Nonpartonic effects in pion electroproduction in the HERMES kinematical region
Abstract
Description
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 $ρ^0$ meson on the extraction of the $\bar d - \bar u$ asymmetry from charged pion DIS multiplicities. We also show that it is the exclusive-$ρ^0$ channel which accounts for the experimentally observed effect of the excess of charged over neutral pions produced at large $z$.
A talk presented at DIS2002, 30 April - 4 May 2002, Cracow
A talk presented at DIS2002, 30 April - 4 May 2002, Cracow