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. Shaded areas are elements of the detector. Before the collision the ions had been accelerated to 7 TeV (tera electron volts) by the large hadron collider (LHC). The collision produced a W boson, which quickly decayed in to a tau lepton and a neutrino. Neither the W boson nor the tau lepton were seen, but were revealed through the decay products of the tau lepton; hadron particles (yellow lines) and a neutrino (not seen).
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