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BESIII confirms evidence of glueball particle X(2370)

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2026-08-19 00:41 UTC → 2026-09-04 12:04 UTC · added ~~removed~~

Researchers from the Beijing Spectrometer III (BESIII) collaboration, part of the Institute of High Energy Physics under the Chinese Academy of Sciences, have announced findings providing the first definitive experimental evidence of a glueball. By analyzing more than ten billion decays of the J/ψ particle at the Beijing Electron-Positron Collider II, the team identified the X(2370) particle. The findings, presented at the International Conference on High Energy Physics (ICHEP) in Brazil, indicate that the particle’s mass, quantum numbers, and flavor-singlet nature align with theoretical predictions for a pseudoscalar glueball. This discovery, achieved after 15 to 17 years of ~~work,~~ data collection, marks the most compelling evidence for glueballs in half a century of searches and validates long-standing predictions of quantum ~~chromodynamics.~~ chromodynamics (QCD). The identification provides a fundamental verification of the non-Abelian gauge structure of QCD at low energies. While the ~~results, which appeared in an arXiv preprint,~~ results suggest the X(2370) is a composite particle made entirely of gluons, researchers intend to conduct further decay measurements. These future studies aim to determine the extent of any mixing between the glueball and ordinary quark matter. In a related development, the BESIII collaboration also utilized quantum entanglement with antimatter to perform a decay measurement of the lambda hyperon, yielding results that align with conventional theoretical predictions but stand in tension with previous measurements.

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