On the Relation Between Mechanisms for Single-Transverse-Spin Asymmetries
Abstract
Recent studies have shown that two widely-used mechanisms for single-transverse-spin asymmetries based on either twist-three contributions or on transverse-momentum-dependent (Sivers) parton distributions become identical in a kinematical regime of overlap. This was demonstrated for the so-called soft-gluon-pole and hard-pole contributions to the asymmetry associated with a particular quark-gluon correlation function in the nucleon. In this paper, using semi-inclusive deep inelastic scattering as an example, we extend the study to the contributions by soft-fermion poles and by another independent twist-three correlation function. We find that these additional terms organize themselves in such a way as to maintain the mutual consistency of the two mechanisms for single-spin asymmetries.
Keywords
Cite
@article{arxiv.0711.0636,
title = {On the Relation Between Mechanisms for Single-Transverse-Spin Asymmetries},
author = {Yuji Koike and Werner Vogelsang and Feng Yuan},
journal= {arXiv preprint arXiv:0711.0636},
year = {2008}
}
Comments
References added, version to appear in Phys. Lett. B