Abstract
We present the measurement of the azimuthal anisotropy of strange hadrons (K0s, ϕ and Λ) at mid-rapidity (|y| < 1.0) in U+U collisions at [see formula in PDF] = 193 GeV using the STAR detector at RHIC. We present the centrality and transverse momentum dependence of flow coefficients υn for n = 2, 3, 4. A strong centrality dependence of υ2 is observed for the particles K0s, ϕ and Λ in U+U collisions at [see formula in PDF] = 193 GeV similar to Au+Au collisions at [see formula in PDF] = 200 GeV. We studied the number of constituent quark scaling (NCQ) of the flow coefficients. The NCQ scaling of the flow coefficients holds within uncertainties for the particles studied in the U+U collisions. We also present the comparison of the results to the AMPT transport model.
Highlights
A strongly interacting, hot and dense medium named Quark Gluon Plasma (QGP) is believed to be created in high-energy relativistic heavy-ion collisions at Relativistic Heavy Ion Collider (RHIC) [1]
We studied the number of constituent quark scaling (NCQ) of the flow coefficients
Recent developments suggest that measurements of higher order flow harmonics can yield information about initial state fluctuations [7], which help to constrain the initial conditions of hydrodynamic simulation for a precise extraction of the QGP transport properties [8]
Summary
A strongly interacting, hot and dense medium named Quark Gluon Plasma (QGP) is believed to be created in high-energy relativistic heavy-ion collisions at Relativistic Heavy Ion Collider (RHIC) [1]. The dynamics and the collective behavior of such strongly interacting medium have been studied by measuring the azimuthal anisotropy of the produced particles relative to the reaction plane [2]. The initial spatial anisotropy is converted into momentum space anisotropy through rescatterings among the constituents in the medium. The initial coordinate space anisotropy diminishes as the system expands. Due to this self-quenching effect, the azimuthal anisotropy is thought to be sensitive to the earliest stages of heavy-ion collisions [3]. The published results for second harmonic (elliptic flow, v2) from Au+Au collisions at RHIC have demonstrated the collective expansion feature, the mass ordering of elliptic flow among various hadron species [4, 5]. Recent developments suggest that measurements of higher order flow harmonics can yield information about initial state fluctuations [7], which help to constrain the initial conditions of hydrodynamic simulation for a precise extraction of the QGP transport properties [8]
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