| Issue |
EPJ Web Conf.
Volume 274, 2022
XVth Quark Confinement and the Hadron Spectrum Conference (ConfXV)
|
|
|---|---|---|
| Article Number | 05002 | |
| Number of page(s) | 8 | |
| Section | 5 - Parallel Track D | |
| DOI | https://doi.org/10.1051/epjconf/202227405002 | |
| Published online | 22 December 2022 | |
https://doi.org/10.1051/epjconf/202227405002
Dielectron measurements with the HADES at GSI
Justus-Liebig University Giessen
e-mail: jan.h.otto@physik.uni-giessen.de
Published online: 22 December 2022
In this work we present the dielectron analysis of 4.5 billion Ag+Ag collisions ((0−40)% centrality) at a center-of-mass energy of √sNN = 2.55 GeV measured with HADES. The obtained dielectron signal spectrum is compared to simulated hadronic cocktail and nucleon-nucleon reference spectra revealing a strong contribution from the hot and dense phases. The average temperature of the collision system can be extracted from the slope of the in-medium contribution. In a momentum differential analysis we observe modifications of the dielectron signal shape in the ω−ρ invariant mass region. Furthermore we compare the results to previous measurements in Au+Au collisions at slightly lower energy. The suggested modifications of the ρ spectral function is further studied within the HADES pion-beam program. Here, we present recently published results on the electromagnetic and hadronic coupling of baryonic resonances to the ρ − N final state.
© The Authors, published by EDP Sciences, 2022
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