Azimuthal anisotropy of K0s and Lambda prduction at mid-rapidity from Au+Au collisions at root s = 130 GeV

TL;DR

This paper reports measurements of azimuthal anisotropy (v2) for strange particles K0S, Lambda, and anti-Lambda in gold-gold collisions at 130 GeV, revealing a strong transverse momentum dependence up to 2 GeV/c and comparing results with hydrodynamic models.

Contribution

It provides the first detailed v2 measurements for strange particles at RHIC energies and compares them with hydrodynamic predictions, enhancing understanding of the collision dynamics.

Findings

v2 increases with transverse momentum up to 2 GeV/c

Strong centrality dependence of v2 observed

Comparison with hydrodynamic models shows qualitative agreement

Abstract

We report STAR results on the azimuthal anisotropy parameter v2 for strange particles K0S, L and Lbar at midrapidity in Au+Au collisions at sNN = 130 GeV at RHIC. The value of v2 as a function of transverse momentum of the produced particles pt and collision centrality is presented for both particles up to pt 3.0 GeV/c. A strong pt dependence in v2 is observed up to 2.0 GeV/c. The v2 measurement is compared with hydrodynamic model calculations. The physics implications of the pt integrated v2 magnitude as a function of particle mass are also discussed.