"Four Fermion" Events

Remember the example diagram we used to represent qqg 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


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

(home) Back to Home Page with table of contents.

Terry Wyatt. March 1997.