Event anisotropy $v_2$ in Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7 - 62.4 GeV with STAR

Abstract

We present the $v_2$ measurement at midrapidity from Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7, 11.5, 19.6, 27, 39 and 62.4 GeV for inclusive charged hadrons and identified hadrons (${\pi }^{\pm }$, $K^{\pm }$, $K_S^0$, $p$, $\bar{p}$, $\varphi$, $\Lambda$, $\bar{\Lambda }$, ${\Xi }^{-}$, ${\bar{\Xi }}^{+}$, ${\Omega }^{-}$, ${\bar{\Omega }}^{+}$) up to 4 GeV/$c$ in $p_T$. The beam energy and centrality dependence of charged hadron $v_2$ are presented with comparison to higher energies at RHIC and LHC. The identified hadron $v_2$ are used to discuss the NCQ scaling for different beam energies. Significant difference in $v_2(p_T)$ is observed between particles and corresponding anti-particles for $\sqrt{s_{NN}}<$ 39 GeV. These differences are more pronounced for baryons compared to mesons and they increase with decreasing energy.

4 pages, 3 figures, Quark Matter 2012 proceedings

References in corpus (6)

• Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV
• Flow analysis with cumulants: direct calculations
• Inclusive charged hadron elliptic flow in Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7 - 39 GeV
• Constituent quark scaling violation due to baryon number transport
• Collective phenomena in non-central nuclear collisions
• Effects of hadronic potentials on elliptic flows in relativistic heavy ion collisions

Cited by in corpus (4)

• A Study of the Properties of the QCD Phase Diagram in High-Energy Nuclear Collisions
• How much does the hadronic phase contribute to the observed anisotropic flow at the LHC?
• Transport-model investigation of scaling of the number of constituent quarks and the hadronic-partonic transition in Au + Au collisions
• Violation of NCQ scaling in hadron elliptic flow in Au+Au collisions at $\sqrt{s_{NN}}=3.0-7.7GeV