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

=200GeVでの金+金衝突におけるハドロンの異方的フローの高次項の測定

Adare, A.*; 今井 憲一; 永宮 正治; 谷田 聖   ; PHENIX Collaboration*; 他385名*

Adare, A.*; Imai, Kenichi; Nagamiya, Shoji; Tanida, Kiyoshi; PHENIX Collaboration*; 385 of others*

Measurements of the anisotropic flow coefficients , , , and , for identified particles (, , and ) at midrapidity, obtained relative to the event planes at forward rapidities in Au + Au collisions at 200 GeV, are presented as a function of collision centrality and particle transverse momenta . The coefficients show characteristic patterns consistent with hydrodynamical expansion of the matter produced in the collisions. For each harmonic , a modified valence quark-number scaling [plotting versus transverse kinetic energies ] is observed to yield a single curve for all the measured particle species for a broad range of . A simultaneous blast-wave model fit to the observed coefficients and published particle spectra identifies radial flow anisotropies and spatial eccentricities at freeze-out. These are generally smaller than the initial-state participant-plane geometric eccentricities as also observed in the final eccentricity from quantum interferometry measurements with respect to the event plane.