Flow harmonics from self-consistent particlization of a viscous fluid

Zack Wolff and Denes Molnar
Phys. Rev. C 96, 044909 – Published 23 October 2017

Abstract

The quantitative extraction of quark-gluon plasma (QGP) properties from heavy-ion data, such as its specific shear viscosity η/s, typically requires comparison to viscous hydrodynamic or “hybrid” hydrodynamics + transport simulations. In either case, one has to convert the fluid to hadrons, yet without additional theory input the conversion is ambiguous for dissipative fluids. Here, shear viscous phase-space corrections calculated using linearized transport theory are applied in Cooper-Frye freeze-out to quantify the effects on anisotropic flow coefficients vn(pT) at the energies available at both the BNL Relativistic Heavy Ion Collider and the CERN Large Hadron Collider. Expanding upon our previous flow harmonics studies [D. Molnar and Z. Wolff, Phys. Rev. C 95, 024903 (2017); Z. Wolff and D. Molnar, J. Phys.: Conf. Ser. 535, 012020 (2014)], we calculate pion and proton v2(pT), v4(pT), and v6(pT), but here we incorporate a hadron gas that is chemically frozen below a temperature of 175 MeV and use hypersurfaces from realistic viscous hydrodynamic simulations. For additive quark model cross sections and relative phase-space corrections with p3/2 momentum dependence rather than the quadratic Grad form, we find at moderately high transverse momentum noticeably higher v4(pT) and v6(pT) for protons than for pions. In addition, the value of η/s deduced from elliptic flow data differs by nearly 50% from the value extracted using the naive “democratic Grad” form of freeze-out distributions. To facilitate the use of the self-consistent viscous corrections calculated here in hydrodynamic and hybrid calculations, we also present convenient parametrizations of the corrections for the various hadron species.

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  • Received 11 January 2017
  • Revised 14 June 2017

DOI:https://doi.org/10.1103/PhysRevC.96.044909

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Zack Wolff and Denes Molnar

  • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA

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Issue

Vol. 96, Iss. 4 — October 2017

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