Physicists find strongest-ever evidence for the glueball — a particle made of pure force

A team working at the BESIII particle accelerator in Beijing has announced the strongest evidence yet for the existence of the glueball, a state of matter predicted in the 1970s. The particle, labelled X(2370), contains no quarks — its mass comes entirely from the binding energy of gluons, the carriers of the strong nuclear force. The discovery is considered a major milestone for both theoretical and experimental physics.

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