Partonic flow and phi-meson production in Au + Au collisions at s(NN)**(1/2) = 200-GeV

The STAR collaboration
Phys.Rev.Lett. 99 (2007) 112301, 2007.

Abstract (data abstract)
We present first measurements of the $\phi$-meson elliptic flow ($v_{2}$($p_{T}$)) and high statistics $p_{T}$ distributions for different centralities from $\sqrt{s_{NN}}$= 200 GeV Au+Au collisions at RHIC. In minimum bias collisions the $v_{2}$ of the $\phi$ meson is consistent with the trend observed for mesons. The ratio of the yields of the $\Omega$ to those of the $\phi$ as a function of transverse momentum is consistent with a model based on the recombination of thermal $s$ quarks up to $p_{T}$∼4 GeV/c, but disagrees at higher momenta. The nuclear modification factor ($R_{CP}$) of $\phi$ follows the trend observed in the $K^{0}_{S}$ mesons rather than in $\Lambda$ baryons, supporting baryon-meson scaling. Since $\phi$-mesons are made via coalescence of seemingly thermalized s quarks in central Au+Au collisions, the observations imply hot and dense matter with partonic collectivity has been formed at RHIC.

  • Figure 1 top

    Data from Figure 1 top


    The elliptic flow, $v_{2}$($p_{T}$), for the $\phi$-meson as a function of centrality. The vertical error bars represent the statistical errors...

  • Figure 2

    Data from Figure 2


    (color online) Transverse momentum distributions of $\phi$-mesons from Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. For clarity, distributions for different...

  • Figure 3

    Data from Figure 3


    (color online) The $N(\Omega)/N(\phi)$ ratio vs. $p_{T}$ for three centrality bins in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions. The solid...

  • Figure 4 top

    Data from Figure 4 top


    (color online) The $R_{CP}$ of mid-rapidity $\phi$-mesons produced in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions: (top) 0-5% vs. 40-60% and...

  • Figure 4 bottom

    Data from Figure 4 bottom


    (color online) The $R_{CP}$ of mid-rapidity $\phi$-mesons produced in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions: (top) 0-5% vs. 40-60% and...

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