Physicists discover a hidden gluon structure inside protons that could rewrite textbooks
Physicists using the STAR detector have found evidence that the baryon number in protons may be carried by a 'gluon junction' rather than just the valence quarks. This discovery challenges long-standing models of subatomic particle structure.
Why it matters
This finding could fundamentally rewrite textbooks on nuclear physics and our understanding of the building blocks of matter.
New findings from the STAR detector at the Relativistic Heavy Ion Collider (RHIC) are challenging a familiar picture of what gives protons one of their defining quantum properties. The results suggest that gluons, the particles that act as the glue holding quarks together, may play a key role in carrying and conserving baryon number.
The evidence comes from high-energy particle collisions at RHIC, a U.S. Department of Energy (DOE) Office of Science user facility for nuclear physics research that operated at DOE's Brookhaven National Laboratory from 2000 to early 2026. According to the new study, published in Science , baryon number may be associated with a Y-shaped "junction" of gluons connecting the proton's three main quarks. If confirmed, that would challenge the long-standing assumption that baryon number belongs exclusively to those quarks.
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