Page "Renormalization group" Paragraph 28

of the strong interactions, μ = Λ < sub > QCD </ sub > and occurs at about 200 MeV.

Conversely, the coupling becomes weak at very high energies ( asymptotic freedom ), and the quarks become observable as point-like particles, in deep inelastic scattering, as anticipated by Feynman-Bjorken scaling.

QCD was thereby established as the quantum field theory controlling the strong interactions of particles.