Bounds on transverse momentum dependent distribution functions

Abstract

When more than one hadron takes part in a hard process, an extended set of quark distribution and fragmentation functions becomes relevant. In this talk, the derivation of Soffer-like bounds for these functions, in the case of a spin-1/2 target, is sketched and some of their aspects are discussed.

Comments: Talk presented at International Workshop on Symmetries and Spin (Praha Spin 2000), Prague, Czech Republic, 17-22 Jul 2000