Azimuthal Anisotropy in U+U Collisions at $\sqrt{s_{NN}} = 193 $ GeV with STAR Detector at RHIC

TL;DR

This paper measures azimuthal anisotropy coefficients in uranium-uranium collisions at 193 GeV using the STAR detector, providing data to constrain models of initial conditions and medium properties in heavy ion collisions.

Contribution

It presents the first detailed measurement of multiple harmonic coefficients in U+U collisions at this energy, including ultra-central collisions, across various transverse momenta and centralities.

Findings

Measured $v_{n}$ coefficients for $n=1$ to 5.

Provided data in ultra-central collisions.

Constrained initial condition models and medium transport properties.

Abstract

We report the measurement of first (\textit {n} = 1) and higher order(\textit{n} = 2-5) harmonic coefficients ($v_{n}$) of the azimuthal anisotropy in the distribution of the particles produced in U+U collisions at $\sqrt{s_{NN}}$ =193 GeV, recorded with the STAR detector at RHIC. The differential measurement of $(v_{n})$ is presented as a function of transverse momentum ($p_{T}$) and centrality. We also present $v_{n}$ measurement in the ultra-central collisions. These data may provide strong constraints on the theoretical models of the initial condition in heavy ion collisions and the transport properties of the produced medium.