Hadron spectra and elliptic flow for 200 A GeV Au+Au collisions from viscous hydrodynamics coupled to a Boltzmann cascade

Abstract

It is shown that the recently developed hybrid code VISHNU, which couples a relativistic viscous fluid dynamical description of the quark-gluon plasma (QGP) with a microscopic Boltzmann cascade for the late hadronic rescattering stage, yields an excellent description of charged and identified hadron spectra and elliptic flow measured in 200 A GeV Au+Au collisions at the Relativistic Heavy-Ion Collider (RHIC). Using initial conditions that incorporate event-by-event fluctuations in the initial shape and orientation of the collision fireball and values eta/s for the specific shear viscosity of the quark-gluon plasma that were recently extracted from the measured centrality dependence of the eccentricity-scaled, p_T-integrated charged hadron elliptic flow, we obtain universally good agreement between theory and experiment for the p_T-spectra and differential elliptic flow v_2(p_T) for both pions and protons at all collision centralities.

13 pages, 9 figures, submitted to Physical Review C. Slightly modified Figs. 2-4 in response to referee comments, added Table I. No change in conclusions

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• Relativistic Boltzmann transport approach with Bose-Einstein statistics and the onset of gluon condensation
• Nearly Perfect Fluidity in a High Temperature Superconductor
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• Initial conditions of bulk matter in ultrarelativistic nuclear collisions
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• Averaged transverse momentum correlations of hadrons in relativistic heavy-ion collisions
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