Direct photon $p_{\mathrm{T}}$ spectra and correlations measured with ALICE

Abstract

This contribution discusses the measurements of direct photons in pp and Pb--Pb collisions from the LHC Run 2, as recorded by the ALICE experiment. Specifically, we focus on the isolated photons results obtained at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. The isolated photons ${\gamma }^{\mathrm{iso}}$ spectra in pp and Pb--Pb collisions are presented together with the nuclear modification factor, that is found to be consistent with unity. The azimuthal correlations of ${\gamma }^{\mathrm{iso}}$ with hadrons in Pb--Pb and the hadron$z_{\mathrm{T}}$ distributions $D(z_{\mathrm{T}})$ are presented, showing a centrality-dependent suppression compared to the pQCD NLO pp reference.

arXiv comment4 pages, 2 figures. Proceedings of Quark Matter 2023 - XXXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Houston, TX, 3-9 September 2023