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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Heavy-Ion Collisions and QCD Phases XIV

HK 56.5: Talk

Wednesday, March 13, 2024, 18:30–18:45, HBR 62: EG 05

Measurement of neutral meson and photon production in Pb–Pb collisions at sNN = 5.02 TeV with the ALICE EMCal — •Marvin Hemmer for the ALICE Germany collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

Direct photon production in Pb–Pb collisions can be utilised to study the properties of the QGP and the different stages of the collision. The transverse momenta (pT) of the direct photons carry information on their production time and mechanism; while low pT direct photons are produced in the QPG phase of the collision, photons at high pT are predominately produced during the initial scattering and hence are an ideal probe to study initial conditions of the colliding nuclei.

To disentangle direct photons and photons from hadronic decays, most notably the π0 and η mesons, a precise measurement of the π0 and η spectra is needed. In ALICE neutral mesons can be measured using different reconstruction methods. For π0 and η mesons at high transverse momentum these methods are based on the detection of decay photons with the EMCal calorimeter.

In this talk, the measurement of π0 and η mesons with the ALICE EMCal in Pb–Pb collisions at √sNN = 5.02 TeV is presented. Additionally,the status of the direct photon analysis at high pT will be discussed.

Keywords: ALICE; neutral meson; direct photon; calorimeter

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