Jet Studies in STAR via 2+1 Correlations

TL;DR

This study introduces a new multi-hadron correlation technique called 2+1 to analyze jet-medium interactions at RHIC, revealing no significant modification in associated hadron distributions across different collision systems.

Contribution

The paper presents the 2+1 correlation method as a novel approach to study di-jet structures and medium effects in heavy-ion collisions.

Findings

No evident modification of associated hadron spectra from d+Au to Au+Au collisions.

The 2+1 method effectively probes di-jet correlations with different trigger configurations.

Abstract

This paper reports analysis on jet-medium interactions and di-jet surface emission bias at RHIC, based on a new multi-hadron correlation technique called \texttt{2+1} where back-to-back high $p_{T}$ hadron triggers work as proxy of di-jets. In contrast with traditional correlations with single triggers, the associated hadron distributions and spectra at both trigger sides show no evident modification from d+Au to central Au+Au collisions. This observation stands for both cases when triggers pairs are symmetric($p_T>$5GeV/$c$ vs. $p_T>$4GeV/$c$) or asymmetric($E_T>$10GeV/$c$ vs. $p_T>$4GeV/$c$).