Measurements of high $p_{T}$ identified particles $v_{2}$ and $v_{4}$ in $\sqrt{s_{NN}} = 200$ GeV Au+Au collisions by PHENIX

TL;DR

This paper reports measurements of elliptic flow ($v_{2}$) and quadrangular flow ($v_{4}$) for identified particles in high-energy gold-gold collisions, revealing scaling behaviors and deviations at high transverse kinetic energy.

Contribution

It provides the first detailed measurements of $v_{2}$ and $v_{4}$ for identified particles up to high transverse momentum at 200 GeV, highlighting scaling properties and their limitations.

Findings

$v_{4}$ scales with the number of constituent quarks.

All particles have a $v_{4}/v_{2}^{2}$ ratio close to 0.9.

Deviations from universal $v_{2}$ scaling occur at high transverse kinetic energy.

Abstract

The $v_{2}$ and $v_{4}$ of pions, kaons and protons have been measured by PHENIX in 200 GeV Au+Au collisions up to $p_{T}$$\sim$6 GeV/c and 4 GeV/c, respectively. The $v_{4}$ of all these identified particles have been found to scale with the number of constituent quarks and all these particles have a similar $v_{4}$/$v_{2}^{2}$ ratio which is close to 0.9. The scaling behavior of $v_2$ is studied at high-$p_{T}$ and a deviations from the universal scaling is observed for transverse kinetic energy ($K_{ET}/nq$) higher than 1 GeV.