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arXiv · hep-ph/0610112

Transverse single spin asymmetries in inclusive deep-inelastic scattering

A. Metz·M. Schlegel·K. Goeke
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Abstract

In inclusive deep-inelastic lepton-hadron scattering multi-photon exchange between the leptonic and the hadronic part of the process causes single spin asymmetries. The asymmetries exist for a polarized target as well as a polarized incoming or outgoing lepton, if the polarization vector has a component transverse with respect to the reaction plane. The spin dependent parts of the single polarized cross sections are suppressed like $α_{em} m_{pol}/Q$ - where $m_{pol}$ denotes the mass of the polarized particle - compared to the leading terms of the cross section for unpolarized or double-polarized deep-inelastic scattering. Both the target and the beam spin asymmetry are evaluated in the parton model. In the calculation only quark-quark correlators are included. While this approximation turns out to be justified for the lepton spin asymmetries, it is not sufficient for the target asymmetry.

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A. Metz, M. Schlegel, K. Goeke. 2006-11-14. Transverse single spin asymmetries in inclusive deep-inelastic scattering. https://doi.org/10.1016/j.physletb.2006.11.009

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