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The Boltzmann-Uehling-Uhlenbeck (BUU) transport model is applied to study strangeness and pion production in nucleus-nucleus collisions. Starting from proton induced reactions, we further investigate Si+Au,Au+Au, and Pb+Pb collisions in the energy range between 2 and 40A0.3em0exGeV and compare the results with data and other transport calculations. The qq̄-annihilation, or resonance, channel simulated by the string model in meson-nucleon collisions at √s>20.3em0exGeV is introduced. The importance of this channel for a good description of the proton-nucleus data on K⁺ production is demonstrated. We further show that meson-meson collisions contribute significantly to the KK production in heavy-ion collisions above 5A0.3em0exGeV and improve the agreement with data on the K⁺/π⁺ ratio. Finally, we study the influence of in-medium modifications of the FRITIOF model on pion and kaon production.
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Wagner et al. (2005) studied this question.
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