News CERN discovers a new ‘exotic’ tetraquark Researchers at the world’s biggest atom smasher announced they have observed a type of four-quark particle that physicists have never seen before. By Arete News - July 1, 2020 Illustration of a new tetraquark detected for the first time at CERN (AN/CERN) You need to login to view this content. Please Login. Not a Member? Join Us