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Transverse Pressure and Strangeness Dynamics in Relativistic Heavy Ion Reactions

M. Bleicher·E. Bratkovskaya·S. Vogel·X. Zhu
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Abstract

Transverse hadron spectra from proton-proton, proton-nucleus and nucleus-nucleus collisions from 2 AGeV to 21.3 ATeV are investigated within two independent transport approaches (HSD and UrQMD). For central Au+Au (Pb+Pb) collisions at energies above $E_{\rm lab}\sim$ 5 AGeV, the measured $K^{\pm}$ transverse mass spectra have a larger inverse slope parameter than expected from the default calculations. The additional pressure - as suggested by lattice QCD calculations at finite quark chemical potential $μ_q$ and temperature $T$ - might be generated by strong interactions in the early pre-hadronic/partonic phase of central Au+Au (Pb+Pb) collisions. This is supported by a non-monotonic energy dependence of $v_2/< p_T>$ in the present transport model.

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M. Bleicher, E. Bratkovskaya, S. Vogel, X. Zhu. 2005-03-24. Transverse Pressure and Strangeness Dynamics in Relativistic Heavy Ion Reactions. https://doi.org/10.1088/0954-3899%2F31%2F6%2F011

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