Chinese physicists present strong evidence that X(2370) is a gluon-only glueball
Scientists from the BESIII Collaboration say the particle X(2370) exhibits characteristics of a glueball, a bound state made solely of gluons.
Researchers from the Beijing Spectrometer III (BESIII) Collaboration announced at the International Conference on High Energy Physics in Natal, Brazil that the particle X(2370) shows strong signatures of being a glueball, a cluster made entirely of gluons. Their analysis of nearly ten billion J/ψ decays and the determination of X(2370)’s spin-parity as 0-+ align with theoretical expectations for the lightest glueball. Although some physicists caution that the evidence is not yet conclusive, the accumulated data make the case quite persuasive.
Confirmation of glueballs would validate the self-interaction of gluons predicted by quantum chromodynamics and could improve understanding of the origin of mass, since gluon dynamics contribute to the bulk of proton mass. The BESIII experiment, running at the Beijing Electron-Positron Collider II, is uniquely positioned to generate the large numbers of J/ψ particles needed for such investigations.
Why it matters
Proving glueballs exist would confirm a key theory about gluon self-interaction and deepen our grasp of how mass is generated in matter.
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