Volume 475 - FAIR next generation scientists - 8th Edition Workshop (FAIRness2024) - Main session
Dielectron analysis in p+p collisions at 1.58 GeV beam energy with HADES
K. Scharmann*  on behalf of the HADES collaboration
*: corresponding author
Full text: pdf
Published on: March 04, 2026
Abstract
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 identification efficiency and conversion pair rejection capability. 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 contributions of $\pi^0$ and $\eta$ Dalitz decays in the signal up to the invariant mass of 0.6 GeV/$c^2$. Furthermore, by analyzing elastic p+p collisions, a normalization procedure for the differential cross section has been established.

The cross section spectrum shows a satisfactory agreement with previous HADES measurements as well as with theoretical calculations from GiBUU. This spectrum 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 various contributions to the measured dielectron yield in Ag+Ag collisions.
DOI: https://doi.org/10.22323/1.475.0034
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