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      Dynamical freeze-out condition in ultrarelativistic heavy ion collisions

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          Abstract

          We determine the decoupling surfaces for the hydrodynamic description of heavy ion collisions at RHIC and LHC by comparing the local hydrodynamic expansion rate with the microscopic pion-pion scattering rate. The pion \(p_T\) spectra for nuclear collisions at RHIC and LHC are computed by applying the Cooper-Frye procedure on the dynamical-decoupling surfaces, and compared with those obtained from the constant-temperature freeze-out surfaces. Comparison with RHIC data shows that the system indeed decouples when the expansion rate becomes comparable with the pion scattering rate. The dynamical decoupling based on the rates comparison also suggests that the effective decoupling temperature in central heavy ion collisions remains practically unchanged from RHIC to LHC.

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          Author and article information

          Journal
          24 October 2007
          Article
          10.1103/PhysRevC.77.044907
          0710.4476
          Custom metadata
          Phys.Rev.C77:044907,2008
          7 pages, 9 figures
          hep-ph nucl-th

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