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

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

2007-11-05

arxiv.org/abs/0711.0636v2

Phys.Lett.B659:878-884,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

References added, version to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2007.11.096

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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