Energy dependence of ϕ-meson production and elliptic flow in Au+Au collisions at STAR

2013/06/12 by Md. Nasim, Nasim, Md.
Physics and Astronomy · Mathematics · #High-Energy Particle Collisions Research #Stochastic processes and statistical mechanics

paper · pdf · doi:10.48550/arxiv.1306.2718

Abstract

We present, the measurements of the ϕ-meson production and elliptic flow (v₂) at mid-rapidity in Au + Au collisions at √s_NN = 7.7 - 200 GeV using the STAR detector in the years 2010 and 2011. The energy dependence of nuclear modification factors (R_\rmCP) is presented. At the intermediate transverse momentum (p_T) the Ω/ϕ ratio shows a different trend for √s_NN = 11.5 GeV compared to higher beam energies. This may suggest change of particle production mechanism at √s_NN = 11.5 GeV. The number-of-constituent quark (NCQ) scaling of v₂ has been studied at various beam energies. The NCQ scaling holds for all identified particles for √s_NN ≥ 19.6 GeV, which can be considered as an evidence of partonic collectivity. We observe at √s_NN = 7.7 and 11.5 GeV, the ϕ-meson v₂ falls off the trend from the other hadrons at highest measured p_T values by 1.8σ and 2.3σ, respectively. This may indicate that the hadronic interaction plays an important role at lower beam energies.

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