LHCB EXPERIMENT, CERN / SCIENCE PHOTO LIBRARY LHCB EXPERIMENT, CERN / SCIENCE PHOTO LIBRARY
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Particle tracks from a proton-proton collision seen by the LHCb (large hadron collider beauty) 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 (seen at far left) produced a strange bottom meson, which consists of a bottom antiquark bound with a strange quark. The particle was not seen, but is revealed through its decay products; a pair of muons (purple lines).
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