Using the $\varphi$-meson elliptic flow to map the strength of partonic interaction

Abstract

A compilation of recently measured STAR data for elliptic flow ($v_2$) of $\varphi$ mesons in RHIC Beam Energy Scan program and comparison with a multiphase transport model (AMPT) has been presented. The experimental data at $\sqrt{s_{NN}}$ $\ge$ 19.6 GeV agrees well with string melting version of the AMPT model. The model includes partonic interactions and quark coalescence as a mechanism of hadronization. This indicates that there is a substantial contribution to collectivity from partonic interactions at $\sqrt{s_{NN}}$ $\ge$ 19.6 GeV. The measured $\varphi$-meson $v_2$ at $\sqrt{s_{NN}}$ = 7.7 and 11.5 GeV are found to be smaller than those obtained from AMPT model without partonic interactions. This indicates negligible contribution of partonic collectivity to the observed $\varphi$-meson $v_2$ at $\sqrt{s_{NN}}$ $\le$ 11.5 GeV.

5 pages, 3 figures, accepted for publication as a Regular Article in Physical Review C

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Cited by in corpus (1)

• Elliptic flow of $\varphi$-meson at intermediate $p_T$: Influence of mass versus quark number