Identified particles from viscous hydrodynamics

Abstract

Identified particle observables from viscous hydrodynamics are sensitive to the fluid-to-particle conversion. Instead of the commonly assumed "democratic" Grad ansatz for phase space corrections $\delta f$, we utilize corrections calculated from linearized covariant transport theory. Estimates based on a pion-proton system with binary collisions indicate that protons are much closer to equilibrium than pions, significantly affecting the dissipative reduction of differential elliptic flow in Au+Au at RHIC. In addition, we test linear response against fully nonlinear transport for a two-component massless system in a Bjorken scenario. Strikingly, we find that, while linear response accounts well for the dynamical sharing of shear stress, the momentum dependence of phase space corrections is best described by Grad's quadratic ansatz, and not the linear response solution.

Quark Matter 2011 contribution - 4 pages, uses IOP style files

References in corpus (2)

• Systematic parameter study of hadron spectra and elliptic flow from viscous hydrodynamic simulations of Au+Au collisions at sqrt(s_NN) = 200 GeV
• The applicability of causal dissipative hydrodynamics to relativistic heavy ion collisions

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• Hydrodynamics at RHIC and LHC: What have we learned?
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• Derivation of transient relativistic fluid dynamics from the Boltzmann equation for a multi-component system
• Flow harmonics within an analytically solvable viscous hydrodynamic model
• Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy
• Femtoscopy scales and particle production in the relativistic heavy ion collisions from Au+Au at 200 AGeV to Xe+Xe at 5.44 ATeV within the integrated hydrokinetic model
• Dissipative corrections to particle spectra and anisotropic flow from a saddle-point approximation to kinetic freeze out
• Flow harmonics from self-consistent particlization of a viscous fluid
• Spin Polarization of $\Lambda$ hyperons from Dissipative Spin Hydrodynamics
• Self-consistent Cooper-Frye freeze-out of a viscous fluid to particles