Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 11: Physik mit schweren Ionen

HK 11.1: Gruppenbericht

Freitag, 4. März 2005, 16:30–17:00, TU MA042

Kaon and pion production in heavy-ion collisions at 1-40 A GeV — •Alexei Larionov, Ulrich Mosel, and Markus Wagner — Institut für Theoretische Physik, Universität Giessen, Germany

We present transport calculations of heavy-ion collisions at SIS, AGS and lower SPS energies basing on the BUU model [1]. At SIS energies we study an influence of the K⁺ mean field potential on the phase space distributions of kaons. To describe the data on the in-plane flow, a strong repulsive K⁺ potential (+30 MeV at ρ=ρ₀) is needed in order to compensate an effect of the Lorentz force caused by the space component of the kaon vector field, in agreement with [2]. We show that also the K⁺ azimuthal distribution is well described using the same potential. At AGS and SPS energies we introduce the new meson-meson channels of the K K production which leads to the enhancement of the K⁺/π⁺ ratio in central Au+Au and Pb+Pb collisions in a better agreement with data. We also propose a simple method to take into account the in-medium (Dirac) masses of incoming and outgoing particles in FRITIOF events and study an influence of this effect on particle production. Supported by GSI Darmstadt.

[1] M. Effenberger, E.L. Bratkovskaya, and U. Mosel, Phys. Rev. C 60, 44614 (1999); M. Effenberger, PhD thesis, Uni. Giessen, 1999, http://theorie.physik.uni-giessen.de/html/dissertations.html.

[2] Y.-M. Zheng, C. Fuchs, A. Faessler, K. Shekhter, Y.-P. Yan and C. Kobdaj, Phys. Rev. C 69, 034907 (2004).