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

Author:

Carolina Arata

Keyword:

Nuclear Experiment, Nuclear Experiment (nucl-ex), High Energy Physics - Experiment (hep-ex)

journal:

date:

2023-12-15 00:00:00

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 $\sqrt{s_{\rm NN}}$ = 5.02 TeV. The isolated photons $\gamma^{\rm iso}$ 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 $\gamma^{\rm iso}$ with hadrons in Pb--Pb and the hadron$z_{\rm T}$ distributions $D(z_{\rm T})$ are presented, showing a centrality-dependent suppression compared to the pQCD NLO pp reference.

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