ϕ meson production in Au + Au and pp collisions at RHIC

Abstract

We present the results for the measurement of ϕ meson production in Au+Au and pp collisions at the relativistic heavy ion collider (RHIC). Using the event mixing technique, spectra and yields are obtained from the ϕ → 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 ϕ meson is flat as a function of rapidity; the ⟨pT⟩ of ϕ, extracted from the fit function to the spectra, shows a different behaviour as a function of centrality than that of π−, K− and .