Proton Lead Collision (IMAGE) Vanderbilt University Caption This is a aiagram of a proton-lead collision in the Large Hadron Collider that produced a drop of quark-gluon plasma about one-tenth the size of those produced in previous experiments. Credit Large Hadron Collider/CMS 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.