Light neutral meson production in the era of precision physics at the LHC

TL;DR

This paper reviews the measurement of light neutral meson production in various collision systems at the LHC using the ALICE detector, highlighting advances in precision and their implications for understanding QGP and testing QCD.

Contribution

It presents new high-precision measurements of neutral mesons in pp, p--Pb, and Pb--Pb collisions, utilizing advanced reconstruction techniques with large LHC Run 2 data.

Findings

Enhanced measurement precision of neutral mesons in different collision systems.

Insights into parton energy loss in Quark-Gluon Plasma.

Validation of perturbative QCD predictions at LHC energies.

Abstract

The production of light neutral mesons in different collision systems is interesting for a variety of reasons: In nucleus-nucleus (AA) collisions the measurements provide important information on the energy loss of partons traversing the Quark-Gluon Plasma (QGP) which is formed in heavy-ion collisions at the LHC. In proton--proton (pp) collisions, neutral mesons allow us to test with high precision the predictions of perturbative QCD and other model calculations, and also serve as a reference for pA and AA collisions. In pA collisions, cold nuclear matter effects are studied. In the ALICE experiment, which is dedicated to the study of the QGP, neutral mesons can be detected via their decay to two photons. The latter can be reconstructed using the two calorimeters EMCal and PHOS or via conversions in the detector material. Combining state-of-the-art reconstruction techniques with the large data sample delivered by the LHC in Run 2 gives us the opportunity to enhance the precision of our measurements. In these proceedings, an overview of neutral meson production in pp, p--Pb and Pb--Pb collisions at LHC energies, as measured with the ALICE detector is presented.