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arXiv · 1004.4555

Directed Flow of Identified Particles in Au + Au Collisions at $\sqrtsNN = 200$ GeV

Aihong Tang
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Abstract

STAR's measurements of directed flow ($v_1$) for pions, kaons (charged and $K_s^0$), protons and antiprotons for Au + Au collisions at $\sqrtsNN = 200$ GeV are presented. Negative $v_1(y)$ slope is observed for pions, antiprotons, protons and kaons. The proton $v_1(y)$ slope at midrapidity is found extremely small. Sizable difference is seen between $v_1$ 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 $v_1(y)$ slopes of protons and anti-protons. The $v_1$ 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.

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Aihong Tang. 2010-04-26. Directed Flow of Identified Particles in Au + Au Collisions at $\sqrtsNN = 200$ GeV. https://doi.org/10.1088/1742-6596%2F230%2F1%2F012018

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