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Abstract: Generalized Parton Distributions describe, within QCD factorization, the nonperturbative component in the amplitudes for deeply virtual exclusiveprocesses. However, in order for a partonic interpretation to hold,semi-disconnected diagrams should not contribute. We show that this conditionis not satisfied for non-forward kinematics at leading order, and that gluonmediated re-interactions are essential for a consistent description in terms ofparton degrees of freedom.



Autor: Gary R. Goldstein, Simonetta Liuti

Fuente: https://arxiv.org/







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