Pre-equilibrium photons from the early stages of heavy-ion collisions
We use QCD kinetic theory to compute photon production in the chemically equilibrating Quark-Gluon Plasma created in the early stages of high-energy heavy-ion collisions. We do a detailed comparison of pre-equilibrium photon rates to the thermal photon production. We show that the photon spectrum ra...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
08 March 2024
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| In: |
Journal of high energy physics
Year: 2024, Issue: 3, Pages: 1-32 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP03(2024)053 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP03(2024)053
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| Author Notes: | Oscar Garcia-Montero, Aleksas Mazeliauskas, Philip Plaschke and Sören Schlichting |
| Summary: | We use QCD kinetic theory to compute photon production in the chemically equilibrating Quark-Gluon Plasma created in the early stages of high-energy heavy-ion collisions. We do a detailed comparison of pre-equilibrium photon rates to the thermal photon production. We show that the photon spectrum radiated from a hydrodynamic attractor evolution satisfies a simple scaling form in terms of the specific shear viscosity η/s and entropy density dS/dζ ∼ (Tτ1/3)3/2∞. We confirm the analytical predictions with numerical kinetic theory simulations. We use the extracted scaling function to compute the pre-equilibrium photon contribution in √s NN = 2.76 TeV 0–20% PbPb collisions. We demonstrate that our matching procedure allows for a smooth switching from pre-equilibrium kinetic to thermal hydrodynamic photon production. Finally, our publicly available implementation can be straightforwardly added to existing heavy ion models. |
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| Item Description: | Gesehen am 12.08.2024 |
| Physical Description: | Online Resource |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP03(2024)053 |