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arXiv · 1206.2246

Directed flow of transported and non-transported protons in Au+Au collisions from UrQMD model

Yao Guo·Feng Liu·Aihong Tang
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Abstract

The directed flow of inclusive, transported and non-transported (including produced) protons, as well as antiprotons, has been studied in the framework of Ultra-Relativistic Quantum Molecular Dynamics approach (UrQMD model) for Au+Au collisions at\surdsNN =7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV. The rapidity, centrality and energy dependence of directed flow for various proton groups are presented. It is found that the integrated directed flow decreases monotonically as a function of collision energy for\surdsNN =11.5 GeV and beyond. However, the sign-change of directed flow of inclusive protons, seen in experimental data as a function of centrality and collision energy, can be explained by the competing effect of directed flow between transported and non-transported protons. Similarly the difference in directed flow between protons and antiprotons can be explained. Our study offers a conventional explanation on the cause of the v1 sign-change other than the antiflow component of protons alone which is argued to be linked to a phase transition.

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Yao Guo, Feng Liu, Aihong Tang. 2012-06-11. Directed flow of transported and non-transported protons in Au+Au collisions from UrQMD model. https://doi.org/10.1103/physrevc.86.044901

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