QCD Aspects of Hadron Physics

Abstract

Several topics in hadron physics at different scales of resolution are discussed. First, deep-inelastic scattering from nucleons and nuclei is viewed in a light-cone coordinate space picture. Then the smooth transition from parton to hadron degrees of freedom is demonstrated by using a generalized Q^2-dependent polarizabilities of the nucleon. Turning to low energy QCD we summarize recent developments related to the role of strange quarks in Chiral SU(3) Dynamics, a non-perturbative coupled channel approach to hadronic processes. Finally we elaborate on a unification of QCD Sum Rules with aspects of spontaneous chiral symmetry breaking in the analysis of quark-antiquark excitations of the condensed QCD vacuum and in nuclear matter.

Comments: 12 pages, 6 figures. Dedicated to Koichi Yazaki on the occasion of his 60th birthday; invited talk presented at the KEK-Tanashi Symposium on Physics of Hadrons and Nuclei, Tokyo, December 14-17, 1998