Abstract
Quantum Chromodynamics is a renormalizable non-Abelian gauge field theory of quarks and gluons, based on the principle of exact local SU(3)-color symmetry.1 From the experimental standpoint, there is now impressive evidence2 that QCD is a viable theory of hadronic phenomena. The most important phenomenological evidence for QCD comes from inelastic lepton scattering, e+e− annihilation processes, and those high momentum transfer exclusive and inclusive reactions where the structure of perturbative quark and gluon sub-processes can be studied in relative isolation from the bound state dyniamics of the hadrons. From the theoretical standpoint, the elegant structure of QCD makes it appear almost compelling as a fundamental theory of hadronic phenomena, even though many crucial questions concerning quark and gluon confinement, and the effects of non-perturbative phenomena remain unanswered.3 KeywordsForm FactorDistribution AmplitudeHigh TwistPion Form FactorLarge Momentum TransferThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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