# Quark Matter 2018

13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

## Measurements of the Upsilon Meson Production in Au+Au Collisions at √sNN = 200 GeV by the STAR Experiment

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

Poster Quarkonia

### Speaker

Oliver Matonoha (Czech Technical University in Prague)

### Description

In ultra-relativistic heavy-ion collisions, creation of a novel state of matter, the quark-gluon plasma (QGP), has been observed. This hot, dense, and short-lived medium of deconfined quarks and gluons is experimentally very challenging to study. Suppressed production of heavy quarkonia, caused by colour screening of the binding force, has been viewed as a direct evidence of the QGP formation. Moreover, different quarkonium states are expected to dissociate at different temperatures, which can be used to constrain the properties of the medium.

In this poster, we will present recent measurements of the $\Upsilon$ production in Au+Au collisions at $\sqrt{s_\mathrm{NN}}=200$ GeV via the di-lepton channel by the STAR experiment at RHIC. At RHIC energies, other phenomena influencing the quarkonium production, such as the regeneration and co-mover absorption, are expected to have little or no effect for the bottomonium family, which makes it a cleaner probe compared to the $J/\psi$ meson. We will show the nuclear modification factors for both the ground and excited $\Upsilon$ states. Furthermore, we will compare these with results from p+Au collisions at RHIC, which provide a quantification of the cold nuclear matter effects, and also with measurements from Pb+Pb collisions at the LHC as well as with theoretical calculations.

Content type Experiment Presenter name already specified STAR

### Primary author

Zhenyu Ye (University of Illinois at Chicago)