Models for transverse-momentum distributions and transversity

Abstract

I present a short review of models for transverse-momentum distributions and transversity, with a particular attention on general features common to many models. I compare some model results with experimental extractions. I discuss the existence of relations between different functions, their limits of validity, their possible use.

Comments: Talk delivered at the "Third International Workshop on Transverse Polarization Phenomena in Hard Scattering" (Transversity 2011), 29 Aug. - 2 Sep. 2011, Veli Losinj (Croatia)