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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. 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 (dotted red line). The muon-neutrino has a neutral charge and so cannot be detected, but its predicted trajectory has been shown.
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