# 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

May 31, 2020 to June 5, 2020
Online
US/Central timezone

## PHENIX results on quark flavor dependence of flow in Au+Au collisions

Jun 2, 2020, 7:30 AM
1h 20m
Online

#### Online

Poster Presentation Heavy Flavor and Quarkonia

### Speaker

Takashi Hachiya (Nara Women's University (JP))

### Description

An outstanding puzzle in heavy ion physics is the mechanism that generates
collective motion of heavy quarks (charm and bottom) in large collision
systems. The measured azimuthal anisotropy coefficient $v_2$ of electrons
from heavy quarks closely resemble those of light quarks, despite the
several orders of magnitude differences in quark mass. In order to further
understand the quark mass dependence of the flow, we have measure $v_2$ of
electrons from charm and bottom quark decays separately. In contrast to the
apparent heavy quark flow, attempts to measure the $J/\psi$, a charmonium
state, have so far only yielded results consistent with zero. 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.

Track Heavy Flavor and Quarkonia Contributed Talk PHENIX

### Primary author

Gabor David (Brookhaven National Laboratory)