Directed Flow of Identified Particles in Au + Au Collisions at $\sqrt{s{_NN}} = 200$ GeV at RHIC

The collaboration
Phys.Rev.Lett. 108 (2012) 202301, 2012.

Abstract (data abstract)
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 $\sqrt{s_{NN}} = 200$ GeV are presented. A negative $v_1$(y) slope is observed for most of produced particles ($\pi^{\pm}$, $K^{\pm}$, $K_{S}^{0}$ and $\bar{p}$). In 5-30$\%$ central collisions a sizable difference is present between the $v_1$(y) slope of protons and antiprotons, with the former being consistent with zero within errors. 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. For those models which have calculations of $v_1$ for both pions and protons, none of them can describe $v_1$(y) for pions and protons simultaneously. The hydrodynamics model with a tilted source as currently implemented cannot explain the centrality dependence of the difference between the $v_1$(y) slopes of protons and antiprotons.

• #### Figure 1 (left)

Data from Figure 1 (left) for $\pi^{\pm}$ and $K_{S}^{0}$

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• #### Figure 1 (right)

Data from Figure 1 (right)

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• #### Figure 3

Data from Figure 3

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Charged pions (solid stars), protons (solid circles) and antiprotons (solid squares) $v_1$(y) slope (d$v_1$/dy) at midrapidity as a function of...

• #### Figure 4

Data from Figure 4

10.17182/hepdata.96905.v1/t6

Proton $v_1$($y^{\prime}$) slope (d$v_1$/d$y^{\prime}$) at midrapidity as a function of center of mass collision energy, where $y^{\prime} = y/y_{beam}$.

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