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Proton collision

Proton collision

C014/1814

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Credit

ATLAS EXPERIMENT, CERN / SCIENCE PHOTO LIBRARY ATLAS 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 ATLAS (a toroidal LHC apparatus) detector at CERN (the European particle physics laboratory) near Geneva, Switzerland. The orange octagons are the endplates for the detector’s inner core. Before the collision the ions had been accelerated by the large hadron collider (LHC, grey line passing through the endplates). The collision produced numerous hadrons (orange lines) and a W boson. The W boson was not seen, but was revealed through its decay particles; a muon and a muon-neutrino. The single muon (red line) was detected by ATLAS’s muon chambers (blue rectangles). The muon-neutrino has a neutral charge and so cannot be detected, but its predicted trajectory (dotted red line) has been reconstructed in the end-on view of the detector at right.

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