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arXiv · 0711.0636

On the Relation Between Mechanisms for Single-Transverse-Spin Asymmetries

Yuji Koike·Werner Vogelsang·Feng Yuan
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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.

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Yuji Koike, Werner Vogelsang, Feng Yuan. 2008-01-14. On the Relation Between Mechanisms for Single-Transverse-Spin Asymmetries. https://doi.org/10.1016/j.physletb.2007.11.096

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