Perturbative QCD
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Perturbative QCD is the study of the theory of Quantum chromodynamics in energy regimes where the strong coupling constant αs is small, allowing Perturbation theory to be applied. In most circumstances, actually computing the predictions of QCD is extremely difficult, due to the infinite number of topologically inequivalent interactions possible. At high energy, the coupling is small enough that this infinite number of terms can be approximated accurately by a much more manageable number of terms. Although limited in scope, this approach has resulted in the most precise tests of QCD to date.
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