Parametric estimate of the relative photon yields from the glasma and the quark-gluon plasma in heavy-ion collisions

• Verfasst von: Berges, Jürgen [VerfasserIn]
• Verfasst von: Reygers, Klaus [VerfasserIn]
• Verfasst von: Tanji, Naoto [VerfasserIn]
• Titel: Parametric estimate of the relative photon yields from the glasma and the quark-gluon plasma in heavy-ion collisions
• Verf.angabe: Jürgen Berges, Klaus Reygers, Naoto Tanji, Raju Venugopalan
• Fussnoten: Gesehen am 18.09.2017
• Titel Quelle: Enthalten in: Physical review
• Jahr Quelle: 2017
• Band/Heft Quelle: 95(2017,5) Artikel-Nummer 054904, 16 Seiten
• ISSN Quelle: 2469-9993
• DOI: doi:10.1103/PhysRevC.95.054904
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1563593491

Abstract

Recent classical-statistical numerical simulations have established the “bottom-up” thermalization scenario of Baier et al. [Phys. Lett. B 502, 51 (2001)] as the correct weak coupling effective theory for thermalization in ultrarelativistic heavy-ion collisions. We perform a parametric study of photon production in the various stages of this bottom-up framework to ascertain the relative contribution of the off-equilibrium “glasma” relative to that of a thermalized quark-gluon plasma. Taking into account the constraints imposed by the measured charged hadron multiplicities at Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), we find that glasma contributions are important especially for large values of the saturation scale at both energies. These nonequilibrium effects should therefore be taken into account in studies where weak coupling methods are employed to compute photon yields.