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Measurement of the higher-order anisotropic flow coefficients for identified hadrons in Au + Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

$$sqrt{s_{NN}}$$=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 $$v_2{Psi_2 }$$, $$v_3{Psi_3 }$$, $$v_4{Psi_4 }$$, and $$v_4{Psi_2 }$$, for identified particles ($$pi^{pm}$$, $$K^{pm}$$, and $$p+bar{p}$$) at midrapidity, obtained relative to the event planes $$Psi_m$$ at forward rapidities in Au + Au collisions at $$sqrt{s_{NN}} =$$ 200 GeV, are presented as a function of collision centrality and particle transverse momenta $$p_T$$. 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 $$N_q$$ scaling [plotting $$v_n{Psi_m}/(N_q)^{n/2}$$ versus transverse kinetic energies $$(KE_{T})/N_q$$] is observed to yield a single curve for all the measured particle species for a broad range of $$KE_{T}$$. A simultaneous blast-wave model fit to the observed $$v_n{Psi_m}/(p_T)$$ coefficients and published particle spectra identifies radial flow anisotropies $$rho_n{Psi_m}$$ and spatial eccentricities $$s_n{Psi_m}$$ at freeze-out. These are generally smaller than the initial-state participant-plane geometric eccentricities $$epsilon_n{Psi_m^{PP}}$$ as also observed in the final eccentricity from quantum interferometry measurements with respect to the event plane.

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パーセンタイル:5.92

分野:Physics, Nuclear

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