  We report on a study of the transverse momentum dependence of nuclear
modification factors $R_{dAu}$ for charged hadrons produced in deuteron + gold
collisions at $\sqrt{s_{NN}}= 200$GeV, as a function of collision centrality
and of the pseudorapidity ($\eta = 0,1,2.2,3.2$) of the produced hadrons. We
find significant and systematic decrease of $R_{dAu}$ with increasing rapidity.
The midrapidity enhancement and the forward rapidity suppression are more
pronounced in central collisions relative to peripheral collisions. These
results are relevant to the study of the possible onset of gluon saturation at
RHIC energies.
