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High-$p_T$ hadron-hadron correlations have been measured with the PHENIXexperiment in $\Cu$ and $\pp$ collisions at $\sqrt{s_{NN}}=200$ GeV. Acomparison of the jet widths and yields between the two colliding systemsallows us to study the medium effect on jets. We also present a firstmeasurement of direct photon-hadron correlations in $\Au$ and $\pp$ collisions.We find that the near-side yields are consistent with zero in both systems. Bycomparing the jet yields on the away side, we observe a suggestion of theexpected suppression of hadrons associated with photons in $\Au$ collisions.

PHENIX Measurement of High-$p_T$ Hadron-hadron and Photon-hadron Azimuthal Correlations