Three-Nucleon Correlations in Light Nuclei Yields Ratios from AMPT Model for QCD Critical Point Investigation

TL;DR

This study uses the AMPT model to analyze three-nucleon correlations in light nuclei yields from Au+Au collisions, highlighting the importance of including these correlations for accurate neutron density fluctuation estimates and providing a baseline for QCD critical point searches.

Contribution

It introduces the consideration of three-nucleon correlations in the AMPT model, improving agreement with experimental yield ratios and offering a baseline for critical phenomena investigation.

Findings

Neglecting $C_{n^2p}$ overestimates neutron fluctuations.

Including $C_{n^2p}$ improves agreement with experimental ratios.

The model does not reproduce the energy-dependent peak around 20-30 GeV.

Abstract

This research use the AMPT model in Au+Au collisions to study the influence of the three nucleons correlation $C_{n^2p}$ on the light nuclei yield ratios. It is found that neglecting $C_{n^2p}$ leads to an overestimated relative neutron density fluctuation extraction. Including $C_{n^2p}$ will enhances the agreement with experimental results with higher yield ratios, yet it does not change the energy dependence of the yield ratio. Since there is no first-order phase transition or critical physics in the AMPT model, our work fails to reproduce the experimental energy-dependent peak around $\sqrt{s_\text{NN}} = $20-30 GeV. Our work might offer a baseline for investigating critical physics phenomena using the light nuclei production as a probe.