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The Construction of Gauge-Links in Arbitrary Hard Processes

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arxiv hep-ph/0601171 v1 pith:3YXPM7BM submitted 2006-01-20 hep-ph

C. J. Bomhof , P. J. Mulders , F. Pijlman This is my paper
classification hep-ph
keywords gauge-linksbilocaldistributionfieldfragmentationintegrationoperatorspartonic
verification ladder T0 review T1 audit T2 compute T3 formal
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Transverse momentum dependent parton distribution and fragmentation functions are described by hadronic matrix elements of bilocal products of field operators off the light-cone. These bilocal products contain gauge-links, as required by gauge-invariance. The gauge-links are path-ordered exponentials connecting the field operators along a certain integration path. This integration path is process-dependent, depending specifically on the short-distance partonic subprocess. In this paper we present the technical details needed in the calculation of the gauge-links and a calculational scheme is provided to obtain the gauge-invariant distribution and fragmentation correlators corresponding to a given partonic subprocess.

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Cited by 5 Pith papers

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    Six leading-twist T-odd gluon TMDs of a tensor-polarized deuteron are derived analytically and evaluated numerically in a spectator model with single-gluon final-state interaction.

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