Exotic hadrons (IMAGE) Indiana University Caption An artist rendition of three exotic hadron candidates: a hybrid meson, a tetraquark, and a pentaquark. Credit Image by Vincent Mathieu, JPAC Usage Restrictions Credit source License Original 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.