# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Measurements of jet suppression and modification in heavy-ion collisions with ATLAS

26 Jul 2021, 11:00
15m
Zoom

#### Zoom

Parallel session talk Heavy Ion Physics

### Speaker

Christopher McGinn (ATLAS, sPHENIX, University of Colorado Boulder)

### Description

Measurements of jet suppression and modification in heavy-ion collisions provide powerful and broad information on the dynamics of the hot, dense plasma formed in relativistic nucleus-nucleus collisions. In this talk we present measurements of jet energy loss and modification which are performed using the high-statistics Pb+Pb collision data at 5.02 TeV recorded during 2018 with the ATLAS detector at the LHC. These data can provide insight into the path length or system size dependence of energy loss, fluctuations in the energy loss process, the modification of parton fragmentation, and the re-distribution of lost energy.

This talk will first present a broad measurement of the single jet yields as a function of the azimuthal angle with respect to the 2nd, 3rd, and 4th event planes in Pb+Pb collisions. The azimuthal anisotropies for jets are reported as a function of jet $p_{\rm T}$ and centrality. This talk will also present a measurement of the fully unfolded dijet momentum balance in high-statistics Pb+Pb and pp data. The balance distributions are presented as a function of centrality and leading jet $p_{\rm T}$, exploring a significantly higher kinematic range than Run 1 results. Finally, the talk presents a measurement of Z-tagged charged hadron yields, which feature an opportunity to understand the energy loss, and its redistribution by the medium, for low-$p_{\rm T}$ partons in a calibrated way.

Email Lidija.Zivkovic@cern.ch Lidija Zivkovic ATLAS

### Primary authors

Christopher McGinn (ATLAS, sPHENIX, University of Colorado Boulder)