Abstract

The nuclear modification factor for d+Au collisions at s N N = 200 GeV changes from a Cronin-like enhancement of pions (and charged hadrons) at midrapidity to an increasing suppression at forward rapidities. In central Au+Au collisions at 200 GeV a strong pion suppression is observed in R A u A u at all rapidities, while protons are enhanced at all rapidities. The nuclear modification factor does not depend on rapidity.

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