Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 65, Issue 1-2, Pages 137-151Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-009-1178-9
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Hard exclusive pi (+) electroproduction is investigated within the handbag approach. The prominent role of the pion-pole contribution is demonstrated. It is also shown that the experimental data require a twist-3 effect which ensues from the helicity-flip generalized parton distribution H (T) and the twist-3 pion wave function. The results calculated from this handbag approach are compared in detail with the experimental data on cross sections and spin asymmetries measured with a polarized target. It is also commented on consequences of this approach for exclusive pi (0) and vector-meson electroproduction.
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