Publication
Title
Anomalous dimensions of transverse-momentum dependent parton distribution functions
Author
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.
Language
English
Source (journal)
a
Publication
2008
Volume/pages
(2008), p. 1-7
Full text (publisher's version - intranet only)
UAntwerpen
 Faculty/Department Publication type Subject