Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Heavy-Ion Collisions and QCD Phases XIV

HK 56.5: Vortrag

Mittwoch, 13. März 2024, 18:30–18:45, HBR 62: EG 05

Measurement of neutral meson and photon production in Pb–Pb collisions at √s_NN = 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 (p_T) of the direct photons carry information on their production time and mechanism; while low p_T direct photons are produced in the QPG phase of the collision, photons at high p_T 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 √s_NN = 5.02 TeV is presented. Additionally,the status of the direct photon analysis at high p_T will be discussed.