CDF Single Top Quark Candidate Event (IMAGE) DOE/Fermi National Accelerator Laboratory Caption This collision event display, created by the CDF collaboration, shows a single top quark candidate event. The red arrow indicates the direction of a neutrino and the purple line the direction of an electron escaping from the decay of the top quark. Credit CDF collaboration 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.