Photon radiation from heavy-ion collisions in the $\sqrt{s_{NN}}=19-200$ GeV regime

Understand

We present calculations of prompt and thermal photon production in Au-Au collisions at $\sqrt{s_{NN}}=19-200$~GeV.

• We discuss features of the spacetime profile of the plasma relevant for electromagnetic emission.
• We highlight how the suppression of prompt photon production at low $\sqrt{s_{NN}}$ can provide a window to measure thermal photons in low collision energies.