What question did this study set out to answer?

The aim is to measure direct photons and neutral mesons to understand the properties of the hot medium created in heavy-ion collisions.

April 3, 2026

Neutral Meson and Direct Photon Measurements with ALICE at the LHC

Key Points

The aim is to measure direct photons and neutral mesons to understand the properties of the hot medium created in heavy-ion collisions.
Conducted measurements in pp, p-Pb, and Pb-Pb collisions at various energies.
Utilized electromagnetic decays of neutral mesons to analyze background effects.
Applied model calculations to compare with experimental data.
Provided accurate measurements of direct photon spectra and neutral meson production.
Demonstrated the ability to probe parton structure and energy loss in the hot medium.
Results align with QCD predictions, reinforcing their validity in heavy-ion collision environments.

Abstract

The ALICE experiment at the LHC is dedicated to the study of the hot and dense medium produced in ultrarelativistic heavy-ion collisions. Direct photons provide an excellent tool for testing QCD predictions, and serve as a valuable source of information about thermodynamic properties of the hot matter created in nucleus–nucleus collisions. Electromagnetic decays of neutral mesons produce dominant background for the direct photon and dielectron studies and should be measured with high accuracy. Furthermore, spectra of light neutral mesons provide excellent possibility to probe with high precision the parton structure of colliding nucleons and parton energy loss in hot medium. We report recent results from ALICE on the direct photon and neutral meson measurements in pp, p –Pb and Pb–Pb collisions at several energies together with the model calculations.

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