Electromagnetic radiation from the pre-equilibrium/pre-hydro stage of the quark-gluon plasma

Jessica Churchill; Li Yan; Sangyong Jeon; Charles Gale

doi:10.1016/j.nuclphysa.2020.121946

paper

Electromagnetic radiation from the pre-equilibrium/pre-hydro stage of the quark-gluon plasma

arXiv:2001.11110 · doi:10.1016/j.nuclphysa.2020.121946

Abstract

Photons produced in the pre-equilibrium/pre-hydro stage of the quark-gluon plasma produced in relativistic heavy-ion collisions were computed using parton distribution functions obtained from solutions of the Boltzmann equation. The effect of the initial gluon momentum anisotropy $ξ$ and the dependence on the saturation momentum $Q_{s}$ was investigated. We see that small $Q_{s}$ results in a photon yield enhancement, whereas a larger $Q_{s}$ results in a pre-equilibrium photon suppression, owing to the strict constraint of matching to experimental energy density.

4 pages, 2 figures, presented at Quark Matter 2019