Measurement of the higher-order anisotropic flow coefficients for identified hadrons in Au + Au collisions at sNN =200 GeV

Summary, in English

Measurements of the anisotropic flow coefficients v2{Ψ2},v3{Ψ3},v4{Ψ4}, and v4{Ψ2} for identified particles (π±,K±, and p+p) at midrapidity, obtained relative to the event planes Ψm at forward rapidities in Au + Au collisions at sNN=200GeV, are presented as a function of collision centrality and particle transverse momenta pT. The vn coefficients show characteristic patterns consistent with hydrodynamical expansion of the matter produced in the collisions. For each harmonic n, a modified valence quark-number Nq scaling [plotting vn{Ψm}/(Nq)n/2 versus transverse kinetic energies (KET)/Nq] is observed to yield a single curve for all the measured particle species for a broad range of KET. A simultaneous blast-wave model fit to the observed vn{Ψm}(pT) coefficients and published particle spectra identifies radial flow anisotropies ρn{Ψm} and spatial eccentricities sn{Ψm} at freeze-out. These are generally smaller than the initial-state participant-plane geometric eccentricities n{ΨmPP} as also observed in the final eccentricity from quantum interferometry measurements with respect to the event plane. © 2016 American Physical Society.

• Author: A Adare; S. Afanasiev; C. Aidala; N. N. Ajitanand; Y. Akiba; H Al-Bataineh; Peter Christiansen; Hans-Åke Gustafsson; Eva Haslum; Anders Oskarsson; Sarah Rosendahl; Evert Stenlund
• Department/s: Particle and nuclear physics
• Publishing year: 2016
• Language: English
• Publication/Series: Physical Review C: covering nuclear physics
• Volume: 93
• Issue: 5
• Links: http://dx.doi.org/10.1103/PhysRevC.93.051902
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 2469-9985