Jets propagation through a hadron-string medium

TL;DR

This study uses the Hadron-String-Dynamics transport approach to analyze jet propagation and correlations in heavy-ion collisions, comparing results with experimental data and exploring medium effects on jet suppression and structures.

Contribution

It introduces a nonperturbative transport model to study jet-medium interactions and compares its predictions with experimental observations, highlighting limitations in reproducing certain jet features.

Findings

HSD results show insufficient suppression of away-side jets.

The model does not reproduce Mach-cone or ridge structures observed experimentally.

Results suggest a partonic origin for observed jet phenomena.

Abstract

Di-jet correlations in nucleus-nucleus collisions are studied within the Hadron-String-Dynamics (HSD) transport approach taking into account the reaction of the medium on the jet energy loss nonperturbatively. A comparison with the STAR and PHENIX data in central Au+Au collisions at the RHIC energy $\sqrt{s}=200$ GeV is performed differentially, i.e. with respect to correlations in azimuthal angle $\Delta \phi$ and pseudorapidity $\Delta \eta$. The HSD results do not show enough suppression for the `away-side' jets in accordance with earlier perturbative studies. Furthermore, the `Mach-cone' structure for the angle distribution in the `away-side' jet as well as `ridge' long rapidity correlations in the `near-side' jet - observed by the STAR and PHOBOS Collaborations - are not seen in the HSD results, thus suggesting a partonic origin.