Dynamical freeze-out criterion in a hydrodynamical description of Au + Au collisions at sNN=200 GeV and Pb + Pb collisions at sNN=2760 GeV

2016/08/31 by Saeed Ahmad, Hannu Holopainen, Pasi Huovinen
Physics and Astronomy · #Constant (computer programming) #Event (particle physics) #High-Energy Particle Collisions Research #Knudsen number #Large Hadron Collider #Nuclear physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scattering #Thermodynamics #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.95.054911

published as Phys. Rev. C 95, 054911 (2017) · 11 pages, 11 figures, Version to appear in Physical Review C, typos corrected, a brief discussion about the centrality dependence and Gamow criterion added

arxiv created 2017/05/11 · openalex created_date 2017/05/19 · openalex publication_date 2017/05/19 · arxiv updated 2017/05/24 · openalex updated_date 2026/08/05

Abstract

In hydrodynamical modeling of ultrarelativistic heavy-ion collisions, the freeze-out is typically assumed to take place at a surface of constant temperature or energy density. A more physical approach is to assume that freeze-out takes place at a surface of constant Knudsen number. We evaluate the Knudsen number as a ratio of the expansion rate of the system to the pion-scattering rate and apply the constant Knudsen number freeze-out criterion to the ideal hydrodynamical description of heavy-ion collisions at the Relativistic Heavy Ion Collider at BNL (√s_NN=200 GeV) and the Large Hadron Collider (√s_NN=2760 GeV) energies. We see that once the numerical values of freeze-out temperature and freeze-out Knudsen number are chosen to produce similar p_T distributions, the elliptic and triangular anisotropies are similar too, in both event-by-event and averaged initial state calculations.

Citations

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