Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 25: Physik mit schweren Ionen
HK 25.1: Gruppenbericht
Dienstag, 8. März 2005, 14:00–14:30, TU MA144
Thermalization of gluons at RHIC including gg<−>ggg interactions in a parton cascade — •Zhe Xu and Carsten Greiner — Robert-Mayer-Str. 8, 60325 Frankfurt
We develop a new 3+1 dimensional Monte Carlo cascade solving the kinetic on-shell Boltzmann equations for partons including the inelastic gg ↔ ggg pQCD processes, where the back reaction channel is treated fully consistently. The stochastic method is very efficient especially for high gluon interaction rates. The cascade is applied to simulate parton evolution and to investigate thermalization of gluons for a central Au+Au collision at RHIC energy. The initial conditions are assumed to be generated by independent minijets with pT > p0=1,3−2 GeV. It is demonstrated that overall kinetic equilibration is driven mainly by the inelastic processes and is achieved on a scale of 1−2 fm/c. The further evolution of the expanding gluonic matter then shows almost an ideal hydrodynamical behaviour. Full chemical equilibration of the gluons follows on a longer timescale of about 1−3 fm/c. Also results employing color glass condensate initial conditions will be presented.