Systematic investigation of partonic collectivity through centrality dependence of elliptic flow of multi-strange hadrons in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV in STAR

Abstract

We present the measurement of centrality dependence of multi-strange hadron ($\Omega$, $\Xi$ and $\varphi$) elliptic flow ($v_2$) at mid-rapidity in Au+Au collision at $\sqrt{s_{NN}}$ = 200 GeV. We investigate number-of-constituents quark (NCQ) scaling of identified hadrons $v_2$ for different collision centralities. Maximum deviation from ideal NCQ scaling observed at the level of 10% for centrality 30-80 at $(m_T-m_0)/n_q$ $>$ 0.6 GeV/$c^2$. This may indicate smaller contribution to the collectivity from the partonic phase in the peripheral collisions. We also observe the mass ordering of $v_2$ break down between proton and $\varphi$-meson for $p_T$ $<$1 GeV/$c$. This could be due to the effect of later stage hadronic interactions on $v_2$.

4 pages, 3 figures, Quark Matter 2012 proceedings

References in corpus (4)

• Centrality dependence of charged hadron and strange hadron elliptic flow from sqrt(s_NN) = 200 GeV Au+Au collisions
• Partonic flow and $\varphi$-meson production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Mass ordering of differential elliptic flow and its violation for phi mesons
• Azimuthally sensitive correlations in nucleus-nucleus collisions

Cited by in corpus (5)

• Integrated Dynamical Approach to Relativistic Heavy Ion Collisions
• Spectra and elliptic flow for identified hadrons in 2.76 A TeV Pb+Pb collisions
• Effects of hadronic rescattering on multistrange hadrons in high-energy nuclear collisions
• New State of Nuclear Matter: Nearly Perfect Fluid of Quarks and Gluons in Heavy Ion Collisions at RHIC Energies
• Violation of mass ordering for multi-strange hadrons at RHIC and LHC