# QM 2022

Apr 4 – 10, 2022
Auditorium Maximum UJ
Europe/Warsaw timezone
Proceedings submission deadline extended to September 11, 2022

## Charm and Bottom quark energy loss and flow measurements in Au+Au collisions by the PHENIX experiment

Apr 6, 2022, 4:00 PM
20m
small aula (Auditorium Maximum UJ)

### small aula

#### Auditorium Maximum UJ

Oral presentation Strongly coupled systems

### Speaker

Takashi Hachiya (RIKEN)

### Description

The energy loss of quarks when travelling a QGP medium is expected to depend on their mass. Heavy quarks causes a dead cone region along the direction of the quark where no energy is lost by gluon bremsstrahlung. This effect can be measured by comparing the nuclear modification factors of hadrons made of light and heavy quarks. The heavy quark coupling with the thermalized QGP is also an important aspect in probing the thermodynamics of QGP. The coupling is studied by the measurement of the flow harmonics ($v_2$) and its dependency on the transverse momentum $p_{\rm T}$ of the probe and on the collision centrality.
The PHENIX experiment contains a set of vertex detectors which enable the measurement of the distance of the closest approach (DCA) of identified electrons and muons. By utilizing their DCAs, identification of charm and bottom semi-leptonic decays was realized in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV. The $p_{\rm T}$ and collision centrality dependence of the nuclear modification and $v_2$ for charm and bottom hadrons were thus measured at mid-rapidity region ($|\eta|<$0.35) using the large dataset from the RHIC Year-2014 run. The $p+p$ yield used as a reference was obtained via semi-leptonic decay of heavy quarks and non-prompt J/$\psi$ yield ($B\rightarrow J/\psi+X$). The final results from this work will be presented and discussed in the view of the heavy quark energy loss, its coupling to and diffusion in QGP.