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Event Display
In order to visualise what is produced when two particle beams collide, event displays are used to show pictorially the paths that the particles produced in a particular collision take inside of the detector. Event displays help us to understand what particle interactions and decays are actually taking place within the detector.
Event displays usually show data from both the tracking detector (the paths that the particles took) and the calorimeters (where the particles hit the wall of the detector). It is a very valuable tool for physicists trying to understand particle interations as the vast ammounts of data produced by the detectors can be very difficult to interpret without any form of graphical representation.

Here is a two dimensional event display produced specifically for the Zeus detector, with the detector components - notably the calorimeters (red) - apparent. The coliding beams enter from either side and collide in the centre. The produced tracks are shown in green and the calorimeter hits in yellow.

The event displayed here is a very good example of jet photoprodution, resulting in two high transverse energy jets