ZZ Events (IMAGE) DOE/Fermi National Accelerator Laboratory Caption One of the three ZZ events recorded by the DZero experiment at Fermilab: each Z boson decayed into a pair of high-energy muons, yielding four muon tracks in the DZero detector. The green bars indicate the energy associated with each muon. Credit Fermilab Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.