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We discuss the relation between the infrared singularities of on-shellpartonic form factors and parton distribution functions (PDFs) near the elasticlimit, through their factorisation in terms of Wilson-line correlators.Ultimately we identify the difference between the anomalous dimensionscontrolling single poles of these two quantities to all loops in terms of theclosed parallelogram Wilson loop. To arrive at this result we first use thecommon hard-collinear behaviour of the two to derive a relation between theirrespective soft singularities, and then show that the latter is manifested interms of differing Wilson-line geometries. We perform explicit diagrammaticcalculations in configuration space through two loops to verify the relation.More generally, the emerging picture allows us to classify collinearsingularities in eikonal quantities depending on whether they are associatedwith finite (closed) Wilson-line segments or infinite (open) ones.

Wilson-line geometries and the relation between IR singularities of form factors and the large-x limit of DGLAP splitting functions