Remember the example diagram we used to represent events:

Instead of flying out and being observed in the calorimeter, sometimes the photon produces an additional particle-antiparticle pair. Such events contain two particle-antiparticle pairs. For example:

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These events go by the jargon name "four fermion" events. Here is an example event that contains electron-positron and muon-antimuon pairs:

Example Four Fermion Event

End-On View of Event

Side View of Event

Back to general section on "How to Identify Some Slightly More Complicated Types of Event".

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