Top Quark Presentation (IMAGE) DOE/Fermi National Accelerator Laboratory Caption Matteo Cremonesi, left, of the University of Oxford and the CDF collaboration, and Reinhard Schwienhorst of Michigan State University and the DZero collaboration present the joint discovery at a forum at Fermilab on Friday, Feb. 21. The two collaborations have observed the production of single top quarks in the s-channel, as seen in data collected from the Tevatron. 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.