# 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

May 31, 2020 to June 5, 2020
Online
US/Central timezone

## Electroweak probes in heavy-ion collisions with ATLAS

Jun 1, 2020, 11:00 AM
20m
https://cern.zoom.us/j/91030448357

#### https://cern.zoom.us/j/91030448357

Oral Presentation Electroweak Probes

### Speaker

Iwona Grabowska-Bold (AGH University of Science and Technology (PL))

### Description

Electroweak bosons produced in lead-lead (Pb+Pb) collisions are an excellent tool to constrain initial-state effects which affect the rates of hard-scattering processes in nucleus-nucleus interactions. The production yields of massive electroweak bosons, observed via their leptonic decay channels, offer a high-precision test of the binary collision scaling expected in Pb+Pb and a way to quantify nuclear modifications of the parton distribution functions (PDFs).
The large samples of Pb+Pb data at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV collected by the ATLAS experiment in 2015, and the corresponding high-statistics $pp$ data at the same collision energy used as a baseline, allow for a detailed experimental study of these phenomena and comparisons to predictions from a variety of theoretical calculations. This talk presents the latest ATLAS results on electroweak boson production, including updated results on Z production and high-precision W boson results in Pb+Pb collisions. Inclusive production of prompt photons in proton-lead~($p$+Pb) collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV is also covered.
Various predictions of nuclear modifications to PDFs are discussed.

Contribution type Contributed Talk ATLAS Electroweak Probes

### Primary authors

Lidija Zivkovic (Institute of physics Belgrade (RS))

### Presentation materials

 HardProbes2020-EWBosonsAtlas-062020.pdf New light-by-light measurement Recording