Transverse-momentum-dependent parton distributions at the edge of the lightcone

Details Transverse-momentum-dependent parton distributions at the edge of the lightcone Transverse-momentum-dependent parton distributions at the edge of the lightcone

2011-08-03

arxiv.org/abs/1108.0811v1

Int. J. Mod. Phys. Conf. Ser. 4 (2011) 135-145

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures; needs ws-ijmpcs.cls (supplied). Invited talk presented at Workshop "QCD evolution of parton distributions

Scientific paper

10.1142/S2010194511001644

We present a completely gauge-invariant operator definition of transverse-momentum-dependent parton densities (TMD), supplied with longitudinal lightlike gauge links as well as transverse gauge links at lightcone infinity. Within this framework, we consider the consistent treatment of specific divergences, emerging in the "unsubtracted" TMD beyond the tree approximation, and construct the soft factors to cancel unphysical singularities. We confront this approach with factorization schemes, which make use of covariant gauges with off-the-lightcone gauge links, and discuss their mutual connection.

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