Impact parameter dependence of parton densities at low x

Abstract

We consider impact parameter dependence of the polarized and unpolarized parton densities. Unitarity does not allow factorization of these structure functions over the Bjorken x and the impact parameter b variables. On the basis of the particular geometrical model approach we conclude that spin of constituent quark may have a significant orbital angular momentum component which can manifest itself through the peripherality of the spin dependent structure functions.

Comments: 4 pages, to appear in the Proceedings of the Workshop Diffraction 2000, Cetraro, Italy, 2-7 September 2000