Parton distributions: Functional complexity and Lorentz parametrization

TL;DR

This paper investigates the functional complexity of Lorentz parametrizing functions in parton distributions, highlighting how interactions and time-reversal transformations introduce additional complexities and proposing new parametrizing functions.

Contribution

It introduces the concept that interactions in correlators add sources of complexity and presents evidence for new Lorentz parametrizing functions in parton distributions.

Findings

Interactions generate additional sources of functional complexity.

Evidence for the existence of new parametrizing functions.

Revised Lorentz parametrization of correlators.

Abstract

In the 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 non-local 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 non-local operators. The evidences for the new parametrizing function existence have been presented.