Four-jet event at DESY

Four-jet event at DESY

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Caption: Electronic display of a four-jet event in the Mark-J detector at the DESY particle physics laboratory, Hamburg. An electron & positron have collided in the detector and annihilated into pure energy which rematerialises in the form of a quark, an antiquark and two gluons radiated by the quarks. These particles are not visible because they immediately decay into four jets of other particles whose tracks are represented by the white dots. Events like this are the closest particle physicists have come to "seeing" gluons, the mediators of the strong nuclear force which holds together quarks & particles made of quarks such as protons & neutrons. (Event 14716) (May '84)

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Keywords: computer screen, desy, electron-positron collision, electronic display, four-jet event, gluon, hadron, jets, laboratory, mark-j detector, of particles, particle physics, particle physics research, quark

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