Time reversal-odd effects in QCD and beyond

TL;DR

This paper explores the process dependence of time-reversal-odd phenomena in QCD, like the Sivers effect, by comparing phenomenological and symmetry-based approaches, and investigates potential generalizations to other gauge theories.

Contribution

It establishes a framework linking phenomenological and symmetry-based descriptions of T-odd effects in QCD and explores their generalization beyond QCD.

Findings

Identifies key elements causing process dependence in T-odd effects

Provides a symmetry-based perspective on phenomenological observations

Suggests possible extensions to other gauge theories

Abstract

In this paper we will describe a parallel between phenomenological and symmetry-based descriptions of the process dependence of the time-reversal-odd phenomena in QCD, such as the Sivers effect, with the goal of defining the essential elements that lead to such process dependence in QCD. This will then serve as a starting point to explore possible generalizations in a different gauge theory.