Directed flow of identified particles in Au + Au collisions at = 200 GeV
Directed flow of identified particles in Au + Au collisions at = 200 GeV
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DOI：
10.1088/1742-6596/230/1/012018
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发表时间：
2010-04
期刊：
影响因子：
--
通讯作者：
A. Tang
中科院分区：
文献类型：
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作者：
A. Tang
STAR's measurements of directed flow (v1) for pions, kaons (charged and K0s), protons and antiprotons for Au + Au collisions at = 200 GeV are presented. Negative v1(y) slope is observed for pions, antiprotons, protons and kaons. The proton v1(y) slope at midrapidity is found extremely small. Sizable difference is seen between v1 of protons and anti-protons in 5–30% central collisions. Anti-flow can explain the negative slope, however, it has difficulties explaining the centrality dependence of the difference between the v1(y) slopes of protons and anti-protons. The v1 excitation function is presented. Comparisons to model calculations (RQMD, uRQMD, AMPT and QGSM) are made, and it is found that none of the four models can successfully describe the data.
