Speaker
Description
W and Z boson measurements provide a clean probe of the hard scatterings taking place in the initial stages of hadronic collisions. In particular, measurements in pp collisions provide a useful reference to test pQCD calculations, while results in p-Pb and Pb-Pb collisions provide a useful insight in the nuclear parton distribution functions (nPDFs) of the involved nuclei. Such observations are especially important in a phase space region that is poorly constrained by previous experiments, and represent an important reference to properly understand nuclear modification effects in other measurements. In this contribution the most recent measurements on W and Z boson production by the ALICE collaboration are discussed, including invariant production yields and nuclear modification factors. W and Z bosons are measured in ALICE via their leptonic decays in the electron channel at midrapidity ($|\eta_\mathrm{lab}| < 0.8$) and the muon channel at forward rapidity ($2.5 < \eta_\mathrm{lab} < 4$). New measurements on W bosons in pp collisions at $\sqrt{s} = 13$ TeV are presented, as well as the latest results on Z and W bosons in p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 8.16$ TeV and Pb-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02~{\rm TeV}$. Differential measurements as a function of rapidity and collision centrality are compared to previous experimental results and to the available theoretical calculations, providing constraints on the corresponding models and the considered nPDFs.
| First author | ALICE CC Chairs |
|---|---|
| alice-cc-chairs@cern.ch | |
| Collaboration / Activity | ALICE |
