$K^{*}(892)$ Production in Au+Au and pp Collisions at $\sqrt{s_{NN}}$ = 200GeV at STAR

Abstract

Mid-rapidity $K^{*0}(892)\to Kπ$ and $K^{*\pm}(892)\to K_S^0π^{\pm}$ are measured in Au+Au and pp collisions at $\sqrt{s_{NN}}$=200GeV using the STAR detector at RHIC. The $K^{*0}(892)$ mass is systematically shifted at small transverse momentum for both Au+Au and pp collisions. The $K^{*0}(892)$ transverse mass spectra are measured in Au+Au collisions at different centralities and in pp collisions. The $K^{*0}(892)$ mean transverse momentum as a function of the collision centrality is compared to those of identified $π^{-}$, $K^{-}$ and $\bar{p}$. The $K^{*}/K$ and $ϕ/K^{*}$ ratios are compared to measurements in A+A, $pp$, $\bar{p}p$, $e^{+}e^{-}$ collisions at various colliding energies. The physics implications of these measurements are also discussed.