Azimuthal anisotropy measurements of strange and multistrange hadrons in U+U collisions at sNN=193 GeV at the BNL Relativistic Heavy Ion Collider

2021/03/31 by STAR Collaboration, M. S. Abdallah, J. Adam +391
Physics and Astronomy · #Anisotropy #Geometry #Hadron #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scaling #nucl-ex

paper · pdf · doi:10.1103/physrevc.103.064907

published as Phys. Rev. C 103, 064907 (2021) · 22 pages, 16 figures

openalex publication_date 2021/06/16 · arxiv created 2021/06/18 · arxiv updated 2021/06/21 · openalex created_date 2021/06/22 · openalex updated_date 2026/08/05

Abstract

We present systematic measurements of azimuthal anisotropy for strange and multistrange hadrons (K_s⁰, \mathrm\ensuremathΛ, \mathrm\ensuremathΞ, and \mathrm\ensuremathΩ) and \ensuremathφ mesons at midrapidity (|y|< 1.0) in collisions of U+U nuclei at √s_NN=193 GeV, recorded by the STAR detector at the Relativistic Heavy Ion Collider. Transverse momentum (p_T) dependence of flow coefficients (v₂, v₃, and v₄) is presented for minimum bias collisions and three different centrality intervals. Number of constituent quark scaling of the measured flow coefficients in U+U collisions is discussed. We also present the ratio of v_n scaled by the participant eccentricity (\ensuremathε_n\2\) to explore system size dependence and collectivity in U+U collisions. The magnitude of v₂/\ensuremathε₂ is found to be smaller in U+U collisions than that in central Au+Au collisions contradicting naive eccentricity scaling. Furthermore, the ratios between various flow harmonics (v₃/v₂^3/2, v₄/v₂^4/2) are studied and compared with hydrodynamic and transport model calculations.

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