# ICHEP 2020

28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

## Production of D$^{\pm}$ mesons in Au+Au collisions at $\sqrt{s_\mathrm{NN}}$ = 200 GeV at the STAR experiment

30 Jul 2020, 13:39
3m
virtual conference

#### virtual conference

Poster 07. Heavy Ions

### Speaker

Jan Vaněk (Nuclear Physics Institute, Czech Academy of Sciences)

### Description

Charm quarks are an excellent probe of the quark-gluon plasma created in heavy-ion collisions as they are produced at very early stages of such collisions and subsequently experience the whole evolution of the system. At the STAR experiment, charm quark production can be measured by direct topological reconstruction of open-charm hadrons thanks to the exceptional spatial resolution of the Heavy-Flavor Tracker detector.

In this poster, we will present a measurement of D$^\pm$ meson production in Au+Au collisions at $\sqrt{s_\mathrm{NN}}$ = 200 GeV by the STAR experiment using data collected in 2014 and 2016. Supervised machine-learning techniques were used to maximize signal significance in raw yield extraction from the three body hadronic decay channel $\textrm{D}^\pm \rightarrow \textrm{K}^\mp \pi^\pm \pi^\pm$. The D$^\pm$ invariant spectrum was then obtained in 0-10%, 10-40%, and 40-80% central Au+Au collisions. The measured nuclear modification factor $R_\mathrm{AA}(p_\mathrm{T})$ reveals a significant suppression of high-$p_\mathrm{T}$ D$^\pm$ mesons in central (0-10%) and mid-central (10-40%) Au+Au collisions with respect to p+p collisions. The $(\textrm{D}^++\textrm{D}^-)/(\textrm{D}^0+\overline{\textrm{D}^0})$ yield ratio has also been extracted and compared to that from PYTHIA calculations.

### Primary author

Jan Vaněk (Nuclear Physics Institute, Czech Academy of Sciences)

### Presentation Materials

 ICHEP2020_poster_Vanek_final.pdf ICHEP2020_slides_Vanek_final.pdf