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 46.5: Vortrag

Mittwoch, 13. März 2024, 16:45–17:00, HBR 62: EG 18

Measurement of dielectrons in pp collisions at √s = 13.6 TeV with ALICE in Run 3 — •Florian Eisenhut — Goethe Universität Frankfurt

Dielectrons are a unique tool to study the space-time evolution of the hot and dense matter created in relativistic heavy-ion collisions. In pp collisions, measurements of the dielectron production serve as reference for heavy-ion studies, providing some insight into the different e⁻e⁺ background sources. In high charged-particle multiplicity events, dielectron measurements allow us to search for thermal radiation in small systems. Thanks to the upgrades performed during the LHC Long Shutdown 2, ALICE is now capable to read out pp collision data at an acquisition rate 1000 times faster than previously. The larger data samples recorded during the Run 3 data taking period, together with the improved tracking capabilities at low transverse momenta and pointing resolution of the detector, allow us to study the e⁺e⁻ pair production of dielectrons originating from displaced open heavy-flavour hadron decays or prompt decays.

This talk will give an overview of the first results on dielectron production in pp collisions at √s = 13.6 TeV obtained with ALICE Run 3 data. It will summarize the techniques used to select electrons and improve the signal-to-background ratio in the dielectron analysis, as well as present the separation power of the new detector for prompt and non-prompt dielectron sources.

Keywords: Dielectrons; ALICE; CERN; pp collisions; prompt/non-prompt sources