Direct photon emission from hadronic sources: hydrodynamics vs. transport theory

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 fluid-d...

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Bibliographic Details
Published in:European physical journal. C, Particles and fields (Print) Particles and fields (Print), 2009-07, Vol.62 (1), p.75-80
Main Authors: Bäuchle, Bjørn, Bleicher, Marcus
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Atomic collisions
Channels
Collisions
Computational fluid dynamics
Elementary Particles
Evolution
Exact sciences and technology
Fluid flow
Hadrons
Heavy Ions
Hydrodynamics
Ideal fluids
Ionic collisions
Mathematical models
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Photon emission
Photons
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
String Theory
The physics of elementary particles and fields
Three dimensional models
Transport
Transport theory
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Summary: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 fluid-dynamic 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 comparisons to the measurements by the WA 98 collaboration are undertaken.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-009-0987-1