ATLAS EXPERIMENT, CERN / SCIENCE PHOTO LIBRARY ATLAS EXPERIMENT, CERN / SCIENCE PHOTO LIBRARY
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Cut-away view of the ATLAS (a toroidal LHC apparatus) detector at CERN (the European particle physics laboratory) near Geneva, Switzerland, showing particle tracks from a proton-proton collision. Before the collision the ions had been accelerated by the large hadron collider (LHC). The collision produced numerous hadrons (orange lines) and a W boson. The W boson was not seen, but was revealed through its decay particles; a muon (red line) and a muon-neutrino. The muon-neutrino has a neutral charge and so cannot be detected. The dark green rectangles are muon chambers.
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