Azimuthal anisotropy measurement of multi-strange hadrons in Au+Au collision at √SNN = 27 and 54.4 GeV at STAR

Prabhupada Dixit,(For The Star Collaboration)

doi:10.1051/epjconf/202225910012

Prabhupada Dixit, (For The Star Collaboration)

Open Access

https://doi.org/10.1051/epjconf/202225910012

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Abstract

In these proceedings, we present the second order (ν2) and the third order (ν3) azimuthal anisotropy measurements of strange and multi-strange hadrons such as KS0, Λ, Λ¯, ϕ, Ξ−, Ξ¯+, Ω−, Ω¯+ in Au+Au collisions at √SNN = 27 and 54.4 GeV at STAR. The centrality dependence of ν2 and ν3 as well as the number of constituent quark scaling (NCQ scaling) for all the particles mentioned above are discussed. The ratio of ν2 of ϕ mesons to that of p¯ is presented at √SNN = 54.4 GeV which gives a hint of mass ordering violation at low pT.

Highlights

Relativistic heavy-ion collision is a unique tool to study matter at the extreme conditions of temperature and density
The event-by-event fluctuations of the nucleons in the colliding nuclei can give rise to other types of flow such as triangular flow, rectangular flow, etc. All these flow coefficients can be studied by using Fourier series expansion of the azimuthal distribution of particles given by d3N E d p3
The nth order flow coefficient is given by vn = cos n(φ − ψn)

Summary

Introduction

Relativistic heavy-ion collision is a unique tool to study matter at the extreme conditions of temperature and density. Depending on the initial spatial configuration of the colliding system and fluctuations, there can be the presence of different orders of anisotropy in the azimuthal distributions, known as anisotropic flow. The event-by-event fluctuations of the nucleons in the colliding nuclei can give rise to other types of flow such as triangular flow, rectangular flow, etc. All these flow coefficients can be studied by using Fourier series expansion of the azimuthal distribution of particles given by d3N E d p3. The nth order flow coefficient is given by vn = cos n(φ − ψn). We have used strange and multi-strange hadrons because of their small hadronic interaction cross-section and early freeze-out [2], the measured flow coefficients remain least affected in the hadronic phase

Analysis method

Results and discussion

Summary