Cross sections for direct photon production in hadronic scattering processes have been calculated according to an effective chiral field theory following Turbide et al. For $\ \pi + \rho \rightarrow \pi + \gamma$ and $\ \pi + \pi \rightarrow \rho + \gamma$ processes, these cross sections have been implemented into a novel hadronic transport approach (SMASH), which is suitable for collisions at low and intermediate energies. Comparisons of the obtained thermal rates in infinite matter calculations to theoretical predictions and to the ones used in hydrodynamic calculations are shown. This constitutes a benchmark for future non-equilibrium calculations. Employing SMASH for the final state rescattering in a hybrid approach will allow to assess the importance of the hadronic stage in the generation of direct photon flow.
J. Weil et al, “Particle production and equilibrium properties within a new hadron transport approach for heavy-ion collisions”. In: Phys. Rev C 94 (2016) no. 5, 054905
Simon Turbide, Ralf Rapp, and Charles Gale. “Hadronic production of thermal photons”. In: Phys. Rev. C69 (2004), p. 014903
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