TY  - CONF
A1  - Endres, Stephan
A1  - Hees, Hendrik van
A1  - Bleicher, Marcus
T1  - Studies of dilepton production in coarse-grained transport dynamics
T2  - Proceedings of Science
N2  - As microscopic transport models usually have difficulties to deal with in-medium effects in heavy-ion collisions, we present an alternative approach that uses coarse-grained output from transport calculations with the UrQMD model to determine thermal dilepton emission rates. A four-dimensional space-time grid is set up to extract local baryon and energy densities, respectively temperature and baryon chemical potential. The lepton pair emission is then calculated for each cell of the grid using thermal equilibrium rates. In the current investigation we inlcude the medium-modified r spectral function by Eletsky et al., as well as contributions from the QGP and four-pion interactions for high collision energies. First dielectron invariant mass spectra for Au+Au collisions at 1.25 AGeV and for dimuons from In+In at 158 AGeV are shown. At 1.25 AGeV a clear enhancement of the total dilepton yield as compared to a pure transport result is observed. In the latter case, we compare our outcome with the NA60 dimuon excess data. Here a good agreement is achieved, but the yield in the low-mass tail is underestimated. In general the results show that the coarse-graining approach gives reasonable results and can cover a broad collision-energy range.
Y1  - 2013
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/36533
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-365336
UR  - http://pos.sissa.it/archive/conferences/185/052/CPOD%202013_052.pdf
SN  - 1824-8039
N1  - (c) Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
N1  - 8th International Workshop on Critical Point and Onset of Deconfinement, March 11 to 15, 2013 Napa, California, USA
VL  - 2013
IS  - PoS(CPOD 2013)052
SP  - 1
EP  - 4
PB  - SISSA
CY  - Trieste
ER  -