Calculations of direct photon emission in Heavy Ion Collisions at \sqrt{s_NN} = 200 GeV

TL;DR

This paper compares direct photon emission calculations in heavy-ion collisions using a hybrid hydrodynamic-transport model and a microscopic transport model, aligning results with experimental data at 200 GeV.

Contribution

It introduces a combined relativistic hybrid model for photon emission in heavy-ion collisions and compares its predictions with a microscopic transport model and experimental data.

Findings

Hybrid model reproduces experimental photon spectra.

Comparison shows differences between hydrodynamic and transport approaches.

Results enhance understanding of photon production mechanisms.

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 \sqrt{s_NN} = 200 GeV and compare the results to experimental data published by the PHENIX collaboration.