Jet Properties from Di-hadron Azimuthal Correlations in d+Au Collision

Results from the different RHIC experiments reveal an enhancement of the high-$p_{T}$ single particle spectra from $d+Au$ collisions as compared to $p+p$ collisions. This enhancement is usually attributed to multiple scattering of the projectile parton in the target nucleus prior to the hard collision. Multiple scattering will also affect the acoplanarity of di-jets produced in these collisions, which is measured as an increase in $k_{T}$, the parton transverse momentum. In this talk we present high-$p_{T}$ azimuthal correlations using di-hadrons to identify di-jets in PHENIX. We present final results on the measurement of $k_{T}$ from these correlations and present the centrality dependence. These results are compared to results from $p+p$ collisions to establish the increase in $k_{T}$ due to the cold nuclear medium. We compare the results to theoretical models that reproduce the single particle sprectra from $d+Au$ collisions. These results serve as a baseline for modifications of jet structure in $Au+Au$ collisions.