Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Heavy-Ion Collisions and QCD Phases VIII

HK 50.1: Talk

Thursday, March 13, 2025, 15:45–16:00, HS 3 Chemie

Measurement of elliptic flow v₂ of neutral mesons in Pb–Pb collisions at √s_NN = 5.36 TeV with the ALICE EMCal — •Marvin Hemmer — Institut für Kernphysik, Goethe-Universität Frankfurt

The simultaneous description of the elliptic flow and production rate of direct photons in ultra-relativistic heavy-ion collisions, known as the "direct-photon puzzle", remains a key theoretical challenge. Distinguishing the elliptic flow of direct photons from that of decay photons, primarily from π⁰ mesons, requires a precise estimate of π⁰ flow. Additionally, studying the flow of various baryons and mesons sheds light on the underlying production mechanisms.

During LHC Run 3, the ALICE experiment recorded 100 times more Pb–Pb collisions than in Run 2, enabling more detailed studies of these phenomena. In ALICE, π⁰ mesons can be reconstructed e.g. by detecting their decay photons with the electromagnetic calorimeter (EMCal). In this talk, the first π⁰ elliptic flow measurements in Pb–Pb collisions at √s_NN = 5.36 TeV will be presented.

Keywords: ALICE; Flow; meson; heavy ion; Run3