Semi-inclusive production of pions in DIS and $\bar{d}-\bar{u}$ asymmetry

V. Uleshchenko, A. Szczurek, J. Speth

We discuss the role of some nonpartonic effects which lead to $N_p^{{\pi }^{+}}\ne N_n^{{\pi }^{+}}$ and $N_p^{{\pi }^{-}}\ne N_n^{{\pi }^{-}}$ and may therefore modify the conclusionon the $\bar d - \bar u…