The presentation is concerned with higher twist corrections of nonpartonic origin to semi-inclusive observables in the kinematical region relevant for the HERMES experiment. We demonstrate a strong impact of the VDM-like interaction and the exclusive production of \rho 0 meson on the extraction of the \bar d--\bar u asymmetry from charged pion DIS multiplicities. We also show that it is the exclusive-\rho 0 channel which accounts for the experimentally observed effect of the excess of charged over neutral pions produced at large z.
PACS numbers: 13.60.Le, 13.60.Hb
| Table of Contents | Back to Number 10 contents |