Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Heavy-Ion Collisions and QCD Phases XII

HK 56.1: Gruppenbericht

Freitag, 3. April 2020, 11:00–11:30, J-HS F

Measurement of light neutral mesons and direct photons in Pb-Pb collisions with ALICE at the LHC — •Meike Danisch for the ALICE collaboration — Physikalisches Institut Heidelberg

The ALICE experiment is dedicated to the study of the quark-gluon plasma (QGP) formed in heavy-ion collisions. Direct photons are excellent probes to investigate the space-time evolution and temperature of the QGP. Neutral mesons like π⁰ and η can provide important information on the energy loss mechanisms of partons in the medium. Furthermore, they constitute the largest background contribution for direct photons. In the ALICE experiment, neutral mesons can be measured via their decay to two photons. Apart from the two calorimeters EMCal and PHOS, photons can also be reconstructed via the Photon Conversion Method (PCM). The latter exploits the fact that a photon can convert to an electron-positron pair in the detector material. These charged particles can then be detected via their tracks in the Time Projection Chamber (TPC) and the Inner Tracking System (ITS). In this talk an overview of neutral meson and direct photon production in Pb–Pb collisions as measured by ALICE will be presented.