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

TL;DR

This paper models prompt and thermal photon production in gold-gold collisions across a range of energies, emphasizing how low-energy suppression of prompt photons can help measure thermal photons, shedding light on quark-gluon plasma properties.

Contribution

It provides detailed calculations of photon emission in heavy-ion collisions at various energies, highlighting the potential to study thermal photons at lower energies.

Findings

Prompt photon suppression at low energies facilitates thermal photon measurement.

Spacetime profile analysis of the plasma reveals electromagnetic emission characteristics.

Results suggest new ways to probe quark-gluon plasma properties at different collision energies.

Abstract

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.