Distribution and fragmentation functions in a spectator model

Abstract

Quark distribution and spectator functions are estimated in a diquark spectator model. The representation of the functions in terms of non-local operators together with the rather simple model allow estimates for the yet experimentally undetermined functions, like the polarized fragmentation functions or higher twist functions.

Comments: 10 pages, LaTex, uses sprocl.sty and epsfig.sty, To appear in the proceedings of the Conference on Perspectives in Hadronic Physics, Trieste, Italy, 12-16 May, 1997