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Di-jet correlations in heavy-ion collisions within the HSD transport approach

A systematic study of correlations in pseudorapidity and azimuthal angle for highpT charged hadrons in heavyion collisions at the top RHIC energy has been performed within the Hadron String Dynamics (HSD) transport approach [1]. The study shows that a significant part of the high pT hadron attenuation seen experimentally can be attributed to inelastic interactions of ’leading’ pre-hadro ns 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 lin e 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 [2, 3]. Furthermore, our calculations do not show a ’ridge’ in ∆η on the near-side which also indicates additional non-hadroni c correlations. The di-jet correlations are measured as a function of azimuthal angle∆φ and pseudorapidity ∆η between the trigger and associated particles: