  Measurements of the inclusive yields of pi0 mesons in p+p and d+Au collisions
at center of mass energy sqrt(s_NN)=200 GeV and pseudorapidity <eta>=4.00 (d
beam direction) are reported. The yield for p+p collisions is in general
agreement with perturbative QCD calculations. The d+Au yield is in agreement
with a calculation which models the Au nucleus as a Color Glass Condensate for
forward particle production. The nuclear modification factor derived from the
inclusive yields is qualitatively consistent with models which suppress the
gluon density in nuclei.
