Longitudinal broadening of near side jets due to parton cascade

TL;DR

This study investigates how longitudinal broadening of near side jets in di-hadron correlations arises from parton cascades in heavy-ion collisions, providing insights into the properties of quark-gluon plasma.

Contribution

It demonstrates that longitudinal broadening is caused by longitudinal flow from parton cascades, using a dynamical multi-phase transport model for central Au+Au collisions.

Findings

Longitudinal broadening is observed in Au+Au collisions but not in p+p.

Parton cascade induces strong longitudinal flow leading to broadening.

Results offer insights into the strongly interacting partonic matter at RHIC.

Abstract

Longitudinal broadening along $\Delta\eta$ direction on near side in two-dimensional ($\Delta\phi \times \Delta\eta$) di-hadron correlation distribution has been studied for central Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV, within a dynamical multi-phase transport model. It was found that the longitudinal broadening is generated by a longitudinal flow induced by strong parton cascade in central Au+Au collisions, in comparison with p+p collisions at $\sqrt{s_{NN}}$ = 200 GeV. The longitudinal broadening may shed light on the information about strongly interacting partonic matter at RHIC.