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Lead ion collision

Lead ion collision

C014/1793

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Credit

CMS EXPERIMENT, CERN / SCIENCE PHOTO LIBRARY CMS EXPERIMENT, CERN / SCIENCE PHOTO LIBRARY

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Editorial use only. This image may not be used to state or imply endorsement by CERN of any product, activity or service.

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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Model release not required. Property release not required.

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