An explanation of the elliptic flow difference between proton and anti-proton from the UrQMD model with hadron potentials

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• 作者：QingFeng Li ; YongJia Wang ; XiaoBao Wang…
• 关键词：elliptic flow difference ; UrQMD ; mean field potential ; annihilation process
• 刊名：SCIENCE CHINA Physics, Mechanics & Astronomy
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：59
• 期：3
• 全文大小：584 KB
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• 作者单位：QingFeng Li (1)
  YongJia Wang (1)
  XiaoBao Wang (1)
  CaiWan Shen (1)
  
  1. School of Science, Huzhou University, Huzhou, 313000, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  Mechanics, Fluids and Thermodynamics
  Physics
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1927

文摘

The time evolution of both proton and anti-proton v ₂ flows from Au+Au collisions at \(\sqrt {{S_{NN}}} = 7.7\) GeV are examined by using both pure cascade and mean-field potential versions of the UrQMD model. Due to a stronger repulsion at the early stage introduced by the repulsive potentials and hence much less annihilation probabilities, anti-protons are frozen out earlier with smaller v ₂ values. Therefore, the experimental data of anti-proton v ₂ as well as the flow difference between proton and anti-proton can be reasonably described with the potential version of UrQMD. Keywords elliptic flow difference UrQMD mean field potential annihilation process