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

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 (${\pi }^{\pm }$, $K^{\pm }$, $K_S^0$, $p$, $\bar{p}$, $\varphi$, $\mathrm{\Lambda }$, $\bar{\mathrm{\Lambda }}$, ${\mathrm{\Xi }}^{-}$, ${\bar{\mathrm{\Xi }}}^{+}$, ${\mathrm{\Omega }}^{-}$, ${\bar{\mathrm{\Omega }}}^{+}$) 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.