Identifying the Universal part of TMDs

TL;DR

This paper explores a specific path layout for T-odd TMDs that maintains universality despite changing Wilson line orientations, by analyzing the structure of the quark correlator.

Contribution

It proposes a universal path layout for T-odd TMDs that incorporates features of initial- and final-state interactions, with a detailed calculation of the quark correlator structure.

Findings

Identifies a path layout that preserves TMD universality.

Calculates the generic structure of the quark correlator for this layout.

Provides theoretical insights into TMDs with mixed interaction features.

Abstract

We attempt to identify a path layout in the definition of transverse-momentum-dependent T-odd parton distribution functions (TMD)s which combines features of both, initial- and final-state interactions, so that it remains universal despite the fact that the Wilson lines entering such TMDs change their orientation. The generic structure of the quark correlator for this path layout is calculated.