The difficulties in isolating specific QCD mechanisms which control hadronic phenomena, and the complications in obtaining quantitative tests of QCD are discussed. A number of novel QCD effects are reviewed, including heavy quark and higher twist phenomena, initial and final state interactions, direct processesI multiparticle collisions, color filtering, and nuclear target effects. The importan...

We review applications of Yangain symmetry to high-energy QCD phenomenology. Some basic facts about are recalled, in particular the spinor-helicity form scattering amplitudes, scale evolution equations deep-inelastic structure functions and asymptotics scattering. As working tool Yangian symmetric correlators introduced constructed framework algebra $g\ell(n)$ type. present application tree amp...

ACKNOWLEDGEMENT Before beginning, I wish to acknowledge the invaluable and generous help of Marvin Weinstein in introducing me to much of the material covered in these lectures. While there are many shortcomings of these n0tF.s , they are not to be blamed on him; they would have been much poorer without his help and insights. .

Errors pertaining to the following physical theories are discussed: the Dirac magnetic monopole theory; the KleinGordon equation; the Yukawa theory of nuclear force; the idea of Vector Meson Dominance; the Aharonov-Bohm effects; the idea of diffraction-free electromagnetic beams and Quantum Chromodynamics. Implications of the theoretical errors are discussed briefly. In particular, relations be...

The subject of this talk was the review of our study of three (2 + 1) dimensional Quantum Chromodynamics. In our previous works, we showed the existence of a phase where parity is unbroken and the flavor group U (2n) is broken to a subgroup U (n) × U (n). We derived the low energy effective action for the theory and showed that it has solitonic excitations with Fermi statistic, to be identified...

Light-front quantum chromodynamics may lead to an accurate constituent approximation for the low-energy properties of hadrons. This requires a cutoff that violates explicit gauge invariance and Lorentz covariance, leading to the calculation of a renormalized QCD hamiltonian using a similarity renormalization group. Renormalization repairs broken symmetries, and in light-front field theory it mo...