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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Heavy-Ion Collisions and QCD Phases XII

HK 57.1: Vortrag

Donnerstag, 31. März 2022, 14:00–14:15, HK-H2

Measurement of direct photons in √s_NN=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 p_T=0.4 GeV/c.

In this talk, we present the first measurements of direct photon production in Pb–Pb collisions at √s_NN=5.02 TeV by ALICE, including direct photon spectra from central to peripheral events.