Dilepton Production in Transport Calculations and Coarse-Grained Dynamics

Abstract

We present transport calculations with the Ultra-relativistic Quantum Molecular Dynamics approach (UrQMD) for dilepton spectra at SIS energies. While we obtain a good agreement with experiment for elementary reactions, in heavy-ion collisions an excess in the invariant mass spectra is observed which cannot be described by the model. As the pure transport calculations do not include any in-medium effects and are limited to hadronic degrees of freedom, we present an alternative approach that uses coarse-grained output from transport calculations to determine thermal dilepton emission rates. For this we apply the medium-modified $\rho$ spectral function by Eletsky et al. In a first exemplary comparison to data from the NA60 experiment we find that the coarse-graining approach gives reasonable results.

5 pages, 3 figures; Contribution for FAIRNESS 2013 proceedings

References in corpus (23)

• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
• Transport-theoretical Description of Nuclear Reactions
• Properties of baryon resonances from a multichannel partial wave analysis
• Rho Meson Propagation and Dilepton Enhancement in Hot Hadronic Matter
• Dilepton Radiation at the CERN Super Proton Synchrotron
• Hadrons in strongly interacting matter
• An effective chiral Hadron-Quark Equation of State
• Dilepton production and off-shell transport dynamics at SIS energies
• NA60 results on thermal dimuons
• Dielectron production in Ar+KCl collisions at 1.76A GeV
• Properties of $\rho$ and $\omega$ Mesons at Finite Temperature and Density as Inferred from Experiment
• Dilepton production in proton-induced reactions at SIS energies with the GiBUU transport model
• Dileptons and Photons from Coarse-Grained Microscopic Dynamics and Hydrodynamics Compared to Experimental Data
• Production and evolution path of dileptons at HADES energies
• Remarks on Delta Radiative and Dalitz Decays
• Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy
• Dimuon radiation at the CERN SPS within a (3+1)d hydrodynamic+cascade model
• UrQMD-2.3 - Changes and Comparisons
• Reinterpretation of Thermal Dilepton Emission Rate by Spectral Functions
• Reaction dynamics in Pb+Pb at the CERN/SPS: from partonic degrees of freedom to freeze-out
• How Sensitive are Di-Leptons from Rho Mesons to the High Baryon Density Region?
• Dilepton production at SIS energies with the GiBUU transport model

Cited by in corpus (3)

• In-medium Spectral Functions in a Coarse-Graining Approach
• Electromagnetic probes in heavy-ion collisions: Messengers from the hot and dense phase
• Dilepton Production in Transport-based Approaches