  We report measurements of single-particle inclusive spectra and two-particle
azimuthal distributions of charged hadrons at high transverse momentum (high
$p_T$) in minimum bias and central d+Au collisions at $\sqrt{s_{NN}}$=200 GeV.
The inclusive yield is enhanced in d+Au collisions relative to binary-scaled
p+p collisions, while the two-particle azimuthal distributions are very similar
to those observed in p+p collisions. These results demonstrate that the strong
suppression of the inclusive yield and back-to-back correlations at high $p_T$
previously observed in central Au+Au collisions are due to final-state
interactions with the dense medium generated in such collisions.
