Azimuthal anisotropy of K^0_S and Lambda production at mid-rapidity from Au+Au collisions at root s_NN = 130 GeV

TL;DR

This paper reports measurements of azimuthal anisotropy (v2) for strange particles K0S and Lambda in gold-gold collisions at RHIC, showing a strong transverse momentum dependence up to 2 GeV/c.

Contribution

First measurement of v2 for K0S and Lambda at RHIC energies, comparing results with theoretical models to understand particle production mechanisms.

Findings

v2 increases with pt up to ~2 GeV/c

v2 shows dependence on collision centrality

Results agree with some hydrodynamic model predictions

Abstract

We report STAR results on the azimuthal anisotropy parameter v2 for strange particles K0S and Lambda at midrapidity in Au+Au collisions at /s_NN = 130 GeV at RHIC. The value of v2 as a function of transverse momentum pt and collision centrality is presented for both particles and compared to model calculations. A strong pt dependence in v2 is observed up to pt ~2.0 GeV/c where v2 begins to saturate.