Is that a tetraquarkwe see before us?

摘要

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.rnTetraquarks were first posited to exist over 30 years ago, as a solution to the equations of quantum chromodynamics, a theory to describe how quarks combine to make two-quark mesons and three-quark baryons. QCD allows for particles made of more quarks, but such exotic variants have remained undetected.