Production of the Y Particle (IMAGE) DOE/Fermi National Accelerator Laboratory Caption The Tevatron typically produces about 10 million proton-antiproton collisions per second, sometimes creating particles known as B mesons. The CDF scientists found evidence that some B mesons unexpectedly decay into an intermediate quark structure identified as a Y particle. 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.