Colour Modification of Factorisation in Single-Spin Asymmetries

TL;DR

This paper explores how factorisation in hadronic single-spin asymmetries is affected by process-dependent colour factors and examines the QCD evolution of the twist-three gluonic-pole strength, providing insights into the underlying spin-dependent phenomena.

Contribution

It introduces a modified factorisation framework incorporating process-dependent colour factors and analyzes the QCD evolution of the twist-three gluonic-pole strength in the large-x limit.

Findings

Factorisation is partially maintained but modified by process-dependent colour factors.

QCD evolution of the twist-three gluonic-pole strength is examined in the large-x limit.

Insights into the evolution of the T-odd Sivers function and its relation to single-spin asymmetries.

Abstract

We discuss the way in which factorisation is partially maintained but nevertheless modified by process-dependent colour factors in hadronic single-spin asymmetries. We also examine QCD evolution of the twist-three gluonic-pole strength defining an effective T-odd Sivers function in the large-x limit, where evolution of the T-even transverse-spin DIS structure function g2 is known to be multiplicative.