In proton–proton collisions, the CMS Collaboration measures the simultaneous production of three particles, each consisting of a charm quark and a charm antiquark, which yields insights into how the proton’s constituents interact.
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The author declares no competing interests.
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Gaunt, J. Three’s the charm. Nat. Phys. 19, 305–306 (2023). https://doi.org/10.1038/s41567-022-01850-2