Chromodynamic Lensing and Single Spin Asymmetries
Matthias Burkardt
Abstract
The physical interpretation of generalized parton distributions (in the limit ξ=0) as Fourier transforms of impact parameter dependent parton distributions is discussed. Particular emphasis is put on the role of the target polarization. For transversely polarized targets we expect a significant deviation from axial symmetry for the distribution in the transverse plane. We conjecture that this transverse distortion, in combination with the final state provides a natural explanation for the sign of the Sivers contribution to semi-inclusive single-spin asymmetries.
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