Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-09-23
Fizika B13 (2004) 565-576
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, invited talk given at workshop on `light-cone 2003: Hadrons and Beyond' (Durham, August 2003) and at `NAPP 2003' (Dub
Scientific paper
The physical interpretation of generalized parton distributions (in the limit $\xi=0$) 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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