Parton interpretation of the nucleon transverse spin dependent structure function

We discuss the interpretation of the nucleon's polarized structure function g2(x). If the target state is represented by its Fock decomposition on the light-cone, the Operator Product Expansion allows us to demonstrate that moments of g2(x) are related to overlap integrals between wave functions of opposite longitudinal polarizations. In the light-cone formalism such wave functions are related by kinematical operator Y, or light-cone parity. As a consequence, it can be shown that moments of g2 give information about the same parton wave function, or probability amplitude to find a certain parton configuration within the target, which defines g1(x) or F2(x). (orig.)