Detailed study of parton energy loss via measurement of fractional momentum loss of high $p_T$ hadrons in heavy ion collisions

TL;DR

This paper presents measurements of the fractional momentum loss of high transverse momentum hadrons in heavy ion collisions across different energies, revealing global features and merging behaviors when plotted against particle multiplicity.

Contribution

It provides the first systematic comparison of fractional momentum loss across multiple collision energies and identifies universal behaviors related to particle multiplicity.

Findings

Fractional momentum loss varies by a factor of six across energies.

High-energy collision data merge into lower-energy data when plotted against particle multiplicity.

Global features of energy loss are identified through various collision parameters.

Abstract

PHENIX measurement of the fractional momentum loss ($d p_T/p_T$) of high $p_T$ identified hadrons are presented. The $d p_T/p_T$ of high $p_T$ pizero which are computed from 39GeV Au+Au over to 2.76TeV Pb+Pb are found to vary by a factor of six. We plotted the $d p_T/p_T$ against several global variables, $N_{part}$, $N_{qp}$ and $dN/deta$, and found global features. It was found that 200GeV Au+Au points are merging into the central 2.76TeV Pb+Pb points when plotting $d p_T/p_T$ against $dN/deta$.