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HK: Fachverband Hadronen und Kerne

HK 79: Heavy Ion Collisions and QCD phases

HK 79.1: Group Report

Friday, March 20, 2009, 11:00–11:30, H-ZO 10

Dynamic parton rearrangement within the UrQMD transport approach — •Gunnar Gräf, Hannah Petersen, Gerhard Burau, and Marcus Bleicher — Institut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main

We have implemented a mechanism for locally density-dependent dynamic parton rearrangement and fusion into the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) approach. The same mechanism has been previously built in the Quark Gluon String Model (QGSM) [1, 2]. This rearrangement and fusion approach based on parton coalescence ideas enables the description of multi-particle interactions, namely 3 → 3 and 3 → 2, between (pre-)hadronic states in addition to standard binary interactions. The UrQMD model (v2.3) [3, 4] extended by these additional processes allows now to investigate the implications of multi-particle interactions on the reaction dynamics of ultra-relativistic heavy-ion collisions. We will present first results of this investigation, e.g. implications on the kinetic equilibration time due to the change of the mean free path and on measurable observables like spectra of final hadrons. (This work is supported by GSI and the Helmholtz International Center for FAIR within the framework of the LOEWE program launched by the State of Hesse.)

[1] J. Bleibel et al., Phys. Rev. C 76 (2007) 024912.

[2] J. Bleibel et al., Phys. Lett. B 659 (2008) 520.

[3] S. A. Bass et al., Prog. Part. Nucl. Phys. 41 (1998) 255.

[4] M. Bleicher et al., J. Phys. G 25 (1999) 1859.