$\Omega$ and $\varphi$ in Au + Au ~collisions at \srt~= 200 and 11.5 GeV from a multiphase transport model

Abstract

Within the framework of a multiphase transport model, we study the production and properties of $\Omega$ and $\varphi$ in Au + Au collisions with a new set of parameters for $\sqrt{s_{NN}}$ = 200 GeV and with the original set of parameters for $\sqrt{s_{NN}}$ = 11.5 GeV, respectively. The AMPT model with the string melting version provides a reasonable description at $\sqrt{s_{NN}}$ = 200 GeV and while the AMPT model with default version describes the data well at $\sqrt{s_{NN}}$ = 11.5 GeV. It indicates that the system created at top RHIC energy is dominated by partonic interaction and while the hadronic interaction becomes important at lower beam energy, such as $\sqrt{s_{NN}}$ = 11.5 GeV. The comparison of $N({\Omega }^{+}+{\Omega }^{-})/[2N(\varphi )]$ ratio between data and calculations further supports the argument. Our calculations can generally describe the data of nuclear modification factor as well as elliptic flow.

7 pages, 6 figures; Chinese Physics C (in press)

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Cited by in corpus (2)

• Enhanced production of strange baryons in high energy nuclear collisions from a multiphase transport model
• System size dependence of baryon-strangeness correlations in relativistic heavy ion collisions from a multiphase transport model