Direct photon emission from hadronic sources: Hydrodynamics vs. Transport theory

Details Direct photon emission from hadronic sources: Hydrodynamics vs. Transport theory Direct photon emission from hadronic sources: Hydrodynamics vs. Transport theory

2008-10-02

arxiv.org/abs/0810.0488v2

Eur.Phys.J.C62:75-80,2009

Physics

Nuclear Physics

Nuclear Theory

6 pages, 4 figures. Contribution to Hot Quarks 2008

Scientific paper

10.1140/epjc/s10052-009-0987-1

Direct photon emission in heavy-ion collisions is calculated within the relativistic microscopic transport model UrQMD. We compare the results from the pure transport calculation to a hybrid-model calculation, where the high-density part of the evolution is replaced by an ideal 3-dimensional fluiddynamic calculation. The effects of viscosity, present in the transport model but neglected in ideal fluid-dynamics, are examined. We study the contribution of different production channels and non-thermal collisions to the spectrum of direct photons. Detailed comparison to the measurements by the WA~98-collaboration are undertaken.

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