Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Heavy-Ion Collisions and QCD Phases III

HK 16.4: Vortrag

Dienstag, 11. März 2025, 14:45–15:00, HS 3 Chemie

Dielectron production and topological separation of dielectron sources with ALICE in Run 3 — •Jerome Jung for the ALICE Germany collaboration — Goethe University, Frankfurt, Germany

Dielectrons are an exceptional tool to study the properties of hadronic and nuclear collisions as they can leave the strongly interacting system at any stage of its evolution. However, the interpretation of their spectra relies on a precise understanding of all contributing sources. To single out potential medium contributions in nucleus*nucleus collisions on top of those from hadron decays, studies in hadronic collisions are instrumental to obtain a reference measurement.
To measure prompt sources at invariant masses above 1.2 GeV/c², such as Drell-Yan or thermal dielectrons, it is necessary to disentangle these contributions from the large physics background from correlated semi-leptonic decays of heavy-flavor hadrons. The upgraded ALICE detector with its increased pointing resolution and higher data acquisition rates allows disentangling these contributions based on their topology using the distance-of-closest approach (DCA) to the primary vertex with high precision.
This talk presents the status of the analysis of dielectron production in proton-proton collisions at √s=13.6 TeV from LHC Run 3 recorded with ALICE. The increased topological separation power is demonstrated. Finally, DCA templates of expected sources are fitted to the data to separate the yield from prompt and non-prompt sources.

Keywords: ALICE; Dielectrons; Run 3; DCA; CERN