Unpolarized and Polarized Fragmentation Functions

Abstract

I give an overview of the present knowledge about nonperturbative functions parametrizing the fragmentation into one or two hadrons of (un)polarized light quarks in vacuum, including information on their transverse momentum dependence.

Comments: Extended version from the proceedings of the 3rd International Workshop on Transverse Polarization Phenomena in Hard Scattering (Transversity 2011), Veli Losinj (Croatia), Aug.29th-Sept.2nd 2011; 9 figures in pdf format; Nuovo Cimento class file provided; updated reference