2007/10/31 by P. Huovinen, Pasi Huovinen · 4 citations
Physics and Astronomy · #Dust and Plasma Wave Phenomena #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1140/epja/i2007-10611-3
published as Eur.Phys.J.A37:121-128,2008 · 8 pages, 7 figures; Accepted for publication in European Physical Journal A; Added discussion about the effect of weak decays to chemical freeze-out temperature and a figure showing isentropic curves in T-mu plane
arxiv created 2008/06/19 · openalex publication_date 2008/07/01 · arxiv updated 2009/12/01 · openalex created_date 2019/07/23 · openalex updated_date 2026/07/29
We study the effect of separate chemical and kinetic freeze-outs to the ideal hydrodynamical flow in Au+Au collisions at RHIC (sqrt(sNN) = 200 GeV energy). Unlike in earlier studies we explore how these effects can be counteracted by changes in the initial state of the hydrodynamical evolution. We conclude that the reproduction of pion, proton and antiproton yields necessitates a chemical freeze-out temperature of T = 150 MeV instead of T = 160 - 170 MeV motivated by thermal models. Unlike previously reported, this lower temperature makes it possible to reproduce the pT-spectra of hadrons if one assumes very small initial time, tau0 = 0.2 fm/c. However, the pT-differential elliptic flow, v2(pT) remains badly reproduced. This points to the need to include dissipative effects (viscosity) or some other refinement to the model.