ALICE Collaboration

New Capabilities

As of September 2026: Conducted the experiment and analysis under review

Physicists at CERN have found a new way to peer inside atomic nuclei, zooming in on structures about one-quarter the size of a proton. Using the ALICE experiment at the Large Hadron Collider, they measured production of a particle called J/ψ (pronounced "JAY-sigh") at unprecedentedly fine resolutions—and saw something that challenges a decades-old explanation.

Updated Sep 13