e+e- -> Z -> mu+ + mu- + photon
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As in the previous event, the Z particle decays into a muon-antimuon pair. However, in this case a photon is also produced. Being uncharged the photon leaves no track in the central part of the detector, but is detected in the electromagnetic calorimeter where it deposits its energy, as represented by the green block.

Particle Physics Education CD-ROM 1999 CERN