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:
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
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