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Fast parton probes produced by hard scattering and embedded within collisionsof large nuclei have shown that partons suffer large energy loss and that theproduced medium may respond collectively to the lost energy. We presentmeasurements of neutral pion trigger particles at transverse momenta p^t_T =4-12 GeV/c and associated charged hadrons (p^a_T = 0.5-7 GeV/c) as a functionof relative azimuthal angle Delta Phi at midrapidity in Au+Au and p+pcollisions at sqrt(s_NN) = 200 GeV. These data lead to two major observations.First, the relative angular distribution of low momentum hadrons, whose shapemodification has been interpreted as a medium response to parton energy loss,is found to be modified only for p^t_T < 7 GeV/c. At higher p^t_T, the data areconsistent with unmodified or very weakly modified shapes, even for the lowestmeasured p^a_T. This observation presents a quantitative challenge to mediumresponse scenarios. Second, the associated yield of hadrons opposite to thetrigger particle in Au+Au relative to that in p+p (I_AA) is found to besuppressed at large momentum (IAA ~ 0.35-0.5), but less than the singleparticle nuclear modification factor (R_AA ~0.2).

Trends in Yield and Azimuthal Shape Modification in Dihadron Correlations in Relativistic Heavy Ion Collisions