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Electromagnetic (EM) radiation off strongly interacting matter created inhigh-energy heavy-ion collisions (HICs) encodes information on thehigh-temperature phases of nuclear matter. Microscopic calculations of thermalEM emission rates are usually rather involved and not readily accessible tobroad applications in models of the fireball evolution which are required tocompare to experimental data. An accurate and universal parametrization of themicroscopic calculations is thus key to honing the theory behind the EMspectra. Here we provide such a parametrization for photon emission rates fromhadronic matter, including the contributions from in-medium rho mesons (whichincorporate effects from anti-/baryons), as well as Bremsstrahlung from pi-piscattering. Individual parametrizations for each contribution are numericallydetermined through nested fitting functions for photon energies from 0.2 to 5GeV in chemically equilibrated matter of temperatures 100-180 MeV and baryonchemical potentials 0-400 MeV. Special care is taken to extent theparameterizations to chemical off-equilibrium as encountered in HICs afterchemical freezeout. This provides a functional description of thermal photonrates within a 20% variation of the microscopically calculated values.

Universal Parametrization of Thermal Photon Rates in Hadronic Matter