Does the $D^{-}/D^{+}$ production asymmetry decrease at large $x_F$?

Abstract

We have applied the meson cloud model (MCM) to calculate the asymmetries in $D$ and $D_s$ meson production in high energy ${\Sigma }^{-}$-nucleus and ${\pi }^{-}$-nucleus collisions. We find a good agreement with recent data. Our results suggest that the asymmetries may decrease at large $x_F$.

Comments: revised version with new figures and added references to appear in Phys. Rev. Lett