What is a glueball?
Scientists have potentially the first evidence for a form of matter made just from the carriers of a fundamental force
Glueballs are hypothetical composite particles that are formed in the realm of quantum chromodynamics (QCD). QCD is the theory that describes the strong force, one of the four fundamental forces in nature. The other forces are gravity, the weak force, and electromagnetism. In QCD, the strong force is carried by particles called gluons, similar to how electromagnetism is carried by photons.
However, unlike photons, gluons possess a type of charge that allows them to attract each other. According to QCD, these gluons can aggregate to create glueballs, which are composite particles.
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