The keepers at Particle Zoo should ready a new enclosure. Particle hunters are claiming a sighting of a beast of legend – the tetraquark. A jumbo particle made up of four quarks, it is a hitherto undiscovered form of matter.
Tetraquarks were first posited to exist over 30 years ago, as solutions to the equations of quantum chromodynamics. QCD is a theory developed to describe how quarks combine to make two-quark mesons, such as pions and kaons, and three-quark baryons like protons or neutrons.
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