Aug 12 – 18, 2012
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Observation of a difference in $v_{2}$ between particles and anti-particles in Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7-62.4 GeV with STAR

Aug 16, 2012, 4:00 PM
Regency 1/3 and Ambassador

Regency 1/3 and Ambassador

Poster Global and collective dynamics Poster Session Reception


Alexander Schmah (Lawrence Berkeley National Lab)


The RHIC Beam Energy Scan covers a wide range in the QCD phase diagram temperature vs. baryon chemical potential. A phase transition between the Quark Gluon Plasma and the hadron gas phase is expected in this region of the QCD phase diagram. The elliptic flow $v_{2}$ is one of the observables which is sensitive to the pressure gradients in the initial stage of heavy-ion collisions. Hence it can provide important information about the properties of the fireball in the early stage of heavy ion collisions. Elliptic flow measurements at midrapidity from Au+Au collisions at \\ $\sqrt{s_{NN}}=$ 7.7, 11.5, 19.6, 27, 39 and 62.4 GeV for identified hadrons ($\pi^{\pm}$,$K^{\pm}$, K$_{s}^{0}$, $p$, $\bar{p}$, $\phi$, $\Lambda$, $\bar{\Lambda}$, $\Xi^{-}$,$\bar{\Xi}^{+}$, $\Omega^{-}$, $\bar{\Omega}^{+}$) are presented. We observe a significant difference in $v_{2}$ between particles and corresponding anti-particles at the lowest energies of the beam energy scan. Baryons show a larger difference compared to mesons. The centrality, particle species and energy dependence of the difference will be presented. Furthermore we compare the data to several models and discuss their implications.

Primary author

Alexander Schmah (Lawrence Berkeley National Lab)

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