Pre-equilibrium dynamics and heavy-ion observables

Heinz, Ulrich; Liu, Jia

doi:10.1016/j.nuclphysa.2016.01.065

Title: Pre-equilibrium dynamics and heavy-ion observables

Abstract

To bracket the importance of the pre-equilibrium stage on relativistic heavy-ion collision observables, we compare simulations where it is modeled by either free-streaming partons or fluid dynamics. These cases implement the assumptions of extremely weak vs. extremely strong coupling in the initial collision stage. Accounting for flow generated in the pre-equilibrium stage, we study the sensitivity of radial, elliptic and triangular flow on the switching time when the hydrodynamic description becomes valid. Using the hybrid code iEBE-VISHNU [1] we perform a multi-parameter search, constrained by particle ratios, integrated elliptic and triangular charged hadron flow, the mean transverse momenta of pions, kaons and protons, and the second moment of the proton transverse momentum spectrum, to identify optimized values for the switching time \tau_s from pre-equilibrium to hydrodynamics, the specific shear viscosity eta/s, the normalization factor of the temperature-dependent specific bulk viscosity (zeta/s)(T), and the switching temperature T_sw from viscous hydrodynamics to the hadron cascade UrQMD. With the optimized parameters, we predict and compare with experiment the p_T -distributions of pi, K, p, Lambda, Xi and Omega yields and their elliptic flow coefficients, focusing specifically on the mass-ordering of the elliptic flow for protons and Lambda hyperons which is incorrectly described bymore » VISHNU without pre-equilibrium flow.« less

Authors:

^[1]; Liu, Jia ^[1]

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

Publication Date:: Wed Oct 05 00:00:00 EDT 2016

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

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

OSTI Identifier:: 1604414

Alternate Identifier(s):: OSTI ID: 1550693

Grant/Contract Number:: SC0004286

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Physics. A

Additional Journal Information:: Journal Volume: 956; Journal Issue: C; Journal ID: ISSN 0375-9474

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; collective flow; pre-equilibrium dynamics; quark-gluon plasma; viscosity; model-to-data comparison; parameter optimization; uncertainty quantification

Citation Formats


                    Heinz, Ulrich, and Liu, Jia. Pre-equilibrium dynamics and heavy-ion observables.  United States: N. p., 2016. 
Web.  doi:10.1016/j.nuclphysa.2016.01.065.

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                    Heinz, Ulrich, & Liu, Jia. Pre-equilibrium dynamics and heavy-ion observables.  United States.  https://doi.org/10.1016/j.nuclphysa.2016.01.065

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                    Heinz, Ulrich, and Liu, Jia. Wed .  
"Pre-equilibrium dynamics and heavy-ion observables".  United States.  https://doi.org/10.1016/j.nuclphysa.2016.01.065.  https://www.osti.gov/servlets/purl/1604414.

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@article{osti_1604414,

  title        = {Pre-equilibrium dynamics and heavy-ion observables},

  author       = {Heinz, Ulrich and Liu, Jia},

  abstractNote = {To bracket the importance of the pre-equilibrium stage on relativistic heavy-ion collision observables, we compare simulations where it is modeled by either free-streaming partons or fluid dynamics. These cases implement the assumptions of extremely weak vs. extremely strong coupling in the initial collision stage. Accounting for flow generated in the pre-equilibrium stage, we study the sensitivity of radial, elliptic and triangular flow on the switching time when the hydrodynamic description becomes valid. Using the hybrid code iEBE-VISHNU [1] we perform a multi-parameter search, constrained by particle ratios, integrated elliptic and triangular charged hadron flow, the mean transverse momenta of pions, kaons and protons, and the second moment of the proton transverse momentum spectrum, to identify optimized values for the switching time \tau_s from pre-equilibrium to hydrodynamics, the specific shear viscosity eta/s, the normalization factor of the temperature-dependent specific bulk viscosity (zeta/s)(T), and the switching temperature T_sw from viscous hydrodynamics to the hadron cascade UrQMD. With the optimized parameters, we predict and compare with experiment the p_T -distributions of pi, K, p, Lambda, Xi and Omega yields and their elliptic flow coefficients, focusing specifically on the mass-ordering of the elliptic flow for protons and Lambda hyperons which is incorrectly described by VISHNU without pre-equilibrium flow.},

  doi          = {10.1016/j.nuclphysa.2016.01.065},

  journal      = {Nuclear Physics. A},

  number       = C,

  volume       = 956,

  place        = {United States},

  year         = {Wed Oct 05 00:00:00 EDT 2016},

  month        = {Wed Oct 05 00:00:00 EDT 2016}

}

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Title: Pre-equilibrium dynamics and heavy-ion observables

Abstract

Citation Formats

Effect of bulk viscosity on elliptic flow near the QCD phase transition journal, December 2009

Fully Dynamical Simulation of Central Nuclear Collisions journal, November 2013

Hybrid model approach for strange and multistrange hadrons in 2.76 A TeV Pb + Pb collisions journal, March 2015

Bulk viscosity, particle spectra, and flow in heavy-ion collisions journal, April 2012

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Hybrid model approach for strange and multistrange hadrons in $2.76 A$ TeV $Pb + Pb$ collisions
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