### Non-equilibrium approaches to the pre-thermal and post-hadronisation stages of A+A collisionsNon-equilibrium approaches to the pre-thermal and post-hadronisation stages of A+A collisions

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 Author Sinyukov, Yu M. ♦ Karpenko, Iu A. Source arXiv.org Content type Text File Format PDF Date of Submission 2009-11-23 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics Subject Keyword Nuclear Theory ♦ physics:nucl-th Abstract The results related to non-equilibrium phenomena at the very early and late stages of the processes of A+A collisions are presented. A good description of the hadron momentum spectra as well as pion and kaon interferometry data at RHIC is reached within the realistic dynamical picture of A+A collisions: HydroKinetic Model (HKM). The model accumulates the following features: not too early thermalization time; $\tau\geq 1$ fm/c; a developing of the pre-thermal transverse flows; the effectively more hard, than in the case of chemical equilibrium, equation of state of expanding chemically non-equilibrated multi-hadronic gas; a continuous non-equilibrated emission of hadrons. All these factors lead to a good description of the mentioned RHIC data, in particular, the observed $R_{out}/R_{side}$ ratios, solving, therefore, the HBT puzzle in detailed realistic model. Description Reference: Nonlin.Phenom.Complex Syst.12:496-502,2009 Educational Use Research Learning Resource Type Article Page Count 10