Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2011-12-16
Physics
Nuclear Physics
Nuclear Experiment
4 figures. Submitted to PRL
Scientific paper
STAR's measurements of directed flow ($v_1$) around midrapidity for $\pi^{\pm}$, K$^{\pm}$, K$_S^0$, $p$ and $\bar{p}$ in Au + Au collisions at $\sqrtsNN = 200$ GeV are presented. A negative $v_1(y)$ slope is observed for most of produced particles ($\pi^{\pm}$, K$^{\pm}$, K$_{S}^{0}$ and $\bar{p}$). The proton $v_1(y)$ slope is found to be much closer to zero compared to antiprotons. A sizable difference is seen between $v_1$ of protons and antiprotons in 5-30% central collisions. The $v_1$ excitation function is presented. Comparisons to model calculations (RQMD, UrQMD, AMPT, QGSM with parton recombination, and a hydrodynamics model with a tilted source) are made. Anti-flow alone cannot explain the centrality dependence of the difference between the $v_1(y)$ slopes of protons and antiprotons.
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