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). Two of the large magnets (blue) that guide the beams through the LHC are shown. The collision produced numerous hadrons (orange lines) and four muons (red lines) that were detected by the muon chambers (blue and green rectangles). It is thought the muons were the decay products of two Z boson particles.
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