Abstract
We present a systematic study of correlations in pseudorapidity and azimuthal angle for high-pT charged hadrons in heavy-ion collisions at the top RHIC energy within the Hadron-String Dynamics (HSD) transport approach. The study shows that a significant part of the high pT hadron attenuation seen experimentally can be attributed to inelastic interactions of 'leading' pre-hadrons with the dense hadronic environment. It turns out that the 'far-side' correlations are suppressed by up to 60% in central collisions due to the pre-hadronic interactions in line with earlier studies. Since a much larger suppression is observed experimentally in central reactions there should be strong additional partonic interactions in the dense QGP medium created in Au+Au collisions at RHIC. Furthermore, our calculations do not show a 'ridge' on the near-side which also indicates additional non-hadronic correlations.
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