Two-jet event at the PETRA collider

Two-jet event at the PETRA collider

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Caption: Computer display of a two-jet event in the Mark-J detector at the PETRA collider at DESY, the part- icle physics laboratory in Hamburg. An electron & positron have collided & annihilated into pure energy which rematerialises in the form of a quark & an antiquark. These live too briefly to be visible, but are recognised when they immediately decay into two oppositely directed jets of other particles. The display shows a cross-section of the Mark-J detector, with the beam pipe where the original collision occured marked by the white cross at centre. Around it are drift tubes & shower counters (blue), drift chambers (green), lead glass detectors (blue), & the magnet (black). (Event 3904) (May '84).

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

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