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 and simulations for NA60 within a coarse-graining approach. While the transport model obtains 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 explicit 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 ρ 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.
- Publication:
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Journal of Physics Conference Series
- Pub Date:
- April 2014
- DOI:
- 10.1088/1742-6596/503/1/012039
- arXiv:
- arXiv:1312.5606
- Bibcode:
- 2014JPhCS.503a2039E
- Keywords:
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- Nuclear Theory;
- High Energy Physics - Phenomenology
- E-Print:
- 5 pages, 3 figures