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We investigate unambiguities in the extraction of the $\bar d - \bar u$asymmetry from semi-inclusive production of pions in DIS. The role of severaleffects beyond the quark-parton model (QPM) which lead to $N_p^{\pi^+} \neN_n^{\pi^+}$ and $N_p^{\pi^-} \ne N_n^{\pi^-}$ and may therefore cloud such anextraction is studied. The results are discussed in the context of the recentHERMES data. We find that the interaction of the resolved photon with thenucleon significantly modifies the observed $\bar d - \bar u$ asymmetry. Theexclusive elastic production of $\rho$ mesons plays a similar role for thelarge-$z$ data sample. Our estimate shows a rather small effect of thespectator mechanism. Nuclear effects in the deuteron also look potentiallyimportant but are difficult to estimate quantitatively.  Throughout the paper we make in addition several general remarks concerningsemi-inclusive and exclusive production of mesons.Comment: 47 pages, LaTeX with 19 eps figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>d</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mo>−</mml:mo><mml:mi>ū</mml:mi></mml:math>asymmetry and semi-inclusive production of pions in deep inelastic scattering

d¯−ūasymmetry and semi-inclusive production of pions in deep inelastic scattering