Twist-3 Single-Spin Asymmetries in Semi-Inclusive Deep-Inelastic Scattering

Details Twist-3 Single-Spin Asymmetries in Semi-Inclusive Deep-Inelastic Scattering Twist-3 Single-Spin Asymmetries in Semi-Inclusive Deep-Inelastic Scattering

2004-03-16

arxiv.org/abs/hep-ph/0403182v2

Eur.Phys.J. A22 (2004) 489-494

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 2 figures, minor changes, version to appear in EPJA

Scientific paper

10.1140/epja/i2004-10050-8

The single spin asymmetries for a longitudinally polarized lepton beam or a longitudinally polarized nucleon target in semi-inclusive deep-inelastic scattering are twist-3 observables. We study these asymmetries in a simple diquark spectator model of the nucleon. Analogous to the case of transverse target polarization, non-vanishing asymmetries are generated by gluon exchange between the struck quark and the target system. It is pointed out that the coupling of the virtual photon to the diquark is needed in order to preserve electromagnetic gauge invariance at the twist-3 level. The calculation indicates that previous analyses of these observables are incomplete.

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