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ATLAS Experiment CERN
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The Z Particle

The massive Z particle, having a mass close to hundred proton masses, is produced when a quark and an antiquark annihilate and will instantly decay into a quark and an antiquark or a lepton and an antilepton.

      • The colliding high energy quark exists in the proton, but the antiquark has to be produced by one of the gluons in the proton converting to an antiquark and a quark. The quark-antiquark annihilation is the most likely reaction to produce a Z particle.