MEASUREMENT OF THE MULTI-HADRON DECAYS OF ω, $K^0_S$ AND η-MESONS IN HEAVY ION COLLISIONS AT $\sqrt{^SNN} = 200\ {\rm GeV}$ IN THE PHENIX EXPERIMENT AT RHIC

Abstract

The PHENIX experiment at RHIC measured ω, η and [Formula: see text]-meson production at high pT in p + p, d + Au and Au + Au collisions at [Formula: see text]. Measurements performed in different hadronic decay channels give consistent results. The measured ratios of all three mesons to π0 are found to be flat as a function of pT in p + p collisions and equal to ω/π0 = 0.81 ± 0.02 ± 0.07, η/π0 = 0.48 ± 0.02 ± 0.02 and [Formula: see text]. Nuclear modification factor measured for ω-mesons in central Au + Au collisions is RAA = 0.4 ± 0.15.