Electroweak probes in heavy-ion collisions with ATLAS

Jun 1, 2020, 11:00 AM


Oral Presentation Electroweak Probes Parallel


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


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
Track Electroweak Probes
Collaboration (if applicable) ATLAS

Primary authors

ATLAS Collaboration Lidija Zivkovic (Institute of physics Belgrade (RS))

Presentation materials