Probing the QCD phase diagram with measurements of -meson production and elliptic flow in heavy-ion collisions at STAR

14th International Conference on Strangeness in Quark Matter

Nasim, Md^1

National Institute of Science Education and Research (NISER), Bhubaneswar-751005, India^1

关键词: Au+Au collisions;    Elliptic flows;    Energy dependence;    Heavy ion collision;    Measurements of;    Nuclear modification factors;    Qcd phase diagrams;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012070/pdf
DOI  :  10.1088/1742-6596/509/1/012070

来源: IOP

【 摘 要 】

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 v2has 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 v2falls off the trend from the other hadrons at highest measured pTvalues by 1.8σ and 2.3σ at 7.7 and 11.5 GeV, respectively.