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Within the context of the relativistic Fermi gas model, the concept of "y scaling" for inclusive electron scattering from nuclei is investigated.Specific kinematic shifts of the single-nucleon response in the nuclear medium can be incorporated with this model. Suggested generalizations beyond the strict Fermi gas model, including treatments of separated longitudinal and transverse responses, are also explored.

Motivated by the present interest in the heavy quark e ective theory, we use the spectator equation to treat the mesonic bound states of heavy quarks. The kernel we use is based on scalar con ning and vector Coulomb potentials. Wave functions are treated to leading order and energies to order 1=m Q in the heavy-light systems, and order 1=m 2 Q in heavy-heavy systems. Our results are in reasonable agreement with experimental measurements. We estimate two of the parameters of the heavy quark e ective theory, and propose further calculations that may be undertaken in the future. Motivated by the present interest in the heavy quark e ective theory, we use the spectator equation to treat the mesonic bound states of heavy quarks. The kernel we use is based on scalar con ning and vector Coulomb potentials. Wave functions are treated to leading order and energies to order 1=mQ in the heavy-light systems, and order 1=m 2 Q in heavy-heavy systems. Our results are in reasonable agreement with experimental measurements. We estimate two of the parameters of the heavy quark e ective theory, and propose further calculations that may be undertaken in the future.

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While quark-hadron duality is well established experimentally, the current theoretical understanding of this important phenomenon is quite limited. To expose the essential features of the dynamics behind duality, we use a simple model in which the hadronic spectrum consists of narrow resonances made of valence quarks. We qualitatively reproduce the features of duality as seen in electron scattering data within our model. We show that in order to observe duality, it is essential to use the appropriate scaling variable and scaling function. In addition to its great intrinsic interest in connecting the quark-gluon and hadronic pictures, an understanding of quark-hadron duality could lead to important benefits in extending the applicability of scaling into previously inaccessible regions.

We investigate the role of correlated πρ exchange in the extraction of matrix elements of the strange vector current in the proton. We show that a realistic isoscalar spectral function including this effect leads to sizeably reduced strange vector form factors based on the dispersion-theoretical analysis of the nucleons' electromagnetic form factors. DEDICATED TO THE MEMORY OF KARL HOLINDE#1 Present address: