/ nucl-ex arXiv:1412.1038

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

Pages: 8

Abstract: New PHENIX 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 $p+\\bar{p}$) obtained relative to the event planes $\\Psi_n$ in Au$+$Au collisions at $\\sqrt{s_{_{NN}}}$ = 200 GeV are presented as functions of collision centrality and particle transverse momenta $p_T$. The $v_n$ 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 $v_n/(n_q)^{n/2}$ versus ${\\rm KE}_T/n_q$ is observed to yield a single curve for all the measured particle species for a broad range of transverse kinetic energies ${\\rm KE}_T$. A simultaneous blast wave model fit to the observed particle spectra and $v_n(p_T)$ coefficients identifies spatial eccentricities $s_n$ at freeze-out, which are much smaller than the initial-state geometric values.

Note: *Brief entry*; *Temporary entry*; 387 authors, 8 pages, 4 figures, 1 table. Submitted to Phys. Rev. Lett. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

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Запись создана 2015-01-12, последняя модификация 2015-01-12

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