Abstract
We present measurements of ϕ-meson production and elliptic flow (v2) at mid-rapidity in Au + Au collisions at = 7.7 – 200 GeV. Energy dependence of nuclear modification factor (RCP) of ϕ meson is presented. The ϕ-meson RCP has a value ≥ 1.0 for ≤ 39 GeV. The Ω/ϕ ratios are also presented and show a different trend at the intermediate transverse momentum (pT) for = 11.5 GeV compared to higher beam energies. The number-of-constituent quark (NCQ) scaling of v2 has been studied at various beam energies. The NCQ scaling holds for particles and anti-particles separately including the ϕ meson for ≥ 19.6 GeV, which can be considered as an evidence of partonic collectivity. We observe that ϕ-meson v2 falls off the trend from the other hadrons at highest measured pT values by 1.8σ and 2.3σ at = 7.7 and 11.5 GeV, respectively.
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