The Kaon (IMAGE) American Physical Society Caption Preliminary reports of an extremely rare decay of a subatomic particle called the kaon could challenge the standard model of particle physics Credit Kitahara et al., Physical Review Letters (2020) 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.