Production and evolution path of dileptons at HADES energies

Abstract

Dilepton production in intermediate energy nucleus-nucleus collisions as well as in elementary proton-proton reactions is analysed within the UrQMD transport model. For C+C collisions at 1 AGeV and 2 AGeV the resulting invariant mass spectra are compared to recent HADES data. We find that the experimental spectrum for C+C at 2 AGeV is slightly overestimated by the theoretical calculations in the region around the vector meson peak, but fairly described in the low mass region, where the data is satisfactorily saturated by the Dalitz decay of the $\eta$ meson and the $\Delta$ resonance. At 1 AGeV an underestimation of the experimental data is found, pointing that at lower energies the low mass region is not fully saturated by standardly parametrized $\Delta$ Dalitz decays alone. Furthermore, predictions for dilepton spectra for $pp$ reactions at 1.25 GeV, 2.2 GeV and 3.5 GeV and Ar+KCl reactions at 1.75 AGeV are presented. The study is complemented by a detailed investigation of the role of absorption of the parent particles on the corresponding dilepton yields in the regime which has so far been probed by HADES.

v2: improved discussion about Ref.[23]; references added

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• Dilepton production in p+p, Cu+Cu and Au+Au collisions at 200 AGeV
• Particle Production in AgAg Collisions at $E_{\mathrm{Kin}}=1.58A$ GeV within a Hadronic Transport Approach
• Dilepton production at SIS energies with the GiBUU transport model
• In-medium Spectral Functions in a Coarse-Graining Approach
• Future perspectives at SIS-100 with HADES-at-FAIR
• Vector Meson Spectral Functions in a Coarse-Graining Approach
• Electromagnetic probes in heavy-ion collisions: Messengers from the hot and dense phase
• Low mass dimuons within a hybrid approach