Tetraquarks, illustration
Illustration of two tetraquarks, whose discovery by the Large Hadron Collider beauty (LHCb) experiment at CERN, the European particle physics laboratory, was announced in July 2022. The tetraquark on the left is made of a charm quark, a strange antiquark and an up quark and a down antiquark. The tetraquark on the right is made of a charm quark, a strange antiquark and an up antiquark and down quark., by Daniel Dominguez/CERN/SCIENCE PHOTO LIBRARY
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