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Transverse single spin asymmetries in inclusive deep-inelastic scattering
Metz, A Schlegel, M Goeke, K
Metz, A
Schlegel, M
Goeke, K
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Journal Article
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2006-12-28
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10.1016/j.physletb.2006.11.009
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 αem mpol / Q-where mpol 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. © 2006 Elsevier B.V. All rights reserved.
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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