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

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

## Bottomonium production in p+p and Pb+Pb collisions with ATLAS

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

#### Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Heavy flavor and quarkonium

### Speaker

Songkyo Lee (Iowa State University (US))

### Description

Bottomonium, a bound state of a bottom quark and its antiquark, is an excellent probe of the hot and dense medium created in heavy-ion collisions at LHC. The ATLAS collaboration collected the large datasets of $pp$ and Pb+Pb collisions in 2017 and 2018 corresponding to integrated luminosities of 242 pb$^{-1}$ and 1.39 nb$^{-1}$ respectively, at a centre-of-mass energy per nucleon pair of 5.02 TeV. In this poster, bottomonium states are reconstructed via the dimuon decay channel in the rapidity range of $|y| < 1$, and their production in PbPb collisions is compared to that in pp collisions to extract the nuclear modification factor, $R_{AA}$, as a function of event centrality and transverse momentum. In addition, the relative suppression of the excited states Y(nS) to the ground state Y(1S) is studied.

### Primary author

Songkyo Lee (Iowa State University (US))