Nonflow contribution to Dihadron Azimuthal Correlations in 200 GeV/c Au+Au Collisions

TL;DR

This study uses the AMPT model to analyze nonflow contributions to dihadron azimuthal correlations in 200 GeV Au+Au collisions, revealing medium modifications and $p_T$ dependence of jet contributions across different centralities.

Contribution

It provides a detailed simulation-based analysis of nonflow effects and jet-medium interactions, highlighting their dependence on collision centrality and transverse momentum.

Findings

Medium modification affects correlation shapes and jet contributions.

Strong $p_T^{assoc}$ dependence of RMS width in central collisions.

Quantified jet contributions in peripheral and central collisions.

Abstract

Dihadron azimuthal correlations in 200 GeV/c Au+Au have been simulated by a multi-phase transport (AMPT) model. Contribution from jet-medium interaction to correlation function is obtained by subtracting the combined harmonic flow background from the raw dihadron correlation function. Signals in centralities of 0-10%, 20-40% and 50-80% are compared in three associated transverse momentum ($p_{T}^{assoc}$) bins: 0.2-0.8 GeV/c, 0.8-1.4 GeV/c and 1.4-2.0 GeV/c. An obvious medium modification impact can be seen from the signal shape change and relative jet contribution in the above events, which shows different behaviors between central and peripheral events, and among different $p_{T}^{assoc}$ ranges in central events. More detailed $p_{T}^{assoc}$ dependence of the derived nonflow contribution is studied in central 0-10% events, in which a strong $p_{T}^{assoc}$ dependence of RMS width is observed. We also calculated that relative jet contributions in peripheral and central collisions in the above mentioned cases.