Journal
PHYSICAL REVIEW C
Volume 95, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.95.054911
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Funding
- National Science Center, Poland from the European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie Grant [Polonez DEC-2015/19/P/ST2/03333, 665778]
- National Science Center, Poland, under Maestro Grant [DEC-2013/10/A/ST2/00106]
- BMBF [06FY9092]
- ExtreMe Matter Institute (EMMI), DOE Grant [DE-AC02-98CH10886]
- Johannes Rattendahl foundation
- DOE Grant [DE-FG02-01ER41200]
- ExtreMe Matter Institute (EMMI)
- U.S. Department of Energy (DOE) [DE-FG02-01ER41200] Funding Source: U.S. Department of Energy (DOE)
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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 (root s(NN) = 200 GeV) and the Large Hadron Collider (root 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 pT distributions, the elliptic and triangular anisotropies are similar too, in both event-by-event and averaged initial state calculations.
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