# Partonic flow and $\phi$-meson production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

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 $p_{T}\sim 4$ 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00137889
Contributor : Dominique Girod <>
Submitted on : Thursday, March 22, 2007 - 2:22:57 PM
Last modification on : Tuesday, May 4, 2021 - 11:26:08 AM

### Citation

B.I. Abelev, M.M. Aggarwal, Z. Ahammed, B.D. Anderson, D. Arkhipkin, et al.. Partonic flow and $\phi$-meson production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Physical Review Letters, American Physical Society, 2007, 99, pp.112301. ⟨10.1103/PhysRevLett.99.112301⟩. ⟨in2p3-00137889⟩

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