Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-07-03
Acta Phys.Polon. B33 (2002) 3299-3304
Physics
High Energy Physics
High Energy Physics - Phenomenology
A talk presented at DIS2002, 30 April - 4 May 2002, Cracow
Scientific paper
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 $z$.
Szczurek Antoni
Uleshchenko V.
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