# $\Omega$ and $\phi$ in Au + Au ~collisions at \srt~= 200 and 11.5 GeV from a multiphase transport model

## TL;DR

This study uses a multiphase transport model to analyze the production and properties of $$ and $$ particles in Au+Au collisions at different energies, revealing the dominance of partonic interactions at high energy and hadronic interactions at lower energy.

## Contribution

It demonstrates the effectiveness of the AMPT model with different configurations in describing particle production at varying collision energies, highlighting the transition from partonic to hadronic dominance.

## Key findings

- AMPT model with string melting describes high-energy data well.
- Default AMPT model fits lower-energy data accurately.
- Results support a transition from partonic to hadronic interactions with decreasing energy.

## Abstract

Within the framework of a multiphase transport model, we study the production and properties of $\Omega$ and $\phi$ in Au + Au collisions with a new set of parameters for $\sqrt{s_{NN}}$ = 200 GeV and with the original set of parameters for $\sqrt{s_{NN}}$ = 11.5 GeV, respectively. The AMPT model with the string melting version provides a reasonable description at $\sqrt{s_{NN}}$ = 200 GeV and while the AMPT model with default version describes the data well at $\sqrt{s_{NN}}$ = 11.5 GeV. It indicates that the system created at top RHIC energy is dominated by partonic interaction and while the hadronic interaction becomes important at lower beam energy, such as $\sqrt{s_{NN}}$ = 11.5 GeV. The comparison of $N(\Omega ^++\Omega^-)/[2N(\phi)]$ ratio between data and calculations further supports the argument. Our calculations can generally describe the data of nuclear modification factor as well as elliptic flow.