Complex Euclidean Wilson line directions map to space-like rapidity, giving a one-loop match to the Collins soft function and a promising lattice ratio, though the numerical ratio is not yet physical.
New definition of TMD parton densities
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I give an account of a new definition of transverse-momentum-dependent parton densities. The new definition solves a number of difficulties and inconsistencies in earlier definitions.
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Measurement of the TMD soft function on the lattice using the auxiliary field representation of the Wilson line
Complex Euclidean Wilson line directions map to space-like rapidity, giving a one-loop match to the Collins soft function and a promising lattice ratio, though the numerical ratio is not yet physical.