---
_id: '50171'
abstract:
- lang: eng
  text: "We use QCD kinetic theory to compute photon production in the chemically\r\nequilibrating
    Quark-Gluon Plasma created in the early stages of high-energy\r\nheavy-ion collisions.
    We do a detailed comparison of pre-equilibrium photon\r\nrates to the thermal
    photon production. We show that the photon spectrum\r\nradiated from a hydrodynamic
    attractor evolution satisfies a simple scaling\r\nform in terms of the specific
    shear viscosity $\\eta/s$ and entropy density\r\n$dS/d\\zeta \\sim {\\scriptstyle
    \\left(T\\tau^{1/3}\\right)^{3/2}}_\\infty$. We\r\nconfirm the analytical predictions
    with numerical kinetic theory simulations.\r\nWe use the extracted scaling function
    to compute the pre-equilibrium photon\r\ncontribution in $\\sqrt{s_{NN}}=2.76\\,\\text{TeV}$
    0-20\\% PbPb collisions. We\r\ndemonstrate that our matching procedure allows
    for a smooth switching from\r\npre-equilibrium kinetic to thermal hydrodynamic
    photon production. Finally, our\r\npublicly available implementation can be straightforwardly
    added to existing\r\nheavy ion models."
author:
- first_name: Oscar Garcia-Montero
  full_name: Oscar Garcia-Montero, Oscar Garcia-Montero
  last_name: Oscar Garcia-Montero
- first_name: Aleksas
  full_name: Mazeliauskas, Aleksas
  last_name: Mazeliauskas
- first_name: Philip
  full_name: Plaschke, Philip
  last_name: Plaschke
- first_name: Sören
  full_name: Schlichting, Sören
  last_name: Schlichting
citation:
  ama: Oscar Garcia-Montero OG-M, Mazeliauskas A, Plaschke P, Schlichting S. Pre-equilibrium
    photons from the early stages of heavy-ion collisions. <i>arXiv:230809747</i>.
    Published online 2023.
  apa: Oscar Garcia-Montero, O. G.-M., Mazeliauskas, A., Plaschke, P., &#38; Schlichting,
    S. (2023). Pre-equilibrium photons from the early stages of heavy-ion collisions.
    In <i>arXiv:2308.09747</i>.
  bibtex: '@article{Oscar Garcia-Montero_Mazeliauskas_Plaschke_Schlichting_2023, title={Pre-equilibrium
    photons from the early stages of heavy-ion collisions}, journal={arXiv:2308.09747},
    author={Oscar Garcia-Montero, Oscar Garcia-Montero and Mazeliauskas, Aleksas and
    Plaschke, Philip and Schlichting, Sören}, year={2023} }'
  chicago: Oscar Garcia-Montero, Oscar Garcia-Montero, Aleksas Mazeliauskas, Philip
    Plaschke, and Sören Schlichting. “Pre-Equilibrium Photons from the Early Stages
    of Heavy-Ion Collisions.” <i>ArXiv:2308.09747</i>, 2023.
  ieee: O. G.-M. Oscar Garcia-Montero, A. Mazeliauskas, P. Plaschke, and S. Schlichting,
    “Pre-equilibrium photons from the early stages of heavy-ion collisions,” <i>arXiv:2308.09747</i>.
    2023.
  mla: Oscar Garcia-Montero, Oscar Garcia-Montero, et al. “Pre-Equilibrium Photons
    from the Early Stages of Heavy-Ion Collisions.” <i>ArXiv:2308.09747</i>, 2023.
  short: O.G.-M. Oscar Garcia-Montero, A. Mazeliauskas, P. Plaschke, S. Schlichting,
    ArXiv:2308.09747 (2023).
date_created: 2024-01-04T08:46:29Z
date_updated: 2024-03-08T15:58:55Z
external_id:
  arxiv:
  - '2308.09747'
language:
- iso: eng
project:
- _id: '52'
  name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: arXiv:2308.09747
status: public
title: Pre-equilibrium photons from the early stages of heavy-ion collisions
type: preprint
user_id: '16153'
year: '2023'
...