Elliptic flow of transported and non-transported proton in Au+Au collisions within the UrQMD model

TL;DR

This study uses the UrQMD model to analyze the elliptic flow of transported and non-transported protons in Au+Au collisions across various energies, revealing differences consistent with experimental data at low energies.

Contribution

It introduces a method to distinguish transported from non-transported protons in elliptic flow analysis within the UrQMD framework, explaining observed flow differences.

Findings

UrQMD reproduces low-energy elliptic flow data well.

Differences in elliptic flow between protons and anti-protons are observed.

Model deviations at high energies suggest additional physics.

Abstract

With the framework of UrQMD model, by tracing the number of initial quarks in protons, we study the elliptic flow of transported protons, poduced protons and anti-protons in Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7, 11.5, 39, 200 GeV. The difference of elliptic flow between transported protons and anti-protons is observed. The results of UrQMD model show a good agreement with the STAR results at low energies, but are deviate at high energies. It partly explains the $v_{2}$ difference between proton and anti-proton observed in the Beam Energy Scan program in Relativistic Heavy Ion Collider~(RHIC).