Pre-equilibrium photons from the early stages of heavy-ion collisions

• Verfasst von: García-Montero, Oscar [VerfasserIn]
• Verfasst von: Mazeliauskas, Aleksas [VerfasserIn]
• Verfasst von: Plaschke, Philip [VerfasserIn]
• Verfasst von: Schlichting, Sören [VerfasserIn]
• Titel: Pre-equilibrium photons from the early stages of heavy-ion collisions
• Verf.angabe: Oscar Garcia-Montero, Aleksas Mazeliauskas, Philip Plaschke and Sören Schlichting
• E-Jahr: 2024
• Jahr: 08 March 2024
• Umfang: 32 S.
• Illustrationen: Illustrationen
• Fussnoten: Gesehen am 12.08.2024
• Titel Quelle: Enthalten in: Journal of high energy physics
• Ort Quelle: Berlin : Springer, 1997
• Jahr Quelle: 2024
• Band/Heft Quelle: (2024), 3, Artikel-ID 53, Seite 1-32
• ISSN Quelle: 1029-8479
• DOI: doi:10.1007/JHEP03(2024)053
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Quark-Gluon Plasma
• Sach-SW: Specific QCD Phenomenology
• K10plus-PPN: 1898407908

Abstract

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.