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Physicists from CERN’s LHCb Collaboration have discovered a new tetraquark particle, named X(6900), composed of two charm quarks and two charm antiquarks.
Quarks fuse to release energy
Possibility of strange new particle surprises physicists
Impossible' Particle Discovery Adds Key Piece to the Strong Force Puzzle
Three cousins join family of four-quark particles
CERN's new particle Xi-cc++ opens up physics mystery - ABC News
Higgs boson - Wikipedia
Inside the Large Hadron Collider, the Machine at the Heart of All Matter
ATLAS observes potential four-charm tetraquark
CERN Physicists Directly Observe Fundamental Phenomenon in Quantum Chromodynamics
CERN Physicists Find a Particle With a Double Dose of Charm - The New York Times