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Electron-positron collision

Electron-positron collision

C014/7667

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Credit

CERN / SCIENCE PHOTO LIBRARY 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 an electron-positron collision seen by the L3 detector at CERN (the European particle physics laboratory) near Geneva, Switzerland. L3 was built around the large electron positron (LEP) accelerator ring, which ran from 1989-2000. Elements of the detector are outlined in red. The collision produced a J/psi meson. This particle is not seen, but is revealed through its decay products; a muon (blue line) and antimuon (green line). J/psi consists of a charm quark bound with a charm antiquark.

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