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.

arXiv commentv2: improved discussion about Ref.[23]; references added

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• Dilepton production and reaction dynamics in heavy-ion collisions at SIS energies from coarse-grained transport simulations
• Dilepton production in proton-induced reactions at SIS energies with the GiBUU transport model
• Inclusive dielectron spectra in p+p collisions at 3.5 GeV
• Dilepton production and resonance properties within a new hadronic transport approach in the context of the GSI-HADES experimental data
• System Size and Energy Dependence of Dilepton Production in Heavy-Ion Collisions at SIS Energies
• A versatile method for simulating pp -> ppe+e- and dp -> pne+e-p_spec reactions
• A coarse-graining approach for dilepton production at SPS energies
• Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV
• Photon and dilepton production at the Facility for Antiproton and Ion Research and the beam energy scan program at the Relativistic Heavy-Ion Collider using coarse-grained microscopic transport simulations
• Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy
• Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES
• Dimuon radiation at the CERN SPS within a (3+1)d hydrodynamic+cascade model
• Energy, centrality and momentum dependence of dielectron production at collider energies in a coarse-grained transport approach
• Dilepton production in p+p, Cu+Cu and Au+Au collisions at 200 AGeV
• Di-Electrons from Resonances in Nucleon-Nucleon Collisions
• Inclusive pion and eta production in p+Nb collisions at 3.5 GeV beam energy
• 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
• Inclusive Dielectron Production in Ar+KCl Collisions at 1.76 AGeV studied with HADES
• Phi meson production in In-In collisions at $E_{\mathrm{lab}}$=158$A$ GeV: evidence for relics of a thermal phase
• Non-equilibrium dilepton production in hadronic transport approaches
• Dilepton Production in Transport Calculations and Coarse-Grained Dynamics
• In-medium Spectral Functions in a Coarse-Graining Approach
• Future perspectives at SIS-100 with HADES-at-FAIR
• Low mass dimuons within a hybrid approach
• Vector Meson Spectral Functions in a Coarse-Graining Approach
• Electromagnetic probes in heavy-ion collisions: Messengers from the hot and dense phase