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%where the non-flow effects are estimated using low-multiplicity events (⟨Nch⟩ < 20) and then subtracted. The subtraction was performed either by a “template fit”, which includes the pedestal level from the ⟨Nch⟩ < 20 events, or by a “peripheral subtraction”, which sets the pedestal level by a zero-yield at minimum (ZYAM) procedure

\begin{center}
{\large Systematic study of small system collectivity from STAR}

\vspace{8mm}
{Shengli Huang, Prithwish Tribedy}
%\affiliation{Department of Chemistry, State University of New York, Stony Brook, New York 11794, USA}
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\linenumbers

How collectivity originates and evolves with collision system size is a highly debated topic in the heavy ion community. To address this, we propose the study of collision systems with decreasing system sizes: Ru+Ru/Zr+Zr $>$ $^{3}$He+Au $>$ d+Au $>$ p+Au $>$ p+p $>$ $\gamma$+Au. 

We present results on the elliptic ($v_2$) and triangular ($v_3$) anisotropy on p+Au, d+Au and $^{3}$He+Au collisions at 200 GeV with a comprehensive evaluation of the non-flow effects using different subtraction methods with the minimum-bias p+p collisions as a reference.  We find $v_3$ to be weakly dependent on the system and centrality. This puts constraints on shape engineering at nucleon scale and provides strong evidence of fluctuations at the sub-nucleon scale.

In addition to the results obtained from the mid-rapidity acceptance ($|\eta|<$1), we also use the Event Plane detector over 2.1$<|\eta|<$5.1 to investigate the potential influence of longitudinal flow de-correlations using peripheral Ru+Ru/Zr+Zr data. 

Our key addition of photo-nuclear ($\gamma$+Au) processes can push the boundaries of small systems scan at RHIC. Measurements on long-range di-hadron correlations and harmonic anisotropy coefficients in high activity $\gamma$+Au-rich events are presented to search for evidences of collectivity. 
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