CERN Discovers Ξcc⁺ — A New Proton-Like Particle With Two Charm Quarks That Solves a 20-Year Physics Mystery
Scientists at CERN’s Large Hadron Collider have discovered the Ξcc⁺ (Xi-cc-plus), a new subatomic particle containing two charm quarks and one down quark. The discovery, announced in April 2026, is the first made using the upgraded LHCb detector and solves a 20-year theoretical puzzle.
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