Parton distributions: Functional complexity and Lorentz parametrization

Abstract

In this paper, we focus on the study of the functional complexity of the Lorentz parametrizing functions in connection with the time-reversal transformations. We argue that the interactions encoded in the corresponding correlators of nonlocal quark(–gluon) operators generate additional sources of functional complexity for the parametrizing functions which are not discussed in the literature. We also revisit the Lorentz parametrization of different correlators given by the hadron matrix elements of the nonlocal operators. The evidences for the new parametrizing function existence have been presented.