Study of the local structure of interactions in the framework of quark-parton models

The presented paper studies the different methods by which evidence about the structure of elementary particles respectively the structure of currents for the description of interactions can be obtained. For this case some of the main derivations of sum rules and relations between structure functions are reproduced, and their conditions of validity are examined. The derived relations are combined with a mostly complete list of conditions which are necessary for their validity. An analysis of the experiments using the presented sum rules and relations shows that the parton picture in which th partons possess the quantum numbers of the quarks yields a useful description of the data. A more precise consideration of the conditions which are tested by the relations shows indeed that other charge assignments for partons, as they occur in Han-Nambu like models, are also able to describe the data. Furthermore it is shown by examples that in a series of cases instead of the color SU(3) postulated by quantum chromodynamics a color SO(3) also may yield a useful description of the present experimental data. (orig./HSI)