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 Z boson. The Z boson is not seen, but is revealed through its decay products; a pair of muons (red lines), which were detected by the muon chambers (blue and green rectangles).
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