Abstract
We discuss the interpretation of the nucleon's polarized structure function ${\mathit{g}}_{2}$(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 ${\mathit{g}}_{2}$(x) are related to overlap integrals between wave functions of opposite longitudinal polarizations. In the light-cone formalism such wave functions are related by the kinematical operator scrY, or light-cone parity. As a consequence, it can be shown that moments of ${\mathit{g}}_{2}$ give information about the same parton wave function, or probability amplitude to find a certain parton configuration in the target which defines ${\mathit{g}}_{1}$(x) or ${\mathit{F}}_{2}$(x). Specific formulas are given, and possible applications to the phenomenology of the nucleon structure in QCD are discussed.
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