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arXiv · 1207.2791

Hydrodynamics at large baryon densities: Understanding proton vs. anti-proton v_2 and other puzzles

J. Steinheimer·V. Koch·M. Bleicher
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Abstract

We study the importance of the initial state, baryon stopping and baryon number transport for the dynamical evolution of a strongly interacting system produced in heavy ion collisions. We employ a hybrid model, which combines the fluid dynamical evolution of the fireball with a transport treatment for the initial state and the final hadronic phase. We present results for collisions at beam energies from sqrt{s_{NN}}=7.7 to 200 GeV. We study various observables such as the centrality dependent freeze out parameters, the non-monotonic behavior of effective slope parameter parameter with particle mass as well as the apparent difference in particle and anti-particle elliptic flow. Our results are in reasonable agreement with the available data. We find that the propagation of the baryon-number current in the hydrodynamic evolution as well as the transport treatment of the hadronic phase are essential for reproducing the experimental data.

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J. Steinheimer, V. Koch, M. Bleicher. 2012-10-15. Hydrodynamics at large baryon densities: Understanding proton vs. anti-proton v_2 and other puzzles. https://doi.org/10.1103/physrevc.86.044903

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