Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-12-03
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 4 figures. Presented at the International Conference "Photon-2011", 22-27 May 2011 Spa, Belgium
Scientific paper
Different approaches to the problem of a gauge-invariant operator definition of transverse-momentum dependent parton densities (TMDs) are reviewed and compared from the point of view of their compatibility with the operator definition of collinear (integrated) parton distribution functions. In particular, geometry of the longitudinal and transverse gauge links (Wilson lines) both in unsubtracted quark TMDs and in the associate soft factors is addressed. A possible connection between different operator definitions is also discussed.
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