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Proton collision

Proton collision

C014/1794

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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 proton-proton 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 to 7 TeV (tera electron volts) by the large hadron collider (LHC). The collision (yellow dot) produced a xi-zero-b-star particle. The particle was not seen, but was revealed by its decay products. The xi-zero-b-star particle decayed into a pion (blue line) and a xi-b particle, which in turn decayed into a xi-minus particle and J/psi particle. None of these three particles lasted long enough to be seen, but their decay products were detected. The J/psi decayed into a pair of muons (red lines). The xi-minus decayed into a pion (pink line) and a lambda baryon (yellow dotted line), which then decayed into a proton and a pion (purple lines).

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