TMDs, universality and factorization

Abstract

We present a short overview on transverse momentum dependent parton distribution and fragmentation functions, giving their partonic interpretation and ways to access them. We then discuss the issue of their universality and its connection to factorization in perturbative QCD.

Comments: 8 pages, 1 ps figure, uses cimento.cls. Talk delivered at the "Third International Workshop on Transverse Polarization Phenomena in Hard Scattering" (Transversity 2011), 29 Aug.-2 Sep. 2011, Veli Losinj (Croatia). Submitted to Nuovo Cimento C