Simulation of energy scan of pion interferometry in central Au + Au collisions at relativistic energies

TL;DR

This paper uses the AMPT model to analyze two-pion interferometry in central Au+Au collisions across a wide energy range, providing insights into source size parameters and their dependencies relevant for RHIC-STAR experiments.

Contribution

It offers a systematic theoretical analysis of HBT radii and chaotic parameters across multiple energies, filling a gap in understanding energy dependence in heavy-ion collisions.

Findings

HBT radii are relatively stable above 7 GeV/c.

At 200 GeV/c, radii decrease with increasing transverse momentum.

Radiii are insensitive to azimuthal angle at 200 GeV/c.

Abstract

We present a systematic analysis of two-pion interferometry for the central Au+Au collisions at $\sqrt{S_{NN}}$ = 3, 5, 7, 11, 17, 27, 39, 62, 130 and 200 GeV/c with the help of a multiphase transport (AMPT) model. Emission source-size radius parameters $R_{long}$, $R_{out}$, $R_{side}$ and the chaotic parameter $\lambda$ are extracted and compared with the experimental data. Transverse momentum and azimuthal angle dependencies of the HBT radii are also discussed for central Au+Au collisions at 200 GeV/c. The results show that the HBT radii in central collisions do not change much above 7 GeV/c. For central collisions at 200GeV/c, the radii decrease with the increasing of transverse momentum $p_{T}$ but not sensitive to the azimuthal angle. These results provide a theoretical reference for the energy scan program of the RHIC-STAR experiment.