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

Le résumé fourni par la source

Measurements of the anisotropic flow coefficients ${v}_{2}{{\mathrm{\ensuremath{\Psi}}}_{2}},\phantom{\rule{0.28em}{0ex}}{v}_{3}{{\mathrm{\ensuremath{\Psi}}}_{3}},\phantom{\rule{0.28em}{0ex}}{v}_{4}{{\mathrm{\ensuremath{\Psi}}}_{4}}$, and ${v}_{4}{{\mathrm{\ensuremath{\Psi}}}_{2}}$ for identified particles (${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}},\phantom{\rule{0.28em}{0ex}}{K}^{\ifmmode\pm\else\textpm\fi{}}$, and $p+\overline{p}$) at midrapidity, obtained relative to the event planes ${\mathrm{\ensuremath{\Psi}}}_{m}$ at forward rapidities in Au + Au collisions at $\sqrt{{s}_{{}_{NN}}}=200\phantom{\rule{0.28em}{0ex}}\mathrm{GeV}$, are presented as a function 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 ${v}_{n}{{\mathrm{\ensuremath{\Psi}}}_{m}}/{({N}_{q})}^{n/2}$ versus transverse kinetic energies $({\mathrm{KE}}_{T})/{N}_{q}]$ is observed to yield a single curve for all the measured particle species for a broad range of ${\mathrm{KE}}_{T}$. A simultaneous blast-wave model fit to the observed ${v}_{n}{{\mathrm{\ensuremath{\Psi}}}_{m}}({p}_{T})$ coefficients and published particle spectra identifies radial flow anisotropies ${\ensuremath{\rho}}_{n}{{\mathrm{\ensuremath{\Psi}}}_{m}}$ and spatial eccentricities ${s}_{n}{{\mathrm{\ensuremath{\Psi}}}_{m}}$ at freeze-out. These are generally smaller than the initial-state participant-plane geometric eccentricities ${\ensuremath{\varepsilon}}_{n}{{\mathrm{\ensuremath{\Psi}}}_{m}^{\mathrm{PP}}}$ as also observed in the final eccentricity from quantum interferometry measurements with respect to the event plane.

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