# Quark Matter 2018

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

## Charged particle suppression in Pb+Pb, Xe+Xe, and $p$+Pb collisions measured with the ATLAS detector

May 15, 2018, 9:40 AM
20m
Sala Perla, 1st Floor (Palazzo del Casinò)

### Sala Perla, 1st Floor

#### Palazzo del Casinò

Parallel Talk Jet modifications and high-pT hadrons

### Speaker

Petr Balek (Weizmann Institute of Science (IL))

### Description

The measurement of charge particle production in heavy ion collisions, when compared with $pp$ data, provides insight into the properties of the hot and dense quark-gluon plasma. The ATLAS detector at the LHC recorded 0.49 nb$^{-1}$ of Pb+Pb collisions, 25 nb$^{-1}$ of $p$+Pb collisions and 4.2 pb$^{-1}$ of $pp$ collisions, all at the center-of-mass energy $\sqrt{s_{NN}}=\sqrt{s}=5.02$ TeV. Recently, ATLAS also recorded 3 $\mu$b$^{-1}$ of Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV, which offers a new opportunity to study the system size dependence of the parton energy loss. The large acceptance of the ATLAS detector allows measurements of charged hadron spectra in a wide range of both pseudorapidity and transverse momentum, differentially in collision centrality. The charged hadron spectra measured in Pb+Pb, Xe+Xe, and $p$+Pb collisions are compared to the analogous spectra measured in $pp$ collisions, and the resulting nuclear modification factors $R_\mathrm{AA}$ and $R_\mathrm{pPb}$ are studied.

Centralised submission by Collaboration Presenter name already specified Experiment ATLAS

### Primary author

Barbara Krystyna Wosiek (Institute of Nuclear Physics Polish Academy of Sciences (PL))