Most particle physicists now believe that protons, neutrons, and other strongly interacting particles are built from more basic constituents known as “quarks” and “gluons,” which interact according to the rules of a relativistic quantum field theory known as “quantum chromodynamics.”
Quarks, atoms, and the 1/N expansion
Edward Witten; Quarks, atoms, and the 1/N expansion. Physics Today 1 July 1980; 33 (7): 38–43. https://doi.org/10.1063/1.2914163
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