X(2370) particle provides strongest evidence for glueball

Physicists from the BESIII Collaboration have announced findings that provide the strongest evidence to date for the existence of a glueball, an exotic subatomic state composed primarily of gluons rather than quarks. The research centers on the X(2370) particle, which matches theoretical predictions for a pseudoscalar glueball regarding its mass, quantum properties, and decay behavior.

For nearly 50 years, scientists have searched for such a particle, which is predicted by quantum chromodynamics (QCD)—the theory describing the strong interaction. Unlike photons, gluons can interact with one another, allowing for the theoretical possibility of a bound state made of force carriers alone.

The findings were presented on August 5 at the International Conference on High Energy Physics in Brazil. The data was gathered using the Beijing Electron Positron Collider II at China’s Institute of High Energy Physics. While the evidence is considered highly comprehensive, researchers intend to conduct further decay measurements to determine the extent of any mixing between the glueball and ordinary quark matter.