System Size Dependence of $\phi $-meson Production at RHIC

The results on $\phi $-meson production in Au+Au collisions and comparison to model calculation indicate that the $\phi $ mesons are produced by coalescence of thermalized s-quarks in central collisions. The observation of $\phi $-meson elliptic flow in non-central collisions and its magnitude at intermediate p$_{T}$ being similar to other mesons has been considered as a clear signature of partonic collectivity at RHIC [1]. The Cu+Cu collisions provide a tool to probe the system size dependence of the $\phi $-meson production and collision dynamics at RHIC. In this talk we will present the STAR preliminary results on the $\phi $-meson production in Cu+Cu collisions at both 62.4 and 200 GeV from the STAR Collaboration. The transverse mass spectra, particle ratios, the strangeness enhancement and elliptic flow of $\phi $-mesons will be compared with the results from the Au+Au collisions at same beam energy in order to understand the system size dependence of $\phi $-meson production in high-energy collisions at RHIC.