LHCb discovers a new type of tetraquark

For the first time, the LHCb collaboration at CERN has observed an exotic particle made up of four charm quarks. The LHCb collaboration has observed a type of four-quark particle that has never been seen before. The discovery, presented at a recent seminar at CERN and described in a paper posted today on the arXiv preprint server, is likely to be the first of a previously undiscovered class of particles. Quarks typically combine together in groups of twos and threes to form particles called hadr...