Anisotropic flow of charged and identified hadrons in thequark-gluon string model for Au+Au collisions atsNN=200GeV

Abstract

The pseudorapidity behavior of the azimuthal anisotropy parameters ${v}_{1}$ and ${v}_{2}$ of inclusive charged (${h}^{\ifmmode\pm\else\textpm\fi{}}$) hadrons and their dependence on centrality has been studied in Au+Au collisions at full relativistic-heavy-ion-collider energy of $\sqrt{{s}_{\mathit{NN}}}=200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$ within the microscopic quark-gluon string model (QGSM). The QGSM simulation results for the directed flow ${v}_{1}$ show antiflow alignment within the pseudorapidity range $|\ensuremath{\eta}|\ensuremath{\le}2$ in fair agreement with the experimental ${v}_{1}(\ensuremath{\eta})$ data, but it cannot reproduce the further development of the antiflow up to $|\ensuremath{\eta}|\ensuremath{\simeq}3.5$. The \ensuremath{\eta} dependence of the elliptic flow ${v}_{2}$ extracted from the simulations agrees well with the experimental data in the whole pseudorapidity range for different centrality classes. The centrality dependence of the integrated elliptic flow of charged hadrons in the QGSM almost coincides with the PHOBOS experimental distribution. The transverse momentum dependence of the elliptic flow of identified (${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}},{K}^{\ifmmode\pm\else\textpm\fi{}},p,\overline{p}$) and inclusive charged hadrons is studied also. The model reproduces quantitatively the low-${p}_{T}$ part of the distributions rather well, but it underestimates the measured elliptic flow for transverse momenta ${p}_{T}>1\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}/c$. Qualitatively, however, the model can reproduce the saturation of the ${v}_{2}({p}_{T})$ spectra with rising ${p}_{T}$ as well as the crossing of the elliptic flow for mesons and baryons.