Z -> jet jet A Z particle can decay to a quark and antiquark, and the quarks produce jets. Jets are sprays of particles and do not have as consistent a shower shape as do electrons and muons. The best way to look for jets is to look for concentrations of energy in the event. Towers with a lot of energy (the jet core) surrounded by many other towers with less energy indicates a jet while lots of towers with low energy indicates debris that is not from the Z decay. Watch this event rotate with an or .