Pre-equilibrium evolution effects on heavy-ion collision observables

Liu, Jia; Shen, Chun; Heinz, Ulrich

doi:10.1103/PhysRevC.91.064906

Title: Pre-equilibrium evolution effects on heavy-ion collision observables

Journal Article · Mon Jun 08 00:00:00 EDT 2015 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.91.064906· OSTI ID:1604531

Liu, Jia ^[1]; Shen, Chun ^[2];

^[1]

The Ohio State Univ., Columbus, OH (United States)
The Ohio State Univ., Columbus, OH (United States); McGill Univ., Montreal, QC (Canada)

To investigate the importance of pre-equilibrium dynamics on relativistic heavy-ion collision observables, we match a highly nonequilibrium early evolution stage, modeled by free-streaming partons generated from the Monte Carlo Kharzeev-Levin-Nardi (MC-KLN) and Monte Carlo Glauber (MC-Glb) models, to a locally approximately thermalized later evolution stage described by viscous hydrodynamics and study the dependence of final hadronic transverse momentum distributions, in particular their underlying radial and anisotropic flows, on the switching time between these stages. Performing a three-parameter fit of the measured values for the average transverse momenta p_⊥ for pions, kaons, and protons, as well as the elliptic and triangular flows of charged hadrons $$v^{ch}_{2,3}$$, with the switching time τ_s, the specific shear viscosity η/s during the hydrodynamic stage, and the kinetic decoupling temperature T_dec as free parameters, we find that the preferred “thermalization” times τ_s depend strongly on the model of the initial conditions. MC-KLN initial conditions require an earlier transition to hydrodynamic behavior (at τ_s ≈ 0.13 fm/c), followed by hydrodynamic evolution with a larger specific shear viscosity η/s ≈ 0.2, than MC-Glb initial conditions, which prefer switching at a later time (τ_s ≈ 0.6 fm/c) followed by a less viscous hydrodynamic evolution with η/s ≈ 0.16. Finally, these new results including pre-equilibrium evolution are compared to fits without a pre-equilibrium stage where all dynamic evolution before the onset of hydrodynamic behavior is ignored. In each case, the quality of the dynamical descriptions for the optimized parameter sets, as well as the observables which show the strongest constraining power for the thermalization time, are discussed.

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Research Organization:: The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0004286; SC0004104

OSTI ID:: 1604531

Alternate ID(s):: OSTI ID: 1184056

Journal Information:: Physical Review C, Nuclear Physics, Vol. 91, Issue 6; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 53 works

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