERN public website