Centrality and system size dependence of φ meson production at RHIC

Abstract

We study the centrality and system size dependence of φ meson production by reproducing its transverse-momentum distributions and mid-rapidity distributions (dN/dy) for various collision systems of Au+Au, Cu+Cu, d+Au and p+p at various RHIC energies of , 130 GeV and 200 GeV by using Unified Statistical Thermal Freeze-out Model (USTFM). The calculated results are found to be in good agreement with the experimental data points taken from the STAR experiment. Freeze-out conditions in terms of transverse flow velocity and thermal freeze-out temperature are extracted from the fits of transverse-momentum spectra of the particles at different centrality classes and for different collision systems. The transverse size of the system in terms of transverse-radius parameter is determined from the fits of rapidity distributions at various centrality classes and for various collision systems.