Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 47: Heavy Ions V

HK 47.4: Talk

Thursday, March 11, 2004, 17:45–18:00, E

Kaon and pion production in heavy ion collisions at 2-40 AGeV — •Markus Wagner — Institut fuer Theoretische Physik, Univ Giessen Heinrich-Buff-Ring 16, D-35392 Giessen, Germany

One aim of heavy ion physics is to study the phase transition from the hadronic phase to the quark gluon plasma. It has been argued that an indication for such a transition should be an enhancement of strangeness production and in particular an enhancement in the K⁺/π⁺ ratio. Experiments indeed observe a peak in that ratio at about 30GeV beam energy. We study the production of strangeness within the BUU transport model based on hadronic and string degrees of freedom at energies from 2GeV to 40GeV. With standard parameters the model underpredicts the K⁺/π⁺ ratio at the peak. We analyse in detail the influence of the particle life times, formation times and off-shellness on the BUU results. We systematically compare the model to data from reactions with different system sizes with emphasis on the strangeness production mechanisms. We will also show and discuss the comparison to other models.