Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Heavy-Ion Collisions and QCD Phases XI

HK 46.6: Vortrag

Mittwoch, 13. März 2024, 17:00–17:15, HBR 62: EG 18

Measurement of dielectrons in Pb-Pb collisions with ALICE in Run 3 — •Emma Ege for the ALICE Germany collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

Dielectrons are a unique probe to study the properties of strongly-interacting matter produced in heavy-ion collisions, especially of the quark-gluon plasma (QGP), as they do not interact strongly and are created in all stages of the collision. Thermal radiation from the QGP carries information about the early temperature of the medium. At LHC energies, it is nevertheless dominated by a large background from correlated heavy-flavor hadron decays.

With the upgrades of the ALICE detector for the LHC Run 3 data taking period, an improved pointing resolution and a higher data acquisition rate, by up to a factor 100 for Pb-Pb collisions, are achieved. Both will help to reduce significantly the statistical and systematic uncertainties of dielectron measurements and understand the contribution from displaced correlated open heavy-flavor hadron decays.

In this talk the status of the current analysis of Pb-Pb data from 2023 with ALICE will be presented. In particular the first dielectron spectra will be shown. Additionally we will investigate the distance of closest approach (DCA) of the electrons to the primary vertex of the collision in different invariant mass ranges.

Keywords: Dielectrons; ALICE; CERN; Pb-Pb collisions; QGP