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Particle physics

Three’s the charm

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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Fig. 1: Different possible measurements on partons in the proton.


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Correspondence to Jonathan Gaunt.

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Gaunt, J. Three’s the charm. Nat. Phys. 19, 305–306 (2023).

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