Proton collision

Proton collision

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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 detector is seen end-on here, with various elements shaded. The blue rectangles are the muon chambers. Before the collision the ions had been accelerated to 7 TeV (tera electron volts) by the large hadron collider (LHC). The collision produced a J/psi meson. The particle was not seen, but is revealed through its decay products; a pair of muons (yellow lines) and a photon (yellow and green blocks between the muon lines).

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Keywords: a toroidal lhc apparatus, antimuon, atlas, black background, cern, charm antiquark, charm quark, charm-anticharm quark pair, charmonium, collision, cosmological, cosmology, decay products, european particle physics laboratory, experiment, fundamental particles, geneva, high energy, j psi, j/psi, jpsi, large hadron collider, lhc, matter, meson, muon, particle accelerator, particle detector, particle physics, particle track, physical, physics, proton proton collision, proton-proton, switzerland

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