Aug 12 – 18, 2012
US/Eastern timezone

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STAR measurements of centrality dependence of elliptic flow for identified hadrons in Au + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

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

Regency 1/3 and Ambassador

Poster Global and collective dynamics Poster Session Reception


Dr Hiroshi Masui (LBNL)


Elliptic flow $v_2$ is one of the key observables to study the bulk properties at freeze-out as well as hadron production mechanisms in the ultra relativistic heavy ion collisions. It has been observed that number of constituent quark (NCQ) scaling of $v_2$ holds among measured identified hadrons at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV in Au + Au collisions at RHIC. The scaling of $v_2$ strongly indicates that the collectivity develops at the stage where the partonic degrees of freedom are relevant. Studying the NCQ scaling of $v_2$ as a function of transverse momentum $p_T$ and centrality will shed light on the production mechanisms for hadrons in heavy ion collisions. We present the results of $v_2$ as a function of $p_T$ for identified $\pi^{\pm}$, $K^{\pm}$, $K^0_S$, $p$, $\bar{p}$, $\Lambda$ and $\bar{\Lambda}$ in Au + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The NCQ scaling of $v_2$ in several different centrality classes is discussed.

Primary author

Dr Hiroshi Masui (LBNL)

Presentation materials