ATLAS EXPERIMENT, CERN / SCIENCE PHOTO LIBRARY ATLAS EXPERIMENT, CERN / SCIENCE PHOTO LIBRARY
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Particle tracks from a proton-proton collision seen by the ATLAS (a toroidal LHC apparatus) detector at CERN (the European particle physics laboratory) near Geneva, Switzerland. The orange octagons are the endplates for the detectorâs inner core. Before the collision the ions had been accelerated by the large hadron collider (LHC, grey line passing through the endplates). 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 and a muon-neutrino. The single muon (red line) was detected by ATLASâs muon chambers (blue rectangles). The muon-neutrino has a neutral charge and so cannot be detected, but its predicted trajectory (dotted red line) has been reconstructed in the end-on view of the detector at right.
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