Investigating nonflow contribution subtraction in d-Au collisions with AMPT model

TL;DR

This study uses the AMPT model to analyze nonflow contributions in d-Au collisions at 200 GeV, showing that subtraction methods yield consistent elliptic flow results across centralities and align with experimental data.

Contribution

It introduces and compares two nonflow subtraction methods in small collision systems, providing insights into their effectiveness and impact on elliptic flow measurements.

Findings

Nonflow effects are not strongly dependent on peripheral subtraction.

Elliptic flow after subtraction is consistent across centralities.

Results agree with experimental measurements.

Abstract

This paper presents research that focuses on nonflow contribution subtraction in heavy-ion collisions, using a multiphase transport model (AMPT). Specifically, the study aims to investigate the behavior of charged particle elliptic flow ($v_{\rm 2}$) in d-Au collisions at a collision energy of $\sqrt{s_{\rm NN}} = 200$ GeV and to determine the impact of nonflow sources, such as jet correlations and resonance decays, in small collision systems. To reduce nonflow effects, the per-trigger yield distribution in peripheral d-Au collisions or pp collisions with the same collision energy is subtracted. Our results show that the nonflow effects in central and mid-central collisions are not strongly dependent on subtracting the per-trigger yield distribution in peripheral d-Au collisions or pp collisions. Furthermore, the elliptic flow of charged particles, after removing nonflow effects through two subtracting methods from this work, exhibits consistency in various collision centrality classes. We also discuss comparisons with measurements from d-Au collisions at $\sqrt{s_{\rm NN}} = 200$ GeV. Overall, this work provides valuable insights and serves as a reference for researchers studying nonflow contribution subtraction in experiments with small collision systems.