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Jan 10 – 15, 2021
Weizmann Institute of Science
Asia/Jerusalem timezone
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Measurements of $v_2$ and $v_3$ in $p$Au, $d$Au and $^3$HeAu collisions at RHIC energy from STAR

Jan 12, 2021, 6:40 PM
Andrea’s room 1 (vDLCC)

Andrea’s room 1


oral Collective dynamics from small to large systems CD


Shengli Huang (Stony Brook University)


In this presentation, measurements of $v_2$ and $v_3$, in the p/d/$^3$He+Au collisions at 200 GeV will be shown as a function of $p_{T}$ and multiplicity from STAR. The non-flow is studied with several different methods using p+p collision as a reference. It has been found that non-flow subtracted $v_{n}$ signals are not sensitive to these methods. The $v_2$ signals are also extracted using four-particle azimuthal correlations for comparison. A system independence of $v_{3}$ has been observed for three small systems as a function of $p_{T}$. Comparison with hydro-calculations with different assumptions on the initial conditions indicates that the initial geometry in small system may be dominated by sub-nulceon fluctuations. Similar to large systems, at comparable centralities, $v_{n}$ in p+Au at RHIC has also been found to be similar to those in p+Pb at the LHC. In the context of our measurement we will also discuss the prospects of the proposed O+O run at RHIC. It will facilitate a direct comparison with the results from an anticipated O+O run at the LHC, and further help us to address the underlying physics for the anisotropic behavior and initial geometry in small system.

Primary author

Shengli Huang (Stony Brook University)

Presentation materials