Example Events

Events in which an electron-positron pair are produced are fairly easy to identify. We see a back-to-back pair of high momentum tracks pointing at high energy clusters of energy in the electromagnetic calorimeter.

Here are a couple of example events.

Example Event Number 1

End-On View of Event

The incoming beams of electrons and positrons travel in opposite directions along the axis of the cylindrical detector. (In this picture this corresponds to a line that is perpendicular to your computer screen and through the centre of the concentric circles.)

Side View of Event

Example Event Number 2

In the second example event the electrons strike the end-cap region of the detector.

End-On View of Event

Side View of Event

Next take a look at some example events.

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