Twist-3 single-spin asymmetries in semi-inclusive deep-inelastic scattering

被引：0
|
作者：
A. Metz
M. Schlegel
机构：
[1] Ruhr-Universität Bochum,Institut für Theoretische Physik II
来源：
The European Physical Journal A - Hadrons and Nuclei | 2004年 / 22卷
关键词：
13.60.Hb Total and inclusive cross-sections (including deep-inelastic processes); 13.88.+e Polarization in interactions and scattering;
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摘要：
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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页码：489 / 494
页数：5
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