New results on gauge-invariant TMD PDFs in QCD
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The renormalization properties of unintegrated (transverse-momentum dependent) parton distribution functions (TMD PDF's) are used for analyzing their completely gauge-invariant definition. To this end, the UV anomalous dimension is calculated at the one-loop order in the light-cone gauge and a consistent treatment of the extra singularities, which produce undesirable contributions in the anomalous dimensions, is given. The generalized definition of a TMD PDF, based on the renormalization procedure for the Wilson exponentials with obstructions, is proposed. The reduction of the re-defined TMD PDF to the integrated PDF's, as well as their probabilistic interpretation, are discussed.
7 pages, 2 figures. Talk presented by the first author at 15th International Seminar on High Energy Physics QUARKS-2008, Sergiev Posad, Russia, 23-29 May, 2008. v2: typo in the Eq. (20) corrected
7 pages, 2 figures. Talk presented by the first author at 15th International Seminar on High Energy Physics QUARKS-2008, Sergiev Posad, Russia, 23-29 May, 2008. v2: typo in the Eq. (20) corrected