How to Identify Events Containing a Particle-Antiparticle Pair (Z0 decays)

Perhaps the simplest types of events to identify are those in which the electron and positron annihilate to produce a Z0 that then decays to produce a particle-antiparticle pair. The particle and antiparticle then fly off back to back and are observed in the detector. We represent the production of, for example, a muon-antimuon pair in Z0 decay by means of the following diagram:

Here are some events containing the different types of particle-antiparticle pairs, with hints on how to identify them:

Once you've understood the way we identify the different types of events, then proceed to:
(challenge) Challenge II

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