Lead ion collision

Lead ion collision

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Caption: Particle tracks from a lead ion collision seen by the CMS (compact muon solenoid) 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 central tracking chamber (cylindrical) and muon chambers (red rectangles) of the detector are seen end-on in outline. The collision produced a number of unidentified particles (orange) and an upsilon meson. The upsilon meson is not seen, but is revealed through its decay products; a pair of muons (two longest red lines). The green lines show the energy deposited by the muons in the detector's muon chambers. The energies of the unidentified particles are measured by the electrochemical calorimeter (shorter red lines) and the hadron calorimeter (blue).

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Keywords: apparatus, cern, cms, collision, compact muon solenoid, cosmological, cosmology, decay products, electromagnetic calorimeter, energy, european particle physics laboratory, experiment, fundamental particles, geneva, hadron calorimeter, hadrons, large hadron collider, lead ion collision, lhc, matter, muon, muon chamber, particle accelerator, particle detector, particle physics, particle track, physical, physics, research, structure of matter, subatomic particles, switzerland, trace, traces, tracks, trajectories, trajectory, upsilon meson

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