# QCD@LHC 2019

Jul 15 – 19, 2019
US/Eastern timezone

## Electroweak boson measurements with ALICE

Jul 18, 2019, 4:30 PM
20m
2213 A Chair : Timothy Hobbs

### 2213 A Chair : Timothy Hobbs

PDFs/alpha_S/Soft

### Speaker

Diego Stocco (Subatech)

### Description

W and Z bosons are created in the hard scattering processes occurring in the initial stage of heavy-ion collisions and they are insensitive to the presence of a strongly-interactive medium. This makes them a clean probe of the initial-state effects of the collision, such as the nuclear modification of the parton distribution functions (PDFs). The measurement of the electroweak boson production in p-Pb and Pb-Pb collisions at the LHC provides constraints on the nPDFs of the (anti-)quarks in a phase-space region that is poorly constrained by previous experiments. ALICE measures the electroweak boson production in the muonic decay channel in p-Pb and Pb-Pb collisions at large rapidities ($2.5 < y_{lab} < 4$ in the laboratory reference frame). These measurements are complementary to those performed by ATLAS and CMS at mid-rapidity. In this talk, we review the measurements in heavy-ion collisions, with a focus on the most recent results. In particular, the rapidity and centrality dependence of the Z-boson production in Pb-Pb collisions at a center of mass energy per nucleon of $\sqrt{s_{\rm NN}} = 5.02$ TeV will be presented and the status of the analysis of the 2018 data sample will be discussed. The new results on Z-boson production in p-Pb collisions at $\sqrt{s_{\rm NN}} = 8.16$ TeV will be discussed as well. The results will be compared to calculations obtained with or without including the nuclear modifications of the PDFs.

### Primary author

Diego Stocco (Subatech)

 Slides