Nonpartonic effects in pion electroproduction in the HERMES kinematical region

Details Nonpartonic effects in pion electroproduction in the HERMES kinematical region Nonpartonic effects in pion electroproduction in the HERMES kinematical region

2002-07-03

arxiv.org/abs/hep-ph/0207049v1

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 $z$.

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