Belle II Detector (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Electrons and positrons collide within the Belle II detector. Credit ill./©: Belle II Usage Restrictions This image may only be used in connection with the press release "Belle II yields first results in search of the Z' boson", issued by Johannes Gutenberg University Mainz on April 8, 2020. 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.