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

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

## Quark flavor dependence of particle flow in nucleus-nucleus collisions measured by PHENIX

5 Nov 2019, 15:00
20m
Ball Room 1 (Wanda Reign Wuhan Hotel)

### Ball Room 1

#### Wanda Reign Wuhan Hotel

Oral Presentation Collective dynamics and final state interaction

### Speaker

Takahito Todoroki for the PHENIX Collaboration (Brookhaven National Laboratory)

### Description

An outstanding puzzle in the field is the mechanism that generates collective motion of heavy quarks (charm and bottom) in large collision systems. The measured azimuthal anisotropies of electrons from heavy quarks closely resemble those of light quarks, despite the enormous differences in quark mass. In order to further understand the quark mass dependence of the flow, we have separated the flow contributed from charm and bottom quarks. As opposed to the apparent heavy quark flow, the $J/\psi$, a charmonium state, has shown no significant flow at RHIC by now. Consistent understanding of the results will need results with better precision as well as comparisons with models including quark recombination process. We will present $v_2$ vs $p_T$ of $J/\psi$ and of electrons originating from charm and bottom decays measured at mid-rapidity in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Implications for the origins of collective motion of heavy quarks and quarkonia will be discussed.

### Primary author

Takahito Todoroki for the PHENIX Collaboration (Brookhaven National Laboratory)