Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Heavy-Ion Collisions and QCD Phases VII
HK 41.1: Gruppenbericht
Donnerstag, 19. März 2026, 16:15–16:45, PHIL A 602
Dielectron production in pp and Pb−Pb collisions with ALICE in LHC Run 3 — •Emma Ege for the ALICE Germany collaboration — Goethe Universität, Frankfurt, Germany
Dielectrons are ideal probes to study the properties of strongly-interacting matter, produced in relativistic heavy-ion collisions, as they are created in all stages of the collision and do not interact strongly with the medium. However, at LHC energies, the thermal dielectrons emitted in the early stages from the quark-gluon plasma (QGP) are overshadowed by correlated e+e−-pairs from semi-leptonic decays of heavy-flavor (HF) hadrons. Since the decay length of HF hadrons is much larger than that of prompt contributions, such as from the thermal radiation, dielectrons can be topologically separated based on their distance-of-closest approach (DCA) to the primary vertex of the collision. DCA measurements in pp collisions enable the search for prompt sources in small systems and can be used as a baseline for heavy-ion studies to identify the thermal radiation of the QGP. The improved pointing resolution of the upgraded ALICE detector for Run 3 leads to a better topological separation of prompt thermal radiation and non-prompt e+e−-pairs from HF hadron decays.
In this talk, an overview of the latest results regarding the dielectron production in pp collisions at √s=13.6 TeV and Pb−Pb collisions at √sNN=5.36 TeV in Run 3, recorded with the ALICE detector, is given. A special focus is set on the topological separation with DCA, and the impact of the detector upgrades on the dielectron analysis.
Keywords: dielectrons; heavy-ion collision; quark-gluon plasma; ALICE; LHC Run 3