Investigating the origin of the long range pseudo rapidity correlation in 2d di-hadron measurements from STAR

TL;DR

This paper investigates the origin of the ridge structure observed in di-hadron correlations in heavy ion collisions, aiming to understand the underlying physics of the hot dense matter created.

Contribution

It presents new analysis of the $<$$p_{T}$$>$ dependence and discusses potential jet and non-jet contributions to the ridge.

Findings

Evidence for $<$$p_{T}$$>$ dependence of the ridge

Discussion of jet and non-jet contributions

Insights into the origin of the ridge structure

Abstract

Angular di-hadron correlations reveal novel structures in central Au+Au collisions at $\sqrt{S_{NN}}$ = 200 GeV. One of them, known as the ridge, is elongated in pseudo rapidity and peaks on the near side ($\Delta\phi$ $\approx$ 0). Investigating the origin of the ridge structure helps to understand the hot dense matter that is created in ultra relativistic heavy ion collisions. Results showing the $<$$p_{T}$$>$ dependence of the ridge structure are presented. Evidence for possible jet and non-jet contributions to the ridge structure will be discussed.