Systematic parameter study of hadron spectra and elliptic flow from viscous hydrodynamic simulations of Au+Au collisions at sqrt(s_NN) = 200 GeV

Abstract

Using the (2+1)-dimensional viscous hydrodynamic code VISH2+1, we present systematic studies of the dependence of pion and proton transverse momentum spectra and their elliptic flow in 200 A GeV Au+Au collisions on the parameters of the hydrodynamic model (thermalization time, initial entropy density distribution, decoupling temperature, equation of state, and specific shear viscosity eta/s). We identify a tension between the slope of the proton spectra, which (within hydrodynamic simulations that assume a constant shear viscosity to entropy density ratio) prefer larger eta/s values, and the slope of the p_T-dependence of charged hadron elliptic flow, which prefers smaller values of eta/s. Changing other model parameters does not appear to permit dissolution of this tension

14 pages, including 8 figures

References in corpus (18)

• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• The QCD Equation of State with almost Physical Quark Masses
• Equation of state and QCD transition at finite temperature
• On the Strongly-Interacting Low-Viscosity Matter Created in Relativistic Nuclear Collisions
• Suppression of elliptic flow in a minimally viscous quark-gluon plasma
• Hydrodynamic Models for Heavy Ion Collisions
• Multiplicity scaling in ideal and viscous hydrodynamics
• Dissipative Hydrodynamics and Heavy Ion Collisions
• Effects of fluctuations on the initial eccentricity from the Color Glass Condensate in heavy ion collisions
• The eccentricity in heavy-ion collisions from Color Glass Condensate initial conditions
• Resolving the HBT Puzzle in Relativistic Heavy Ion Collision
• Eccentricity fluctuation effects on elliptic flow in relativistic heavy ion collisions
• Initial condition for hydrodynamics, partonic free streaming, and the uniform description of soft observables at RHIC
• Importance of Granular Structure in the Initial Conditions for the Elliptic Flow
• Chemical freeze-out temperature in hydrodynamical description of Au+Au collisions at sqrt(s_NN) = 200 GeV
• Rapid hydrodynamic expansion in relativistic heavy-ion collisions
• Dynamical freeze-out condition in ultrarelativistic heavy ion collisions

Cited by in corpus (5)

• 200 A GeV Au+Au collisions serve a nearly perfect quark-gluon liquid
• Influence of the shear viscosity of the quark-gluon plasma on elliptic flow in ultrarelativistic heavy-ion collisions
• Elliptic Flow: A Brief Review
• Hadron spectra and elliptic flow for 200 A GeV Au+Au collisions from viscous hydrodynamics coupled to a Boltzmann cascade
• Directed flow at mid-rapidity in event-by-event hydrodynamics