Calculations of direct photon emission in Heavy Ion Collisions at s_(NN)~(1/2)= 200 GeV

摘要

Abstract. Direct photon emission in heavy-ion collisions is calculated within a relativistic micro+macro hybrid model and compared to the microscopic transport model UrQMD. In the hybrid approach, the high-density part of the collision is calculated by an ideal 3+1-dimensional hydrodynamic calculation, while the early (pre-equilibrium-) and late (rescattering-) phase are calculated with the transport model. We study both models with Au + Au-collisions at s_(NN)~(1/2)= 200 GeV and compare the results to experimental data published by the PHENIX collaboration.