Title
Anomalous dimensions of transverse-momentum dependent parton distribution functions
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Subject
Physics
Source (journal)
a
Volume/pages
(2008) , p. 1-7
Carrier
E
Target language
English (eng)
Abstract
We discuss recent developments in the understanding of gauge-invariant transverse-momentum dependent (TMD) parton-distribution functions (PDF). We compute the leading-order MS¯¯¯¯¯-scheme anomalous dimension of such a quantity in the light-cone gauge and show that it receives a contribution that can be associated with a cusp obstruction at transverse light-cone infinity. This anomalous dimension is intimately related to expectation values composed of fields and eikonal factors along a cusped contour and is absent in covariant gauges. The implications of these findings are addressed and a modified definition of TMD PDFs is proposed.
E-info
https://repository.uantwerpen.be/docman/iruaauth/1ab42a/bed7b76c50e.pdf