Dipole asymmetry at $\sqrt{s_{NN}} = 200$ GeV Au+Au Collisions from STAR experiment at RHIC

TL;DR

This paper presents the first measurements of azimuthal anisotropy caused by dipole asymmetry in gold-gold collisions at 200 GeV, using STAR experiment data at RHIC, revealing insights into initial geometry fluctuations.

Contribution

It provides the first experimental measurement of dipole asymmetry-induced azimuthal anisotropy at RHIC energies, comparing results with theoretical models.

Findings

Azimuthal anisotropy signal is nearly symmetric in pseudorapidity.

The anisotropy varies with pseudorapidity and transverse momentum.

Results are consistent with certain model predictions.

Abstract

We report the first measurements of azimuthal anisotropy at midrapidity originated from the dipole asymmetry due to fluctuations in the initial geometry in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV, based on data from the STAR experiment at the Relativistic Heavy Ion Collider. The signal is almost symmetric in pseudorapidity and we report it as a function of pseudorapidity and transverse momentum for different centrality. Results are compared with available model predictions