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Particles and interactions

Particles and interactions

Proton contains more anti-down quarks than anti-up

16 Mar 2021
Quark and gluon sea in the proton
Quark and gluon sea: in this illustration of the proton the large spheres represent the three valence quarks, the small spheres other quarks and the springs the gluons holding them together. (Courtesy: Brookhaven National Laboratory.)
The sea of short-lived particles in the proton has a far higher abundance of anti-down quarks than a

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Sam Jarman is a science writer based in the UK
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