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Quantum Chromodynamics (QCD) is the physical theory describing
one of the fundamental forces, the strong interaction. It was first proposed in the early 1970s by David Politzer and by Frank
Wilczek and David Gross who also realized that QCD had a very important
feature called asymptotic freedom. It uses quantum field theory to describe the interaction of quarks and gluons.
According to this theory, there is an SU(3) gauge group and that the quarks are
SU(3) triplet Dirac fermion fields. QCD is a non-perturbative theory
due to effects like confinement, fermion condensates and instantons.
Most theoretical work on QCD is done with lattice models.
See also
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