Theory of transverse-momentum parton densities : solving the puzzle of divergencesTheory of transverse-momentum parton densities : solving the puzzle of divergences
Faculty of Sciences. Physics
Elementary Particle Physics
(2011), p. 1-6
The current status of the theoretical understanding of the transverse-momentum dependent parton densities (TMDs) is discussed. Special attention is payed to the difference between the operator definitions of TMDs proposed so far, the treatment of specific divergences, the geometry of the gauge links, and the role of the soft factors.