Measurement of the multi-hadron decays of omega, Ks and eta-mesons in heavy ion collisions at $\sqrt{s_{NN}}=200 GeV in the PHENIX experiment at RHIC

The PHENIX experiment at RHIC measured $\omega$, $\eta$ and $K_S^0$-meson production at high $p_T$ in $p+p$, $d+Au$ and $Au+Au$ collisions at $\sqrt{s_{NN}}=200$ $GeV$. Measurements performed in different hadronic decay channels give consistent results. The measured ratios of all three mesons to ${\pi }^0$ are found to be flat as a function of $p_T$ in $p+p$ collisions and equal to $\omega \mathrm{/}{\pi }^0=0.81\pm 0.02\pm 0.07$, $\eta \mathrm{/}{\pi }^0=0.48\pm 0.02\pm 0.02$ and $K_S^0\mathrm{/}{\pi }^0=0.45\pm 0.01\pm 0.05$. Nuclear modification factor measured for $\omega$-mesons in central Au+Au collisions is $R_{AA}=0.4\pm 0.15$.