# Quark Matter 2019 - the XXVIIIth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions

3-9 November 2019
Wanda Reign Wuhan Hotel
Asia/Shanghai timezone

## Multiplicity and rapidity dependence of v2 in small system by using two-particle correlations

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

#### Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Small systems

### Speaker

Qiao Xu (Vanderbilt University (US))

### Description

Recent PHENIX measurements indicate that the initial geometry is the cause of the observed positive $v_2$ and $v_3$ in high-multiplicity p+Au, d+Au, and $^3$He+Au collisions at $\sqrt{s_{\rm NN}} = 200$~GeV. These results were obtained using the event-plane method, with the event plane determined in the backward rapidity range and correlated with particles in other sub-events at mid- and forward-rapidity. In this poster, we present the latest PHENIX measurements, in which we employ the two-particle correlation method and investigate the effects of the size of the rapidity gap between particles as well as different non-flow subtraction methods in order to understand possible non-flow contributions to the observed $v_2$. We also extend the measurements of $v_2$ from most-central to peripheral collisions to understand the centrality evolution of $v_2$ in small systems. In this poster, we will present the current analysis status of $v_2$ measurement via the two particle correlation analysis with various subtraction methods in a wide centrality range of p+Au collisions at $\sqrt{s_{\rm NN}} = 200$~GeV.

### Primary author

Qiao Xu (Vanderbilt University (US))