Drell-Yan Alpha (IMAGE) DOE/Argonne National Laboratory Caption Graphic of quarks annihilating (left red lines), producing a photon (middle line), and producing two muons (right magenta lines). Scientists detected these muons to gain insight into the quark asymmetry of the proton. Credit (Image by Paul Reimer/Argonne National Laboratory.) 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.