$\varphi$ meson production in $\sqrt{s_{NN}}$ = 200 GeV Au+Au and pp collisions at RHIC

We present the results for the measurement of $\varphi$ meson production in $\sqrt{s_{NN}}$ = 200 GeV Au+Au and pp collisions at the Relativistic Heavy Ion Collider (RHIC). Using the event mixing technique, spectra and yields are obtained from the $\varphi \to K^{+}{K}^{-}$ decay channel for different centrality bins in Au+Au collisions and in pp collisions. We observe that the spectrum shape in Au+Au collisions depends weakly on the centrality and the shape of the spectrum in pp collisions is significantly different from that in Au+Au collisions. In Au+Au collisions, the extracted yield of $\varphi$ meson is flat as a function of rapidity; The $<p_T>$ of $\varphi$, extracted from the fit function to the spectra, shows a different behavior as a function of centrality than that of ${\pi }^{-}$, $K^{-}$ and $\bar{p}$