Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Heavy-Ion Collisions and QCD Phases XII
HK 57.1: Talk
Thursday, March 31, 2022, 14:00–14:15, HK-H2
Measurement of direct photons in √sNN=5.02 TeV Pb-Pb collisions with ALICE at the LHC — •Meike Danisch for the ALICE collaboration — Physikalisches Institut Heidelberg
Measurements of direct photons can provide valuable information on the properties and dynamics of the quark-gluon plasma (QGP) by comparing them to model calculations that describe the whole evolution of the system created in heavy-ion collisions, from the initial conditions to the pre-equilibrium, QGP, and hadronic phases.
In the ALICE experiment, photons can be reconstructed either by using the calorimeters or via conversions in the detector material. The photon conversion method benefits from an excellent energy resolution and is able to provide direct photon measurements down to pT=0.4 GeV/c.
In this talk, we present the first measurements of direct photon production in Pb–Pb collisions at √sNN=5.02 TeV by ALICE, including direct photon spectra from central to peripheral events.