Dilepton production and $m_T$-scaling at BEVALAC/SIS energies

Abstract

We present a dynamical study of $e^{+}{e}^{-}$ production in C + C and Ca + Ca collisions at BEVALAC/SIS energies on the basis of the covariant transport approach HSD employing momentum-dependent $\rho$-meson spectral functions that include the pion modifications in the nuclear medium as well as the polarization of the $\rho$-meson due to resonant $\rho -N$ scattering. We find that the experimental data from the DLS collaboration cannot be described within the $\rho$-meson spectral function approach. A dropping $\eta$-mass scenario leads to a good reproduction of the DLS dilepton data, however, violates the $m_T$-scaling of ${\pi }^0$ and $\eta$ spectra as observed by the TAPS collaboration as well as $\eta$ photoproduction on nuclei.

35 pages, ReVTeX, including 11 postscript figures, UGI-97-06, Nucl. Phys. A, in press

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• Rho Meson Propagation and Dilepton Enhancement in Hot Hadronic Matter
• Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0 A GeV
• The Spectral Function of the Rho Meson in Nuclear Matter
• What QCD sum rules tell about the rho meson
• P-Wave Polarization of the $\rho$-Meson and the Dilepton Spectrum in Dense Matter
• Probing the Rho Spectral Function in Hot and Dense Nuclear Matter by Dileptons
• A Microscopic Calculation of Photoabsorption Cross Sections on Protons and Nuclei
• Medium effects in the production and decay of vector mesons in pion-nucleus reactions
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Cited by in corpus (40)

• Signatures of Quark-Gluon-Plasma formation in high energy heavy-ion collisions: A critical review
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• Hadrons in strongly interacting matter
• Influence of Impact Parameter on Thermal Description of Relativistic Heavy Ion Collisions at GSI/SIS
• Effective QCD and transport description of dilepton and photon production in heavy-ion collisions and elementary processes
• Dilepton production and off-shell transport dynamics at SIS energies
• Excitation functions of hadronic observables from SIS to RHIC energies
• Dilepton production in proton-induced reactions at SIS energies with the GiBUU transport model
• Dilepton production and reaction dynamics in heavy-ion collisions at SIS energies from coarse-grained transport simulations
• The $\rho$ Spectral Function in a Relativistic Resonance Model
• Dilepton production in heavy ion collisions at intermediate energies
• Role of baryonic resonances in the dilepton emission in nucleon-nucleon collisions
• System Size and Energy Dependence of Dilepton Production in Heavy-Ion Collisions at SIS Energies
• Low-mass dileptons and dropping rho meson mass
• Production and evolution path of dileptons at HADES energies
• Dilepton production in heavy-ion collisions with in-medium spectral functions of vector mesons
• 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
• Dilepton production in proton-proton and quasifree proton-neutron reactions at 1.25 GeV
• Perspectives of $e^{+}{e}^{-}$ production in pp, pd and p Be reactions at SIS energies
• e^+e^- production from pp reactions at BEVALAC energies
• $K^{-}/K^{+}$ ratio in heavy-ion collisions at GSI with an antikaon self-energy in hot and dense matter
• $e^{+}{e}^{-}$ pairs from ${\pi }^{-}$A reactions
• Energy, centrality and momentum dependence of dielectron production at collider energies in a coarse-grained transport approach
• The Vector Probe in Heavy-Ion Reactions
• In-medium vector meson properties and low-mass dilepton production from hot hadronic matter
• Dilepton production at HADES: theoretical predictions
• Electromagnetic Probes
• Relativistic quantum transport theory of hadronic matter: the coupled nucleon, delta and pion system
• Analysis of the exclusive final state npe${}^{+}$e${}^{-}$ in quasi-free np reaction
• Dilepton production in nucleon-nucleon collisions reexamined
• Dilepton and vector meson production in elementary and in heavy ion reactions
• Dielectron Production in C+C Collisions at 1 GeV/u and the Solution to the DLS Puzzle
• Dilepton production at SIS energies with the GiBUU transport model
• Dilepton production in elementary and in heavy ion reactions
• Probing dense and hot matter with low-mass dileptons and photons
• Dilepton production from SIS to LHC energies
• Vector Meson Spectral Functions in a Coarse-Graining Approach
• Covariant transport approach for strongly interacting partonic systems
• Dilepton production in nucleon-nucleon collisions around 1 GeV/nucleon: a theoretical update
• Dilepton production at SIS energies