Analysis of Dilepton Invariant Mass Spectrum in C+C at 2 and 1 AGeV

Abstract

Recently the HADES collaboration has published the invariant mass spectrum of $e^{+}{e}^{-}$ pairs, dN/dM${}_{e^{+}{e}^{-}}$, produced in C+C collisions at 2 AGeV. Using electromagnetic probes, one hopes to get in this experiment information on hadron properties at high density and temperature. Simulations show that firm conclusions on possible in-medium modifications of meson properties will only be possible when the elementary meson production cross sections, especially in the pn channel, as well as production cross sections of baryonic resonances are better known. Presently one can conclude that a) simulations overpredict by far the cross section at $M_{e^{+}{e}^{-}}\approx M_{\omega }{}^0$ if free production cross sections are used and that b) the upper limit of the $\eta$ decay into $e^{+}{e}^{-}$ is smaller than the present upper limit of the Particle Data Group. This is the result of simulations using the Isospin Quantum Molecular Dynamics (IQMD) approach.

28 pages, 15 figures, 3 tables, ps file recommended

References in corpus (3)

• Dileptons and Medium Effects in Heavy-Ion Collisions
• Dilepton production in pp and CC collisions with HADES
• In-medium Hadrons - Properties, Interaction and Formation

Cited by in corpus (6)

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• Production and evolution path of dileptons at HADES energies
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• How Sensitive are Di-Leptons from Rho Mesons to the High Baryon Density Region?
• Particle Production in AgAg Collisions at $E_{\mathrm{Kin}}=1.58A$ GeV within a Hadronic Transport Approach
• Vector Meson Spectral Functions in a Coarse-Graining Approach