Abstract
We calculate the contribution of vector meson dominance todeeply inelastic lepton-nucleon scattering in the kinematicregion of the HERMES experiment.The results obtained show that this contributionis quite significant. Together with the fact that thereexist very striking left-right asymmetries for hadronsproduced in single-spin hadron-hadron collisions, these resultsimply that the single-spin azimuthal asymmetryobserved by HERMES cannot be simply regarded asa pure fragmentation effect.
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