Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Heavy-Ion Collisions and QCD Phases II
HK 15.4: Talk
Tuesday, March 17, 2026, 17:00–17:15, PHIL C 601
Dielectron analysis in p+p collisions at 1.58 GeV beam energy with HADES — •Karina Scharmann for the HADES collaboration — Justus-Liebig-Universität Gießen
In this contribution we present preliminary results on the dielectron production in p+p interactions at 1.58 GeV beam energy measured with the High Acceptance DiElectron Spectrometer (HADES). The HADES RICH detector has been upgraded with a new photon detection camera which strongly enhances the electron efficiency and conversion pair rejection. With this upgrade, a signal-to-background ratio above 1 is achieved over the entire dielectron spectrum. 0.5 billion collisions have been analyzed showing a contribution of π0 and η Dalitz decays in a signal up to an invariant mass of 600 MeV/c2. Furthermore, by analyzing elastic p+p collisions, a normalization procedure for differential cross sections has been established. Additionally, collisions with the empty target (target mounting) provide a p+Mylar spectrum and allow the extraction of a p+n reference spectrum.
The p+p and p+n dielectron spectra can serve as a baseline for the understanding and interpretation of Ag+Ag collisions which have been measured in HADES at the same energy. A precise understanding of the dielectron production in elementary reactions is needed to disentangle the various contributions to the measured dielectron yield in Ag+Ag collisions.
Keywords: Dielectrons; HADES; p+p collisions